LG GU290V Service Manual

Service Manual Model : GU290v

Internal Use Only

Service Manual

GU290v

Date: September, 2010 / Issue 1.0

Table Of Contents

1. INTRODUCTION ................................................. 5

1.1 Purpose ............................................................................................... 5

1.2 Regulatory Information ............................................................... 5

1.3 Abbreviations ................................................................................... 7

2. PERFORMANCE ..................................................9

2.1 Supporting Standard .................................................................... 9

2.2 Main Parts : Solution ...................................................................... 9

2.3 HW Features ....................................................................................10

2.4 SW Features ....................................................................................11

2.5 RF.........................................................................................................13

2.6 GU290v Figures .............................................................................17

3. TECHNICAL BRIEF ............................................18

3.1 RF Technical Description............................................................18

3.2 WCDMA Part ...................................................................................19

3.3 EDGE/GPRS/GSM RF block ........................................................26

3.4 Control Flow ...................................................................................32

4.15 Vibrator ...........................................................................................84

4.16 Receiver Path ...............................................................................85

4.17 Headset path ...............................................................................87

4.18 Speaker phone path .................................................................89

4.19 Main microphone ......................................................................91

4.20 Headset microphone ................................................................93

5. DOWNLOAD .....................................................95

6. BLOCK DIAGRAM ...........................................108

7. CIRCUIT DIAGRAM ........................................109

8. BGA Pin Map ..................................................117

9. PCB LAYOUT ...................................................121

10. CALIBRATION ...............................................127

10.1 Conﬁguration of Tachyon .................................................... 127

10.2 How to use Tachyon ............................................................... 129

3.5 BB Technica Description ............................................................33

3.6 Power management ....................................................................44

4. TROUBLE SHOOTING ......................................47

4.1 RF Component...............................................................................47

4.2 RF Path ..............................................................................................48

4.3 Trouble Shooting of GSM Part ................................................49

4.4 Trouble Shooting of WCDMA Part .........................................57

4.5 Checking Bluetooth Block ........................................................64

4.6 Checking GPS Block .....................................................................67

4.7 Power ON Troubleshooting ......................................................71

4.8 Charger Troubleshooting ..........................................................73

4.9 USB Troubleshooting ..................................................................74

4.10 USIM Detect Troubleshooting ..............................................76

4.11 Camera Troubleshooting ........................................................78

4.12 Main Keypad Backlight Troubleshooting .........................80

4.13 Sub Keypad Backlight Troubleshooting ...........................81

11. EXPLODED VIEW & REPLACEMENT

PART LIST ....................................................131

11.1 EXPLODED VIEW ......................................................................131

11.2 Replacement Parts..................................................................133

4.14 LCD Troubleshooting ................................................................83

- 3 -

LGE Internal Use Only

- 4 -

Only for training and service purposes

1. INTRODUCTION

1.1 Purpose

This manual provides the information necessary to repair, calibration, description and download the features of this model.

1.2 Regulatory Information

A. Security

Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example, persons other than your company’s employees, agents, subcontractors, or person working on your company’s behalf) can result in substantial additional charges for your telecommunications services. System users are responsible for the security of own system. There are may be risks of toll fraud associated with your telecommunications system. System users are responsible for programming and configuring the equipment to prevent unauthorized use. The manufacturer does not warrant that this product is immune from the above case but will prevent unauthorized use of common-carrier telecommunication service of facilities accessed through or connected to it.

The manufacturer will not be responsible for any charges that result from such unauthorized use.

B. Incidence of Harm

If a telephone company determines that the equipment provided to customer is faulty and possibly causing harm or interruption in service to the telephone network, it should disconnect telephone service until repair can be done. A telephone company may temporarily disconnect service as long as repair is not done.

C. Changes in Service

A local telephone company may make changes in its communications facilities or procedure. If these changes could reasonably be expected to affect the use of the this phone or compatibility with the network, the telephone company is required to give advanced written notice to the user, allowing the user to take appropriate steps to maintain telephone service.

D. Maintenance Limitations

Maintenance limitations on this model must be performed only by the manufacturer or its authorized agent. The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore, note that unauthorized alternations or repair may affect the regulatory status of the system and may void any remaining warranty.

