LG LG570 Service Manual
CDMA Mobile Subscriber Unit
LG570
SERVICE MANUAL
TRI BAND, TRI MODE
[PCS/GPS/CELLULAR]
CDMA MOBILE PHONE
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Table of Contents
General Introduction
........................................................................................................................................ 3
CHAPTER 1. System Introduction
1. System Introduction......................................................................................................................4
2. Features and Advantages of CDMA Mobile Phone (For AMPS as well).................................5
3. Structure and Functions of dual-band CDMA Mobile Phone..................................................8
4. Specification...................................................................................................................................9
5. Installation .....................................................................................................................14
CHAPTER 2. NAM Input Method
1. NAM Program Method and Telephone Number Inputting Method ................................. 16
CHAPTER 3. Circuit Description
1. RF Transmitter/Receiver Part...................................................................................................20
2. Digital/Voice Processing Part.....................................................................................................26
CHAPTER 4. Safety……………………………………………………………………………..…..30
CHAPTER 5. Glossary…………………………………………………………………………..…..33
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General Introduction
The LG570 phone has been designed to operate on the latest digital mobile communication technology, Code
Division Multiple Access (CDMA). This CDMA digital technology has greatly enhanced voice clarity and can
provide a variety of advanced features. Currently, CDMA mobile communication technology has been
commercially used in Cellular and Personal Communication Service (PCS). The difference between them is the
operating frequency spectrum. Cellular uses 800Mhz and PCS uses 1.9Ghz. The LG570 support GPS Mode, we
usually call it tri-band phone.
The CDMA technology adopts DSSS (Direct Sequence Spread Spectrum). This feature of DSSS enables the
phone to keep communication from being crossed and to use one frequency channel by multiple users in the
same specific area, resulting that it increases the capacity 10 times more compared with that in the analog mode
currently used. Soft/Softer Handoff, Hard Handoff, and Dynamic RF power Control technologies are combined
into this phone to reduce the call being interrupted in a middle of talking over the phone.
Cellular and PCS CDMA network consists of MSO (Mobile Switching Office), BSC (Base Station Controller),
BTS (Base station Transmission System), and MS (Mobile Station). The following table lists some major
CDMA Standards.
CDMA Standard Designator Description
Basic air interface TIA/EIA/IS-95-A/B/C
ANSI J-STD-008
Network TIA/EIA/IS-634
TIA/EIA/IS/651
TIA/EIA/IS-41-C
TIA/EIA/IS-124
Service TIA/EIA/IS-96-B
TIA/EIA/IS-99
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TIA/EIA/IS-637
TIA/EIA/IS-657
Performance TIA/EIA/IS-97
TIA/EIA/IS-98
ANSI J-STD-018
Protocol between MS and BTS for Cellular & AMPS
Protocol between MS and BTS for PCS
MAS-BS
PCSC-RS
Intersystem operations
Nom-signaling data comm.
Speech CODEC
Assign data and fax
Short message service
Packet data
Cellular base station
Cellular mobile station
PCS personal station
* TSB –74: Protocol between an IS-95A system and ANSI J-STD-008
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ANSI J-STD-019
TIA/EIA/IS-125
PCS base station
Speech CODEC
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Chapter 1. System Introduction
1. System Introduction
1.1 CDMA Abstract
The CDMA mobile communication system has a channel hand-off function that is used for collecting the
information on the locations and movements of mobile telephones from the cell site by automatically controlling
several cell site through the setup of data transmission routes, and then enabling one switching system to carry
out the automatic remote adjustment. This is to maintain continuously the call state through the automatic
location confirmation and automatic radio channel conversion when the busy subscriber moves from the service
area of one cell site to that of another by using automatic location confirmation and automatic radio channel
conversion functions. The call state can be maintained continuously by the information exchange between
switching systems when the busy subscriber moves from one cellular system area to the other cellular system
area.
In the cellular system, the cell site is a small-sized low output type and utilizes a frequency allocation system
that considers mutual interference, in an effort to enable the re-use of corresponding frequency from a cell site
separated more than a certain distance. The analog cellular systems are classified further into an AMPS system,
E-AMPS System, NMT system, ETACS system, and JTACS system depending on technologies used.
Unlike the time division multiple access (TDMA) or frequency division multiple access (FDMA) used in the
band limited environment, the Code Division Multiple Access (CDMA) system which is one of digital cellular
systems is a multi-access technology under the interference limited environment. It can process more number of
subscribers compared to other systems (TDMA system has the processing capacity three times greater than the
existing FDMA system whereas CDMA system, about 12~15 times of that of the existing system).
CDMA system can be explained as follows; TDMA or CDMA can be used to enable each person to talk
alternately or provide a separate room for each person when two persons desire to talk with each other at the
same time, whereas FDMA can be used to enable one person to talk in soprano, whereas the other in bass (one
of the two talkers can carry out synchronization for hearing in case there is a bandpass filter function in the area
of the hearer). Another available method is to make two persons to sing in different languages at the same time,
space, and frequency when wishing to let the audience hear the singing without being confused. This is the
characteristic of CDMA.
On the other hand, when employing the CDMA technology, each signal has a different pseudo-random binary
sequence used to spread the spectrum of carrier. A great number of CDMA signals share the same frequency
spectrum. In the perspective of frequency area or time area, several CDMA signals are overlapped. Among these
types of signals, only desired signal energy is selected and received through the use of pre-determined binary
sequence; desired signals can be separated, and then received with the correlator used for recovering the
spectrum into its original state. At this time, the spectrums of other signals that have different codes are not
recovered into its original state, and appears as the self-interference of the system.