1. INTRODUCTION

- 5 -

LGE Internal Use Only

1. INTRODUCTION

E. Notice of Radiated Emissions

This model complies with rules regarding radiation and radio frequency emission as defined by local regulatory agencies. In accordance with these agencies, you may be required to provide information such as the following to the end user.

F. Pictures

The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly different.

G. Interference and Attenuation

Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from unsuppressed engines or electric motors may cause problems.

H. Electrostatic Sensitive Devices

ATTENTION

Boards, which contain Electrostatic Sensitive Device (ESD), are indicated

by the sign. Following information is ESD handling:

• Service personnel should ground themselves by using a wrist strap when exchange system boards.

• When repairs are made to a system board, they should spread the floor with anti-static mat

which is also grounded.

• Use a suitable, grounded soldering iron.

• Keep sensitive parts in these protective packages until these are used.

• When returning system boards or parts like EEPROM to the factory, use the protective

package as described.

2. INTRODUCTION

- 6 -

Only for training and service purposes

1.3 Abbreviations

For the purposes of this manual, following abbreviations apply:

Offset Phase Locked LoopOPLL

Light Emitting DiodeLED

Low Drop OutputLDO

Liquid Crystal DisplayLCD

Intermediate FrequencyIF

International Portable User IdentityIPUI

Global System for Mobile CommunicationsGSM

General Purpose Interface BusGPIB

Gaussian Minimum Shift KeyingGMSK

Flexible Printed Circuit BoardFPCB

Electrostatic DischargeESD

Electrical Erasable Programmable Read-Only MemoryEEPROM

Digital Signal ProcessingDSP

dB relative to 1 milli wattdBm

Digital Communication SystemDCS

Digital to Analog ConverterDAC

Constant Current – Constant VoltageCC-CV

Bit Error RatioBER

BasebandBB

Automatic Power ControlAPC

1. INTRODUCTION

- 7 -

LGE Internal Use Only

1. INTRODUCTION

Wireless Application Protocol

WAP

Voltage Control Temperature Compensated Crystal OscillatorVCTCXO

Voltage Controlled OscillatorVCO

Universal Asynchronous Receiver/TransmitterUART

Time Division Multiple AccessTDMA

Time Division DuplexTDD

Travel AdapterTA

Side Tone Masking RatingSTMR

Pseudo SRAMPSRAM

Static Random Access MemorySRAM

Sending Loudness RatingSLR

Subscriber Identity ModuleSIM

Surface Acoustic WaveSAW

Real Time ClockRTC

Root Mean SquareRMS

Receiving Loudness RatingRLR

Radio FrequencyRF

Public Switched Telephone NetworkPSTN

Phase Locked LoopPLL

Programmable Gain AmplifierPGA

Printed Circuit BoardPCB

Power Amplifier ModulePAM

1. INTRODUCTION

- 8 -

Only for training and service purposes

2. PERFORMANCE

GU295/GU292 Product Specification

2.1 Supporting Standard

Item Feature Comment

Supporting Standard

WCDMA1900 / WCDMA850

GSM850/GSM900/DCS1800/PCS1900

Frequency Range

GSM850 TX : 824 – 849 MHz

GSM850 RX : 869 – 894 MHz

GSM900 TX : 880 – 915 MHz

GSM900 RX : 925 – 960 MHz

DCS1800 TX : 1710 – 1784 MHz

DCS1800 RX : 1805 – 1880 MHz

PCS1900 TX : 1850 – 1910 MHz

PCS1900 RX : 1930 – 1990 MHz

2.2 Main Parts : Solution

Digital Baseband

Qualcomm QSC6270

Analog Baseband

Qualcomm QSC6270

RF Chip

Qualcomm QSC6270

2. PERFORMANCE

- 9 -

LGE Internal Use Only

2. PERFORMANCE

GU295/GU292 Product Specification

2.3 HW Features

Item Feature Comment

Form Factor

Slide

Battery

900mA,Li-Ion

Size

99.5 x 47 x 16.2mm

Weight

110g (include battery)

Volume

PCB

Rev 1.0

Stand by time

Over 250hrs @ Paging Period 5

Charging time

3hrs

Talk time

3hrs @Power Level 5(850/900)

RX sensitivity

-106dBm

TX output power

GSM850/900:32.5dBm,

DCS/PCS:29.5dBm

Class4(GSM),

Calss1(D/PCS)