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2. Features and Advantages of CDMA Mobile Phone
2.1 Various Types of Diversities
When employing the narrow band modulation (30kHz band) that is the same as the analog FM modulation
system used in the existing cellular system, the multi-paths of radio waves create a serious fad ing. However, in
the CDMA broadband modulation (1.25MHz band), three types of diversities (time, frequency, and space) are
used to reduce serious fading problems generated from radio channels in order to obtain high-quality calls.
Time diversity can be obtained through the use of code interleaving and error correction code whereas frequency
diversity can be obtained by spreading signal energy to wider frequency band. The fading related to normal
frequency can affect the normal 200~300kHz among signal bands and accordingly, serious effect can be avoided.
Moreover, space diversity (also called path diversity) can be realized with the following three types of methods.
First, it can be obtained by the duplication of cell site receive antenna. Second, it can be obtained through the
use of multi-signal processing device that receives a transmit signal having each different transmission delay
time and then, combines them. Third, it can be obtained through the multiple cell site connection (Soft Handoff)
that connects the mobile station with more than two cell sites at the same time.
2.2 Power Control
The CDMA system utilizes the forward (from a base station to mobile stations) and backward (from the mobile
station to the base station) power control in or der to in crease the call p ro cessing capacity an d ob tain h igh -q uality
calls. In case the originating signals of mobile stations are received by the cell site in the minimum call quality
level (signal to interference) through the use of transmit power control on all the mobile stations, the system
capacity can be maximized.If the signal power of mobile station is received too strong, the performance of that
mobile station is improved. However, because of this, the interference on other mobile stations using the same
channel is increased and accordingly, the call quality of other subscribers is reduced unless the maximum
accommodation capacity is reduced.
In the CDMA system, forward power control, backward open loop power control, and closed loop power control
methods are used. The forward power control is carried out in the cell site to reduce the transmit power on
mobile stations less affected by the multi-path fading and shadow phenomenon and the interference of other cell
sites when the mobile station is not engaged in the call or is relatively nearer to the corresponding cell site. This
is also used to provide additional power to mobile stations having high call error rates, located in bad reception
areas or far away from the cell site.
The backward open loop power control is carried out in a corresponding mobile station; the mobile station
measures power received from the cell site and then, reversely increases/decreases transmit power in order to
compensate channel changes caused by the forward link path loss and terrain characteristics in relatio n to the
mobile station in the cell site. By doing so, all the mobile transmit signals received by the base station have same
strength.
Moreover, the backward closed loop power control used by the mobile station is performed to control power
using the commands issued out by the cell site. The cell site receives the signal of each corresponding mobile
station and compares this with the pre-set threshold value and then, issues out power increase/decrease
commands to the corresponding mobile station every 1.25msec (800 times per second). By doing so, the gain
tolerance and the different radio propagation loss on the forward/backward link are complemented.
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2.3 Voice Encoder and Variable Data Speed
The bi-directional voice service having variable data speed provides voice communication which employs
voice encoder algorithm having power variable data rate between the base station and the mobile station. On the
other hand, the transmit voice encoder performs voice sampling and then, creates encoded voice packets to be
sent out to the receive voice encoder, whereas the receive voice encoder demodulates the received voice packets
into voice samples.
One of the two voice encoders described in the above is selected for use depending on inputted automatic
conditions and message/data; both of them utilize four-stage frames of 9600, 4800, 2400, and 1200 bits per
second for cellular and 14400,7200,3600,1800 bits per second for PCS, so PCS provide relatively better voice
quality (almost twice better than the existing celluar system). In addition, this type of v ariable voice encoder
utilizes adaptive threshold values on selecting required data rate. It is adjusted in accordance with the size of
background noise and the data rate is increased to high rate only when the voice of caller is inputted.
Therefore, background noise is suppressed and high-quality voice transmission is possible under the
environment experiencing serious noise. In addition, in case the caller does not talk, data transmission rate is
reduced so that the transmission is carried out in low energy. This will reduce the interference on other CDMA
signals and as a result, improve system performance (capacity increased by about two times).
2.4 Protecting Call Confidentiality
Voice privercy is provided in the CDMA system by means of the private long code mask used for PN spreading.
Voice privacy can ve applied on the traffic channels only. All calls are initiated using the public long code mask
for PN spreading. The mobile station user may request voice privacy during call setup using the origination
message or page response message, and during traffic channel operation using the long code transition request
order.
The Transition to private long code mask will not be performed if authentication is not performed. To initiate a
transition to the private or public long code mask, either the base station or the mobile station sends a long code
transition request order on the traffic channel.
2.5 Soft Handoff
A handoff in which the mobile station commences communications with a new base station without interrupting
communications with the old base station. Soft handoff can only be used between CDMA channels having
identical freqeuncy assignments.
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2.6 Frequency Re-Use and Sector Segmentation
Unlike the existing analog cellular system, the CDMA system can reuse the same frequency at the adjacent cell.
there is no need to prepare a separate frequency plan. Total interference generated on mobile station signals
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received from the cell site is the sum of interference generated from other mobile stations in the same cell site
and interference generated from the mobile station of adjacent cell site. That is, each mobile station signal
generates interference in relation to the signals of all the other mobile stations.