SIM card type

1.8V or 3.0V

Display

2.0” 176 x 220

Keypad

Yes

ANT

Yes

System connector

Micro USB

Ear Phone Jack

Yes

PC synchronization

No Option

Memory

2G / 1G MB

Speech coding

Yes

Data & Fax

No

Vibrator

Yes

MIDI

64 Poly

Voice Recording

Yes

Speaker Phone

Yes

Travel Adapter

Yes

CDROM

No Option

Options

Yes

- 10 -

Only for training and service purposes

GU295/GU292 Product Specification

2.4 SW Features

Item Feature Comment

RSSI

0 ~ 5 Levels

Battery Charging

0 ~ 3 Levels

Key Volume

0 ~ 7 Levels

Audio Volume

0 ~ 7 Levels

Time / Date Display

Yes

Multi-Language

Yes

Quick Access Mode

Yes

PC Sync

Yes

Speed Dial

Yes

CLIP / CLIR

Yes

Speaker Phone

Yes

Phone Book

Yes Max 1000

Last Dial Number

Yes

Last Received Number

Yes

Last Missed Number

Yes

Search by Number

/ Name

Partial Search by Name

Group

Yes

Fixed Dial Number

Yes

Service Dial Number

Yes

Own Number

Yes

Voice Memo

Yes

Call Reminder

No

Network Selection

Yes

Call Divert

Yes

Call Barring

Yes

Call Charge (AoC)

No

Call Duration

Yes

SMS

Yes

E-Mail

Yes

SMS Over GPRS

Yes

2. PERFORMANCE

0 ~ 7 Levels

- 11 -

LGE Internal Use Only

2. PERFORMANCE

GU295/GU292 Product Specification

EMS Melody / Picture

Send / Receive / Save

Partial EMS Receive Only /

Save: Melody Only

Long Message

No

Cell Broadcast

Yes

Download

Yes

Game

Yes

Calendar

Yes

Memo Pad

Yes Support smart memo

World Clock

Yes

Unit Convert

Yes

Fax & Data

No

Wall Paper

Yes

WAP Browser

Yes

Download Melody /

Wallpaper

Yes

SIM Lock

Yes

SIM Toolkit

Yes

MMS

Yes

EONS

No

CPHS

Yes

Camera

Yes

JAVA

Yes

Voice Dial

No

IrDA

No

GPRS

Yes

Hold / Retrieve

Yes

Conference Call

Yes

DTMF

Yes

TTY

Yes

AMR

Yes

PTT(Push To Talk)

Yes

No

- 12 -

Only for training and service purposes

GU295/GU292 Product Specification

2.5 RF

2.5.1 RF Transmitter

GU295/GU292 Product Specification

NO Category GSM DCS/PCS

100kHz~1GHz

-36dBm

100kHz ~ 1GHz -36dBm

1G ~ 1710MHz

-30dBm

1.710GHz~1.785GHz

-36dBm

MS allocated

Channel

1GHz ~ 12.75GHz -30dBm

1.785GHz~12.75GHz

-30dBm

100kHz~880MHz

-57dBm

100kHz~880MHz

-57dBm

880MHz~915MHz

-59dBm

880MHz~915MHz

-59dBm

915MHz~1GHz

-57dBm

915MHz~1GHz

-57dBm

1GHz~1.710GHz

-47dBm

1GHz~1.710GHz

-47dBm

1.710GHz~1.785GHz

-53dBm

1.710GHz~1.785GHz

-53dBm

Conducte

d Spurious Emission

Idle Mode

1.785G~12.75GHz

-47dBm

1.785GHz~12.75GHz

-47dBm

30M ~ 1GHz

-36dBm

30M ~ 1GHz -36dBm

1GHz ~ 1710MHz

-30dBm

1710MHz~1785MHz

-36dBm

MS allocated

Channel

1G ~ 4GHz -30dBm

1785MHz~4GHz

-30dBm 30M ~ 880MHz -57dBm 30M ~ 880MHz -57dBm 880M ~ 915MHz -59dBm 880M ~ 915MHz -59dBm 915M ~ 1GHz -57dBm 915M ~ 1GHz -57dBm 1G ~ 1710MHz -47dBm 1G ~ 1710MHz -47dBm 1710M~1785MHz -53dBm 1710M~1785MHz -53dBm

1

Radiated Spurious Emission

Idle Mode

1785M ~ 4GHz -47dBm 1785M ~ 4GHz -47dBm

2 Frequency Error

< 0.1 ppm < 0.1 ppm RMS < 5 degrees RMS < 5 degrees

3 Phase Error

Peak < 20 degrees Peak < 20 degrees

3dB below reference sensitivity 3dB below reference

RA250: 300Hzଝ RA130: ଝଝଝ0Hz HT100: 0Hzଝଝଝ HT100: 3ଝ 50Hz TU50: 0Hzଝଝଝ TU50: 2ଝ 60Hz

4

Frequency Error Under

Multipath and Interference

Condition

TU3: 0Hzଝଝଝ TU1,5: 3ଝ 20Hz 100kHz +0.5dB 100kHz +0.5dB 200kHz -30dB 200kHz -30dB 250kHz -33dB 250kHz -33dB 400kHz -60dB 400kHz -60dB 600~<1,800kHz -60dB 600~<1,800kHz -60dB 1,800~<3,000kHz -63dB 1,800~<3,000kHz -65dB 3,000~<6,000kHz -65dB 3,000~<6,000kHz -65dB

Due to

modulation

>6,000kHz -71dB >6,000kHz -73dB

400kHz -19dB 400kHz -22dB 600kHz -21dB 600kHz -24dB 1200kHz -21dB 1200kHz -24dB

5

Output RF

Spectrum

Due to

Switching

transient

1600kHz -24dB 1600kHz -27dB

Frequency offset 800kHz

7

Intermodulation

attenuation

Intermodulation product should

be Less than 55dB below the level

of Wanted signal

2. PERFORMANCE

- 13 -

LGE Internal Use Only

2. PERFORMANCE

GU295/GU292 Product Specification

Po wer con trol Lev

el

Power (dBm)

Tolerance

(dB)

Power

control

Level

Power

(dBm)

Tolerance

(dB)

5 33 ±2dB

0 30

±2dB

6 31 ±3dB

1 28

±3dB

7 29 ±3dB

2 26

±3dB

8 27 ±3dB

3 24

±3dB

9 25 ±3dB

4 22

±3dB

10 23 ±3dB

5 20

±3dB

11 21 ±3dB

6 18

±3dB

12 19 ±3dB

7 16

±3dB

13 17 ±3dB

8 14

±3dB

14 15 ±3dB

9 12

±4dB

15 13 ±3dB

10 10

±4dB

16 11 ±5dB

11 8

±4dB

17 9 ±5dB

12 6

±4dB

18 7 ±5dB

13 4

±4dB

19 5 ±5dB

14 2

±5dB

8

Transmitter Output Power

15 0

±5dB

9 Burst timing Mask IN Mask IN

- 14 -

Only for training and service purposes

GU295/GU292 Product Specification

2.5.2 RF Receiver

NO Category GSM DCS

1 Sensitivity (TCH/FS Class II) -102dBm -100dBm

2

Co-Channel Rejection

(TCH/FS Class II,

RBER, TUhigh/FH)

C/Ic= 7dB C/Ic= 7dB

200kHz C/Ia1= -12dB C/Ia1= -12dB

3

Adjacent

Channel

Rejection

(Speech

Channel)

400kHz C/Ia2= -44dB C/Ia2= -44dB

Wanted Signal: -98dBm Wanted Signal: -96dBm

1’st interferer: -44dBm 1’st interferer: -44dBm

4 Intermodulation Rejection

2’nd interferer: -45dBm 2’nd interferer: -44dBm

5

Blocking Response

(TCH/FS Class II, RBER)

Wanted Signal: -101dBm

Unwanted Signal: Depend on

freq.

Wanted Signal: -101dBm

Unwanted Signal:

Depend on freq.

z All uncommented feature shall support GSM 11.10 and GCF(GSM Certification Forum)

2. PERFORMANCE

- 15 -

LGE Internal Use Only

2. PERFORMANCE

GU295/GU292 Product Specification

2.5.3 HSDPA Transmitter Specification

Item Specification

Transmit Frequency Band1 : 1920 MHz ~ 1980 MHz

Band5 : 824 MHz ~ 849 MHz

Maximum Output

Power

Sub-Test

1=1/15, 2=12/15 21~25dBm / 3.84 MHz

3=13/15 4=15/8 20~25dBm / 3.84 MHz

5=15/7 6=15/0 19~25dBm / 3.84 MHz

HS-DPCCH

Sub-test

in table

C.10.1.4

Power

step

Power step slot

boundary

Power

step size,

P [dB]