Total interference from all the adjacent cell sites is the ratio of interference from all the cell sites versus total
interference from other mobile stations in the same cell site (about 65%). In the case of directional cell site, one
cell normally uses a 120°sector antenna in order to divide the sector into three. In this case, each antenna is
used only for 1/3 of mobile stations in the cell site and accordingly, interference is reduced by 1/3 on the average
and the capacity that can be supported by the entire system is increased by three times.
2.7 Soft Capacity
The subscriber capacity of the CDMA system is flexible depending on the relation between the number of
users and service classes. For example, the system operator can increase the number of channels available for
use during the busy hour despite the drop in call quality. This type of function requires 40% of normal call
channels in the standby mode during the handoff, in an effort to avoid call disconnection resulting from the lack
of channels.
In addition, in the CDMA system, services and service charges are classified further into different classes so that
more transmit power can be allocated to high class service users for easier call set-up; they can also be given
higher priority of using hand-off function than the general users.
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3. Structure and Functions of tri-band CDMA Mobile Phone
The hardware structure of CDMA mobile phone is made up of radio frequency (RF) part and logic part. The
RF part is composed of Receiver part (Rx), Transmitter part (Tx) and Local part (LO). For the purpose of
operating on tri-band, It is necessary dual Tx path, tri Rx path, dual PLL and switching system for band
selection. The mobile phone antenna is connected with the frequency seperater which divide antenna
input/output signals between cellular frequency band (824~894 Mhz) and PCS frequency band
(1850~1990Mhz). Each separated path is linked with the cellular duplexer and PCS duplexer. Duplexer carrys
out seperating Rx band and Tx band. The Rx signals from the antenna are converted into intermediate
frequency(IF) band by the frequency synthesizer and frequency down converter. And then, pass SAW filter
which is a band pass filter for removing out image frequency. The IF output signals that have been filtered is
converted into digital signals via Analog-to-Digital Converter (ADC). In front of the ADC, switching system is
required to choose which band path should be open. The digital signals send to 5 correlators in each CDMA
de-modulator. Of these, one is called a searcher whereas the remaining 4 are called data receivers (fingers).
Digitalized IF signals include a great number of call signals that have been sent out by the adjacent cells. These
signals are detected with pseudo-noise sequence (PN Sequence). Signal to interference ratio (C/I) on signals that
match the desired PN sequence are increased through this type of correlation detection process, but other signals
obtain processing gain by not increasing the ratio. The carrier wave of pilot channel from the cell site most
adjacently located is demodulated in order to obtain the sequence of encoded data symbols. During the operation
with one cell site, the searcher searches out multi-paths in accordance with terrain and building reflections. On
three data receivers, the most powerful 3 paths are allocated for the parallel tracing and receiving. Fading
resistance can be improved a great deal by obtaining the diversity combined output for de-modulation. Moreover,
the searcher can be used to determine the most powerful path from the cell sites even during the so ft handoff
between the two cell sites. Moreover, 3 data receivers are allocated in order to carry out the de-modulation of
these paths. Output data that has been demodulated changes the data string in the combined data row as in the
case of original signals(deinterleaving), and then, are demodulated by the forward error correction decoder
which uses the Viterbi algorithm.
Mobile station user information send out from the mobile station to the cell site pass through the digital voice
encoder via a mike. Then, they are encoded and forward errors are corrected through the use of convolution
encoder. Then, the order of code rows is changed in accordance with a certain regulation in order to remove any
errors in the interleaver. Symbols made through the above process are spread after being loaded onto PN carrier
waves. At this time, PN sequence is selected by each address designated in each call.
Signals that have been code spread as above are digital modulated (QPSK) and then, power controlled at the
automatic gain control amplifier (AGC Amp). Then, they are converted into RF band by the frequency
synthesizer synchronizing these signals to proper output frequencies.
Transmit signals obtained pass through the duplexer filter and then, are sent out to the cell site via the antenna.
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4. Specification
4.1 General Specification
4.1.1 Transmit/Receive Frequency Interval :
1) CELLULAR : 45 MHz
2) PCS : 80 MHz
4.1.2 Number of Channels (Channel Bandwidth)
1) CELLULAR : 20 Channels
2) PCS : 48 Channels
4.1.3 Operating Voltage : DC 3.3~4.2V
4.1.4 Battery Power Consumption : DC 3.7V
SLEEP IDLE MAX POWER
CELLULAR
PCS
1.0 mA 200mA 800 mA (24.5 dBm)
1.0 mA 200mA 800 mA (24.5 dBm)
4.1.5 Operating Temperature : -20°C ~ +60°C
4.1.6 Frequency Stability
1) CDMA : ±0.5PPM
2) PCS : ±0.1PPM
4.1.7 Antenna : Internal Antenna, 50 Ω
4.1.8 Size and Weight
1) Size : 15.4(H) x 49.5(W) x 96.5(D) mm (with800mAh)
2) Weight : 88g (with 800mAh)
4.1.9 Channel Spacing
1) CELLULAR : 1.25MHz
2) PCS: 1.25 MHz
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4.1.10 Battery Type, Capacity and Orerating Time.
Unit = Hours, Minutes
Standard (800mAh)
PCS(Slot Cycle 2)
Standby Time
DCN (Slot Cycle 2)
PCS(Slot Cycle 2)
Talk Time
DCN (Slot Cycle 2)
4.2 Receive Specification
4.2.1 Frequency Range
1) CELLULAR : 869.820 MHz ~ 893.190 MHz
2) PCS : 1930 MHz ~ 1990 MHz
3) GPS : 1575.42 MHz
4.2.2 Local Oscillating Frequency Range :
1) CELLULAR : 1738.08MHz ~ 1787.94MHz
2) PCS : 1715.56MHz ∼ 1768.89MHz
3) GPS : 3150.84MHz
4.2.3 Sensitivity
About 130 Hrs (SCI=2)
About 130 Hrs (SCI=2)
190 Min.(typical duplexer,10dBm output)
172Min.(typical duplexer,10dBm output)
1) CELLULAR : -104dBm (C/N 12dB or more)
2) PCS : -104dBm (C/N 12dB or more)
3) GPS : -148.5dBm
4.2.4 Selectivity
1) CELLULAR : 3dB C/N Degration (With Fch±1.25 kHz : -30dBm)
2) PCS : 3dB C/N Degration (With Fch±1.25 kHz : -30dBm)
4.2.5 Interference Rejection
1) Single Tone : -30dBm at 900 kHz (CELLULAR), -30dBm at 1.25MHz(PCS)
2) Two Tone : -43dBm at 900 kHz & 1700kHz(CELLULAR), -43dBm at 1.25 MHz & 2.05 MHz
4.2.6 Spurious Wave Suppression : Maximum of -80dB
4.2.7 CDMA Input Signal Range
z Dynamic area of more than -104~ -25 dB: 79dB at the 1.23MHz band.
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4.3 Transmit Specification
4.3.1 Frequency Range
1) CELLULAR : 824.820MHz ~ 848.190MHz
2) PCS : 1850 MHz ~ 1910 MHz
4.3.2 Output Power
1) CELLULAR : 0.236W
2) PCS: 0.251W
4.3.3 CDMA TX Frequency Deviation :
1) CELLULAR: +300Hz or less
2) PCS: ± 150Hz
4.3.4 CDMA TX Conducted Spurious Emissions
1) CELLULAR : 900kHz : - 42 dBc/30kHz below
1.98MHz : - 54 dBc/30kHz below
2) PCS : -42 dBc / 30KHz below
4.3.5 CDMA Minimum TX Power Control
1) CELLULAR : - 50dBm below
2) PCS: -50dBm below
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4.4
MS (Mobile Station) Transmitter Frequency
4.4.1 CELLULAR mode
Ch # Center Freq. (MHz) Ch # Center Freq. (MHz)
1011
29
70
111
152
193
234
275
316
363
4.4.2 PCS mode
Ch # Center Freq (MHz) Ch # Center Freq (MHz) Ch # Center Freq (MHz)
25 1851.25 425 1871.25 825 1891.25
50 1852.50 450 1872.50 850 1892.50
75 1853.75 475 1873.75 875 1893.75
824.640
825.870
827.100
828.330
829.560
830.790
832.020
833.250
834.480
835.890
404
445
486
527
568
609
650
697
738
779
837.120
838.350
839.580
840.810
842.040
843.270
844.500
845.910
847.140
848.370
100 1855.00 500 1875.00 900 1895.00
125 1856.25 525 1876.25 925 1896.25
150 1857.50 550 1877.50 950 1897.50
175 1858.75 575 1878.75 975 1898.75
200 1860.00 600 1880.00 1000 1900.00
225 1861.25 625 1881.25 1025 1901.25
250 1862.50 650 1882.50 1050 1902.50
275 1863.75 675 1883.75 1075 1903.75
300 1865.00 700 1885.00 1100 1905.00
325 1866.25 725 1886.25 1125 1906.25
350 1867.50 750 1887.50 1150 1907.50
375 1868.75 775 1888.75 1175 1908.75
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4.5
MS (Mobile Station) Receiver Frequency
4.5.1 CELLULAR mode
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Ch. # Center Freq. (MHz) Ch. # Center Freq. (MHz)
1011
29
70
111
152
193
234
275
316
363
4.5.2 PCS mode
Ch # Center Freq (MHz) Ch # Center Freq (MHz) Ch # Center Freq (MHz)
25 1931.25 425 1951.25 825 1971.25
50 1932.50 450 1952.50 850 1972.50
75 1933.75 475 1953.75 875 1973.75
869.640
870.870
872.100
873.330
874.560
875.790
877.020
878.250
879.480
880.890
404
445
486
527
568
609
650
697
738
779
882.120
883.350
884.580
885.810
887.040
888.270
889.500
890.910
892.140
893.370
100 1935.00 500 1955.00 900 1975.00
125 1936.25 525 1956.25 925 1976.25
150 1937.50 550 1957.50 950 1977.50
175 1938.75 575 1958.75 975 1978.75
200 1940.00 600 1960.00 1000 1980.00
225 1941.25 625 1961.25 1025 1981.25
250 1942.50 650 1962.50 1050 1982.50
275 1943.75 675 1963.75 1075 1983.75
300 1945.00 700 1965.00 1100 1985.00
325 1946.25 725 1966.25 1125 1986.25
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350 1947.50 750 1967.50 1150 1987.50
375 1948.75 775 1968.75 1175 1988.75
4.5.3 GPS mode : 1575.42MHz
4.6 AC Adaptor : See Appendix
4.7 Cigar Lighter Charger: See Appendix
4.8 Hands-Free Kit : See Appendix
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5. Installation
5.1 Installing a Battery Pack
1) The Battery pack is keyed so it can only fit one way. Align the groove in the battery pack with the rail on the
back of the phone until the battery pack rests flush with the back of the phone.