Transmitter power step tolerance

[dB]

1 Start of

Ack/Nack

6 +/- 2.3

2 Start of CQI 1 +/- 0.6

3 Middle of CQI 0 +/- 0.6

5

4 End of CQI 5 +/- 2.3

Spectrum Emission

Mask

Sub-Test : 1=1/15, 2=12/15, 3=13/15, 4=15/8, 5=15/7, 6=15/0

Frequency offset

from carrier ᇞf

Minimum requirement Measurement Bandwidth

2.5 ~ 3.5 MHz -35-15×(ᇞf-2.5)dBc 30 kHz

3.5 ~ 7.5 MHz -35-1×(ᇞf-3.5)dBc 1 MHz

7.5 ~ 8.5 MHz -35-10×(ᇞf-7.5)dBc 1 MHz

8.5 ~ 12.5 MHz -49dBc 1 MHz

Adjacent Channel

Leakage

Power Ratio (ACLR)

Sub-Test : 1=1/15, 2=12/15, 3=13/15, 4=15/8, 5=15/7, 6=15/0

> 33 dB @ ±5 MHz

> 43 dB @ ±10 MHz

Error Vector

Magnitude

< 17.5 %, when Pout ≥ -20 dBm

Band2 : 1850 MHz ~ 1910 MHz

- 16 -

Only for training and service purposes

- 17 -

LGE Internal Use Only

2. PERFORMANCE

GU295/GU292 Product Specification

2.5.4 HSDPA Receiver Specification

Item Specification

Receive Frequency

Band1 : 2110 ~ 2170 MHz

Band8 : 925 ~ 960Hz

Maximum Input Level

(BLER or R), 16QAM Only

Sub-Test : 1=1/15, 2=12/15, 3=13/15, 4=15/8, 5=15/7, 6=15/0

BLER < 10% or R >= 700kbps

2.5.5 GPS Receiver Specification

Item Specification

Receive Frequency 1574.42 MHz ~ 1576.42 MHz

Minimum Sensitivity 1 satellite ≥-142dBm, 7 satellites ≥ -147dBm at coarse time aiding

2.6 GU295 Figures

Band2 : 1930 ~ 1990 MHz

GU290v

3. TECHNICAL BRIEF

GU295

3. RF Technical Description

3.1 RF Technical Description

The RF platform of GU295 supports two different communication modes (WCDMA/GSM modes) including five communication bands (W2100/W850/GSM850/GSM900/GSM1800/GSM1900). The all the RF blocks can be divided into three main parts, which are a WCDMA part, a GSM, and a Antenna switch module. The simplified block diagram is shown in Figure 3.1.1

Figure 3.1.1 Block diagram of RF part

3. TECHNICAL BRIEF

GU290v

- 18 -

Only for training and service purposes

3. TECHNICAL BRIEF

GU295

3.2 WCDMA Part

The W-CDMA transceiver uses differential analog in-phase and quadrature-phase interfaces, that is an IQ interface, both in the receiver and transmitter information path. The transceiver has the following general features: . Power class : Power class 3 (+24dBm) in Band II and V . Zero-IF Receiver.No IF filter needed . Direct IQ modulation transmitter

Figure 3.2.1. WCDMA RF structure

- 19 -

LGE Internal Use Only

3. TECHNICAL BRIEF

GU295

3.2.1 Transmitter Part

WCDMA Transmitter Block

The QSC62x0 device supports tri-band UMTS transmissions with three separate driver amplifier outputs; in fact, most Tx active circuits are contained within the device. All three UMTS transmit paths (Figure 3.2.1.1) begin with a single, shared analog baseband signal from the device’s baseband circuits. The baseband signal is composed of two differential lines, one in-phase component and one quadrature-phase component. Each component is lowpass filtered and amplified to levels sufficient for driving the quadrature upconverters. There are two upconverters — one for low-band signals and one for high band — but only one upconverter is active at a time.