2) Slide the battery pack forward until you hear a “click”, which locks the battery in place.
5.2 For Adapter Use
1) Plug the adapter into a wall outlet. The adapter can be operated from a 110V source. When AC power is
connected to the adapter.
2) Insert the adapter jack into the phone with the installed battery pack.
Red light indicates battery is being charged.. Green light indicates battry is fully charged.
5.3 For Mobile Mount
5.3.1 Installation Position
In order to reduce echo sound when using the Hands-Free Kit, make sure that the speaker and microphone are
not facing each other and keep microphone a generous distance from the speaker.
5.3.2 Cradle Installation
Choose an appropriate flat surface where the unit will not interface with driver’s movement or passenger’s
comfort. The driver/user should be able to access the phone with ease. Using the four self-tapping screws
provided, mount the supplied braket on the selected area. Then with the four machine screws provided, mount
the counterpart on the reverse side of the reverse side of the cradle. Secure the two brackets firmly together by
using the two bracket joint screws provide. The distance between the cradle and the interface box must not
exceed the length of the main cable.
5.3.3 Interface Box
Choose an appropriate flat surface ( somewhere under the dash on the passenger side is preferred ) and mount
the IB bracket with the four self-tapping screws provided. Clip the IB into the IB bracket.
5.3.4. Microphone Installation
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Install the microphone either by cliiping I onto the sunvisor (driver’s side) or by attaching it to door post
(driver’s side), using a velcno adhesive tape (not included).
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5.3.5 Cable Connections
5.3.5.1 Power and Ignition Cables
Connect the red wire to the car battery positive terminal and the black wire to the car ground. Connect the green
wire to the car ignition sensor terminal. Connect the kit’s power cable connector to the interface box power
receptacle.
5.3.5.2 Antenna Cable Connection
Connect the antenna coupler cable connector from the cradle to the external antenna connector. ( Antenna is not
included.)
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CHAPTER 2. NAM Input Method
(Inputting of telephone numbers included)
1. NAM Programming Method and Telephone Number Input Method
1. Press ##2342# (##CDG2#)
2. Enter Service Code “ 000000” .
3. You can see following Menu
CDG-II
1. Service Progra..
2. Field Tests
3. Vocoder Select
4. Reg. Tests
5. Data Setting
4. Select ‘ Service Prog’ , and press OK
You can see following submenus.
Service Program
1. Reset Phone
2. Mobile Phone #
3. Home SID
4. Advanced
4-1) Select ‘ Reset Phone’ , and Press OK
You can reset the phone
4-2) Select ‘ Mobile Phone #’ and press OK
Input Mobile Phone Number and select OK
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Phone Number
0000000000
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4-3) Select ‘ Home SID’ and press OK
Input the Home SID and select OK
Home SID
11111
4-4) Advanced
There are fifteen submenus as below.
4-4.1) Select ‘ MCC’ and press OK
Input the Mobile Country Code and select OK
Country Code
000
4-4.2)Select ‘ NMSI’ and press OK
Input the NMSI and select OK
NMSI
001112223333
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4-4.3)Select ‘ True MCC’ and press OK
Input the True MCC and select OK
True MCC
310
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4-4.4) Select ‘ True IMSI NMSI’ and press OK
Input the True IMSI NMSI and select OK
True IMSI NMSI
001112223333
4-4.5) Select ‘ Home NID’ and press OK
Input the Home NID and select OK
Home NID
65535
4-4.6) Select ‘ Home Sys Reg’ and press OK
Select one what you want , and press OK
Home Sys Reg
◉ Yes
◌ No
4-4.7) Select ‘ Forn SID Reg’ and press OK
Select one what you want , and press OK
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Forn SID Reg
◉ Yes
◌ No
4-4.8) Select ‘ Forn NID Reg’ and press OK
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Select one what you want , and press OK
Forn NID Reg
◉ Yes
◌ No
4-4.9) Select ‘ CDMA Preferred CH’ and press OK
Select one what you want , and press OK
4-4.10) Select ‘ Slot Cycle Idx’ and press OK
Input the Slot Cycle and select OK
CDMAPreferCH
1. System A
2. System B
Slot Cycle
1
4-4.11) Select ‘ Acc Ovld Class’ and press OK
You can see the Access Overload Class that is automatically set according
to IMSI_M
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Acc Ovld Class
0
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CHAPTER 3. Circuit Description
1. RF Transmit/Receive Part
1.1 Overview
The Tx and Rx part employs the Direct Conversion system. The Tx and Rx frequencies are respectively
824.04~848.97 and 869.04~893.97 for cellular and 1850~1910 and 1930~1990 for PCS. The block diagram is
shown in [Figure 1-1]. RF signals received through the antenna are seperated by Triplexer.
RF Signal fed into the low noise amplifier (LNA) which is embedded in RFR6500 through the duplexer. Then,
they are into baseband signal directly. Then, this sign al is changed into digital signal by the analog to digital
converter (ADC, A/D Converter), and the digital circuit part of the MSM(Mobile Station Modem)6500
processes the data from ADC. The digital processing part is a demodulator.
In the case of transmission, RFT6150 receives OQPSK-modulated anlog signal from the MSM6500.
The RFT6150 connects directly with MSM6500 using an analog baseband interface. In RFT6150, the baseband
quadrature signals are upconverted to the Cellular or PCS frequency bands and amplified to provide signal drive
capability to the power amp.
After that, the RF signal is amplified by the Power Amp in order to have enough power for radiation. Finally,
the RF signal is sent out to the cell site via the antenna after going through the isolator and duplexer.
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[Figure 1-1] Block Diagram Of LG570
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1.2 Description of Rx Part Circuit
1.2.1 Quintiplexer(DP1000)
The Quintplexer combines PCS, and Cellular duplexer functions with a GPS filter. Each duplexer consists of
the Rx bandpass filter (BPF) and the Tx BPF which has the function of separating Tx and Rx signals in the full
duplex system for using the common antenna. The Tx part BPF is used to suppress noises and spurious out of
the Tx frequency band. The Rx BPF is used to receive only Rx signal coming from the antenna, which is usually
called preselector. It’s main function is to limit the bandwidth of spectrum reaching the LNA and mixer,
attenuate receiver spurious response and suppress local oscillator energy. As a result frequency sensitivity and
selectivity of mobile phone increase. The specification of LG570 quintplexer is described below ;
z PCS Duplexer
Pass Band
Insertion Loss
Return Loss
Attenuation
z Cellular Duplexer
Pass Band
Insertion Loss
Return Loss
Attenuation
z GPS Filter
Tx Rx Tx to Rx (min)
1850~1910 MHz 1930~1990 MHz
3.0dB max 3.2dB max
9.5dB min 12dB min
45dB min (1930~1990MHz) 55dB min
(1850~1910MHz)
Tx Rx Tx to Rx (min)
824~849MHz 869~894 MHz
2.0dB max 2.5dB max
12dB min 12dB min
48dB min (869~894MHz) 60dB min (824~849MHz) 60dB (824~849MHz)
60dB (1850~1910MHz)
50dB (1930~1990MHz)
50dB (869~894MHz)
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Insertion Loss
Return Loss
ISOLATION
1.2.3 LNAs (U1008)
The RFR6500 has cellular and PCS LNAs, respectively. The characteristics of Low Noise Amplifier (LNA)
are low noise figure, high gain, high intercept point and high reverse isolation. The frequency selectivity
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MAX. TYP. MIN. UNIT
2.0 dB
9 dB
40 ~ 46 dB
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characteristic of mobile phone is mostly determined by LNA.
The specification of LG570 LNAs are described below.
● Cellular
High current mode Low current mode Passive status
Power Gain
*Gain mode G0(G2)
*Gain mode G1(G3)
Noise Figure
Gain mode G0(G2)
Gain mode G1(G3)
Input IP3
Gain mode G0(G2)
Gain mode G1(G3)
*Gain mode G0 and G1 operate in high and low current mode.
*Gain mode G2 and G3 operate in Passive status.
● PCS
High current mode Low current mode Passive status
16dB
4.0dB
1.4dB
4.0dB
8dB
5dB
14dB
3.0dB
1.4dB
4.0dB
-5dB
-5dB
-6.0dB
-20.0dB
7.0dB
20.0dB
12dB
10dB
Power Gain
*Gain mode G0(G1)
Gain mode G2
Noise Figure
Gain mode G0(G1)
Gain mode G2
Input IP3
Gain mode G0(G1)
16dB
X
1.6dB
X
6dB
14dB
X
1.6dB
X
-2dB
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Gain mode G2
*Gain mode G0 operate in high and low current mode.
*Gain mode G1 and G2 operate in Passive status.
● GPS
Parameter GPS Band Unit
Gain 14.5 dB
Noise Figure 1.3 dB
X
X
-3.0dB
-20.0dB
4.0dB
20.0dB
10dB
10dB
IIP3 5.0 dBm
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1.2.4 Down-converter Mixers
The RFR6500 device performs signal down-conversion for Cellular, PCS and GPS tri-band applications. It
contains all the circuitry (with the exception of external filters) needed to support conversion of received RF
signals to baseband signals. It consists of the three downconverting Mixers(Cellular, PCS and GPS), and an RX
VCO and RX PLL circuit.
The GPS LNA & mixers offer the most advanced and integrated CDMA Rx solution designed to meet
cascaded Noise Figure (NF) and Third-order Intercept Point (IIP3) requirements of IS-98C and J-STD-018
specifications for Sensitivity, Two-Tone Intermodulation, and Single-tone Desense.
Operation modes and band selection are specially controlled from the Mobile Station Modem MSM6500.
The specification of LG570 Mixers are described below:
● Cellular
High current mode Mid current mode Low current mode
Noise Figure
High Gain mode
Low Gain mode
Input IP3
High Gain mode
Low Gain mode
Input IP2
High Gain mode
Low Gain mode
● Cellular
Noise Figure
10dB
25dB
4.0dB
-5.0dB
56dB
30dB
High current mode Mid current mode Low current mode
10dB
25dB
4.0dB
-5.0dB
56dB
30dB
9dB
25dB
-10.0dB
-5.0dB
40dB
30dB
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High Gain mode
Low Gain mode
Input IP3
High Gain mode
Low Gain mode
Input IP2
High Gain mode
Low Gain mode
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10dB
25dB
4.0dB
-11.0dB
56dB
30dB
10dB
25dB
-8.0dB
-11.0dB
56dB
30dB
9dB
25dB
-8.0dB
-11.0dB
40dB
30dB
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1.2.4 Rx RF SAW FILTER(F1000,F1001,F1002)
The main function of Rx RF SAW filter is to attenuate mobile phone spurious frequency, attenuate direct RF
frequency pick up, attenuate noise at the image frequency originating in or amplified by the LNA and suppress
second harmonic originating in the LNA. The Rx RF SAW filter usually called image filter.