Figure 3.2.1.1 WCDMA Transceiver Architecture

- 20 -

Only for training and service purposes

3. TECHNICAL BRIEF

GU295

The active upconverter’s output is at the desired RF channel frequency and drives the QSC output stages. These RF circuits include multiple variable-gain stages that provide transmit AGC control. A greater than 81 dB gain control range is realized using information from the on-chip Tx power detector combined with a control signal from the baseband circuits. The wide range of driver amplifier output levels is achieved while supporting the WCDMA standard’s requirements for ACLR, spurious emissions, Rx-band noise, etc. The high-band driver amplifier output is followed by a SPDT switch that provides two high-band outputs,

thereby fulfilling the tri-band UMTS requirement. The low-band output port is driven directly by its output

amplifier.

All three output ports are single-ended with 50ohm nominal impedance. Each requires a matching network to interface with its band-pass filter. Each of the three UMTS Tx output chains are functionally identical: the QSC Tx output drives the PA through the band-pass filter and a matching network; a directional coupler provides a sample of the PA output signal;

the through path of the coupler is routed to the Tx port of the duplexer; the duplexer antenna port is connected to the antenna switch; and the switch is connected to the antenna. The coupler outputs provide a low-level sample of the active transmitter’s Tx power. An on-chip powerdetector circuit provides a Tx power estimate that assists in setting the transmit gains and helps ensure that the maximum allowed output power is not exceeded. The three UMTS couplers (one for each band) use a daisy-chain configuration that allows them to share the single, on-chip power detector circuit.

- 21 -

LGE Internal Use Only

3. TECHNICAL BRIEF

GU295

3.2.2 Receiver Part

WCDMA Receiver

The antenna collects the base station forward-link signal and radiates the phone’s reverse-link signal. In the example of a multiband, multimode phone (Figure 3.2.2.1), a switch routes the antenna signals to one of the three UMTS Rx/Tx paths, each beginning with its own band-specific duplexer that separates that band’s receive and transmit paths

Figure 3.2.2.1 WCDMA Receiver schematic

- 22 -

Only for training and service purposes

3. TECHNICAL BRIEF

GU295

Each UMTS duplexer provides a differential output signal that is compatible with its QSC LNA input. The duplexer-to-LNA interface requires a differential matching network (MN) that optimizes the power transfer into the LNA. Although there are three UMTS LNAs, only one is active at a time. The active gain-stepped LNA output drives a shared quadrature downconverter directly — an off-chip inter-stage filter is not required. The elimination of this filter is achieved by a combination of factors:

- New on-chip QSC processing

- Higher performance achieved by the differential duplexer-to-LNA interface

- Greater duplexer suppression of Tx leakage

The downconverter’s RF circuitry includes another gain-stepped amplifier that supplements the LNA gain steps to further extend the receiver dynamic range. The downconverter translates the active LNA’s RF signal directly to baseband, producing two analog outputs: in-phase (I) and quadrature (Q). The UMTS baseband signals are routed to lowpass filters whose passband and stopband characteristics are optimized for the active WCDMA waveform. Both filter outputs are buffered to drive their analog-to-digital converters for digitization. The digital baseband outputs are routed to QSC baseband circuits for further processing.

- 23 -

LGE Internal Use Only

3. TECHNICAL BRIEF

GU295

3.2.3 Power Amplifier Module

The ACPM-5202 is a fully matched 10-pin surface mount module developed for UMTS Band II. This power amplifier module operates in the 1850-1910MHz bandwidth. The ACPM-5202 meets stringent UMTS linearity requirements up to 28dBm output power. The 3mmx3mm form factor package is self contained, incorporating 50ohm input and output matching Networks The ACPM-5202 features 5th generation of CoolPAM circuit technology which supports 3 power modes

– bypass, mid and high power modes. The CoolPAM is stage bypass technology enhancing PAE (power added efficiency) at low and medium power range. Active bypass feature is added to 5th generation to enhance PAE further at low output range. This helps to extend talk time. A directional coupler is integrated into the module and both coupling and isolation ports are available externally, supporting daisy chain.

The power amplifier is manufactured on an advanced InGaP HBT (hetero-junction Bipolar Transistor) MMIC (microwave monolithic integrated circuit) technology offering state-of-the-artreliability, temperature stability and ruggedness.