1.3 Description of Transmit Part Circuit
1.3.1 RFT6150 (U1009)
The RFT6150 base-band-to-RF Transmit Processor performs all Tx signal-processing functions required
between digital base-band and the Power Amplifier Modulator (PAM). The base-band quadrature signals are
up-converted to the Cellular or PCS frequency bands and amplified to provide signal drive capability to the
PAM. The RFT6150 includes an RF mixer for upconverting analog baseband to RF, a programmable PLL for
generating Tx LO frequency, two cellular and two PCS driver amplifiers and Tx power control through an 85
dB VGA. As added benefit, the single sideband upconversion eliminates the need for a band pass filter normally
required between the upconverter and driver amplifier.
I, I/, Q and Q/ signals proceed from the MSM6500 to RFT6150 are analog signal. In CDMA mode, These
signals are modulated by Quadrature Phase Shift King (QPSK). I and Q are 90 deg. out of phase, and I and I/ are
180 deg. The mixer in RFT6150 converts baseband signals into RF signals. After passing through the
upconverter , RF signal is inputted into the Power AMP.
z RFT6150 Cellular and PCS CDMA RF Specifications
Condition Min. Typ. Max. Units
Rated Output Power
Min Output Power
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Rx band noise power
ACPR
Average CDMA Cellular
Average CDMA PCS
Average CDMA Cellular
Average CDMA PCS
CDMA Cellular
CDMA PCS
Cellular: Fc±885kHz
PCS: Fc±1.25MHz
7 9 dBm
dBm
-75
-75
-136
-133
-56
-57
dBm
dBm
dBm/Hz
dBc/
30kHz
1.3.2 Power Amplifier(U1006,U1007)
The power amplifier that can be used in the PCS and CDMA mode has linear amplification capability and h igh
efficiency. For higher efficiency, it is made up of one MMIC (Monolithic Microwave Integrated Circuit) for
which RF input terminal and internal interface circuit are integrated onto one IC after going through the
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AlGaAs/GaAs HBT (heterojunction bipolar transistor) process. The module of power amplifier is made up of an
output end interface circuit including this MMIC. The maximum power that can be inputted through the input
terminal is +10dBm and conversion gain is about 28dB. RF transmit signals that have been amplified through
the power amplifier are sent to the duplexer.
1.3.3 NS740M-20LU (U4006)
FM Transmitter IC (NS740M-20LU) is a FM band low power output transmitter IC. The Left and Right audio
signals are modulated in FM with stereo multiplexing.
Manufactured process is full CMOS process, and DSP is implement. DSP process stereo generation.
Min Max UNIt
Tx Frequency Range 76 108 MHz
Tx output power 0.1 2.0 mW
Consumption Current 15(typ) 20 mA
Standby current 20 uA
1.4 Description of Frequency Synthesizer Circuit
1.4.1 Voltage Control Temperature Compensation Crystal Oscillator (VCTCXO, U1004)
The temperature variation of mobile phone can be compensated by VCTCXO. The reference frequency of a
mobile phone is 19.2MHz. The receives frequency tuning signals called TRK_LO_ADJ from MSM as
0.5V~2.5V DC via R and C filter in order to generate the reference frequency of 19.2MHz and input it into the
frequency synthesizer. Frequency stability depending on temperature is ±2.0 ppm.
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2. Digital/Voice Processing Part
2.1 Overview
The digital/voice processing part processes the user's commands and processes all the digital and voice signal
processing in order to operate in the phone. The digital/voice processing part is made up of a keypad/LCD,
receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.
2.2 Configuration
2.2.1 Keypad and Receptacle Part
This is used to transmit keypad signals to MSM6500. It is made up of a keypad backlight part that illuminates
the keypad part that displays the operation status onto the screen, and a receptacle that receives and sends out
voice and data with external sources.
2.2.2 Voice Processing Part
The voice processing part is made up of an audio codec used to convert MIC signals into digital voice signals
and digital voice signals into analog voice signals, amplifying part for amplifying the voice signals and sending
them to the ear piece, amplifying part that amplifies ringer signals coming out from MSM6500, and amplifying
part that amplifies signals coming out from MIC and transferring them to the audio processor.
2.2.3 MSM (Mobile Station Modem) 6500 Part
MSM is the core elements of CDMA terminal and carries out the functions of CPU, encoder, interleaver,
deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.
2.2.4 Memory Part
The memory part is made up of a sdram/nand memory, nand for storing data.
2.2.5 Power Supply Part
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The power supply part is made up of circuits for generating various types of power, used for the digital/voice
processing part.
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2.3 Circuit Description
2.3.1 Keypad/LCD and Receptacle Part
Once the keypad is pressed, the key signals are sent out to MSM6500 for processing. In addition, when the key
is pressed, the keypad lights up through the use of 14 LEDs. The terminal status and operation are displayed on
the screen for the user with the characters and icons.
Moreover, it exchanges audio signals and data with external sources through the receptacle, and then receives
power from the battery or external batteries.
2.3.2 Audio Processing Part
MIC signals are amplified through OP AMP, inputted into the audio codec(included in MSM6500) and
converted into digital signals. Oppositely, digital audio signals are converted into analog signals after going
through the audio codec. These signals are amplified at the audio amplifier and transmitted to the ear-piece. The
signals from MSM6500 activate the ringer by using signals generated in the timer in MSM6500.
2.3.3 MSM Part
MSM6500 is the core element of CDMA system terminal that includes ARM926EJ-S microprocessor core. It
supports CDMA, operating in both the cellular and PCS spectrums. The subsystems within the MSM6500
include a CDMA processor, a DFM processor, a multi-standard Vocoder, an integrated CODEC with earpiece
and microphone amplifiers, general-purpose ADC for subsytem monitoring, an ARM926EJ-S microprocessor,
and both Universal Serial Bus(USB) and an RS-232 serial interfaces supporting forward and reverse link data
communications of 307.2 Kbps simultaneously. And it also contains complete digital modulation and
demodulation systems for CDMA standards, as specified in IS-95-A/B/C.
In MSM, coded symbols are interleaved in order to cope with multi-path fading. Each data channel is
scrambled by the long code PN sequence of the user in order to ensure the confidentiality of calls. Moreover,
binary quadrature codes are used based on walsh functions in order to discern each channel. Data created thus
are 4-phase modulated by one pair of Pilot PN code and they are used to create I and Q data.
When received, I and Q data are demodulated into symbols by the demodulator, and then de-interleaved in
reverse to the case of transmission. Then, the errors of data received from viterbi decoder are detected and
corrected. They are voice-decoded at the vocoder in order to output digital voice data..
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MSM6500
[Figure 2-2] Block Diagram of Digital/Voice Processing Part
2.3.4 Memory Part
MCP contents 512 Mbits flash memory and 512 Mbits SDRAM. In the Flash Memory part of MCP are
programs used for terminal operation. The programs can be changed through down loading after the assembling
of terminals. On the SDRAM data generated during the terminal operation are stored temporarily.
2.3.5 Power Supply Part
When the battery voltage (+4.0V) is fed and the PWR key of keypad is pressed, the power-up circuitry in PM
(power management) IC (U3002) is activated by the PWR_ON_SW signal, and then the LDO regulators
embedded in PMIC for MSM) are operated and +1.4V_MSMC, +1.8_MSMP1, +2.6V_MSMP2 and
+2.6V_MSMA are generated.
The Rx part regulator (+2.9V_RX) is operated by the control signal of SLEEP/ from MSM6500
The Tx part regulator (+2.85V_TX) is operated by the I2C control signal from MSM6500
2.3.6 Logic Part
The logic part consists of internal CPU of MSM, RAM, MCP. The MSM6500 receives TCXO (=19.2MHz)
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from U1004 and controls the phone in CDMA mode. The major components are as follows:
z
The ARM926EJ-S microprocessor includes a 3 stage pipelined RISC architecture, both 32-bit ARM and
16-bit THUMB instruction sets, a 32-bit address bus, and a 32-bit internal data bus. It has a high performance
and low power consumption.
z
Flash ROM is used to store the terminal’s program. Using the down-loading program, the program can be
changed even after the terminal is fully assembled.
SDRAM is used to store the internal flag information, call processing data, and timer data.
z
For key recognition, key matrix is setup using KYPD[1][3][5][7][9][11][13][15][17][19] signal from MSM.
16 LEDs and backlight circuitry are included in the keypad for easy operation in the dark.
CPU
MCP
KEYPAD
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CHAPTER 4. Safety
IMPORTANT
▣
Read This Information Before Using Your Hand-Held Portable
Cellular Telephone
First introduction in 1984, the hand-held portable cellular telephone is one of the most
exciting and innovative electronic products ever developed.
With it you can stay in contact with your office, your home, emergency service, and others. For the safe and
efficient operation of your phone, observe these guidelines.
Your cellular phone is a radio transmitter and receiver. When it is ON, it receives and also sends out radio
frequency (RF) energy. The phone operates in the frequency range of 824 MHz to 894 MHz and employs
commonly used frequency modulation (FM) techniques. When you use your phone, the cellular system handling
your calls controls the power level at which your phone transmits. The power level can range from 0.006 of a
watt to 0.6 of a watt.
Exposure to Radio Frequency Energy
▣
In 1991 the Institute of Electrical and Electronics Engineers (IEEE), and in 1992 the American National
Standards Institute (ANSI) updates the 1982 ANSI Standard for safety levels with respect to human exposure to
RF energy. Over 120 scientists, engineers, and physicians from universities, government health agencies, and
industry, after reviewing the available boy of research, developed this updated Standard. In March, 1993, the US
Federal Communications Commission (FCC) proposed the adoption of this updated Standard.
The design of your phone complies with this updated Standard. Of course, if you want to limit RF exposure even
further than the updated ANSI Standard, you may choose to control the duration of your calls and opration your
phone in the most power efficient manner.
Efficient Phone Operation
▣
For your phone to operate at the lowest power level, consistent with satisfactory call quality, please observe the
following guidelines:
If your phone has an extendable antenna, extend it fully. Some models allow you to
retracted. However, your phone operates more efficiently with the antenna fully extended.
Hold the phone as you would any other telephone. While speaking directly into the mouthpiece, position the
antenna up and over your shoulder.
Do not hold the antenna when the phone is “IN USE”. Holding the antenna affects call quality and may cause
the phone to operated at a higher power level than needed.
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Antenna Care and Replacement
▣
place a call with the antenna
Do not use the phone with a damaged antenna. If a damaged antenna comes into contact with skin, a minor bum
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