Figure 3.2.3.1 ACPM-5202 Functional Block Diagram

- 24 -

Only for training and service purposes

3. TECHNICAL BRIEF

DNI

R145

C199 8.2p

1950 MHz,2140 MHz

FL102

95

74

1

2

8

36

ANT TX_IN

RX_OUT2

GND1

RX_OUT1

GND2 GND4

GND3 GND5

FL106

1880,1960MHz

79

25

4

8

1

36

ANT TX_IN

RX_OUT1

RX_OUT2 GND1 GND2 GND4 GND3 GND5

1880MHz

FL105

5 3 2

4 1

INOUT

G1G2G3

C165 33p

C131 DNI

C160 3.3p

5.6pC145

4.7nL120

10n

C114

10pC127

6.8n

L130

L117

DNI

C143 DNI

68

R116

4.7n

L105

L121 3.3p

L125 33K

15pC130

C128 DNI

011R

001

9 01

R

C113 DNI

C142

1n

C141

1n

C140

836.5MHz

FL104

5 3 2

4 1

INOUT

G1G2G3

C136

1n

L107

DNI

L111

3.9pC164

L112

DNI

C133 DNI

C132

4.7p

DNI

L108

1nC122

680p

C185

680p

C184

+VPWR+VPWR

C182 330p

C134 DNI

+VPWR

836.5 MHz,881.5 MHz

FL103

95

7

3

1

2

8

4

6

ANT

GND2

RX_OUT2

GND1

RX_OUT1

TX_IN

GND4

GND3 GND5

C129 DNI

L124 DNI

33pC163

15n

C121

4.7nL119

U103

6 5

7 4

8 3

9 2

10 1

11

PGND

VCC1VCC2

RFINRFOUT

VBPISO

VMODEGND

VENCPL

DNI

C126

C125 DNI

2.2u

C183

2.7nL118

1n

C124

1n

C123

330p

C181

+VPWR

6.8n

C151

0.5p

C161

6.8nL104

3.9n

L123

C162

10p

U102

6 5

7 4

8 3

9 2

10 1

11

PGND

VENCPL

VMODEGND

VBPISO

RFINRFOUT

VCC1VCC2

R103

49.9

8.2n

L122

0.5p

L106

2.2u

C180

C159

10p

PWR_DET

PA_R1

PA_R0

WCDMA_PA_ON0

WLNA_HB2_IN_M

WLNA_HB2_IN_P

WLNA_LB_IN_P

WLNA_LB_IN_M

WCDMA_2100_TX_OUT

WCDMA_900_TX_OUT

WLNA_HB1_IN_M

WLNA_HB1_IN_P

WCDMA_PA_ON1

WCDMA_1900_TX_OUT

WCDMA_2100

WCDMA_LB

WCDMA_1900

W2100

W1900

U103

ACPM-5202

ACPM-5201

W2100

W1900

FL105

B9414

B9640

W850

W900

FL104

B9442

B9425

WCDMA

WCDMA_1900

W900

W850

U102

ACPM-5308

Rev 1.0 ( Band II + V )

WCDMA_2100

ACPM-5305

W

CDMA_850/900

GU295

Figure 3.2.3.2 WCDMA PAM schematic

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LGE Internal Use Only

3. TECHNICAL BRIEF

GU295

3.3 EDGE/GPRS/GSM RF block

The EDGE/GPRS/GSM transceiver use a digital interface that is shared between receive and transmit data. The receive interface is based on I and Q data and the transmitter interface is based on envelop and frequency data. The quad band EDGE/GSM/GPRS transceiver has the following general features:

Power class

GMSK low bands: Class 4 (33 dBm) GMSK high bands: Class 1 (30 dBm) 8PSK low bands: Class E2 (27 dBm)

8PSK high bands: Class E2 (26 dBm) Multi slot class 12 (4+4=5) Dual Transfer Mode (DTM) class 9 (3+2=5) Zero-IF receiver

-Polar modulation transmitter

3.3.1 Transmitter Part

GSM/EDGE Transmitter Block

The QSC62x0 device supports quad-band GSM transmissions with two separate dual-band driver amplifier outputs; in fact, most Tx active circuits are contained within the device. Both GSM transmit paths (Figure 3.3.1.1) begin with a single, shared analog baseband signal from the device’s baseband circuits — the same interface and baseband circuits used by the UMTS transmitters. The GSM transmitters use the same quadrature upconverters as well — one for low band signals and one for high band — with just one active at a time. The transmitter LO signals are generated by circuits described in next section and delivered to the upconverter circuits at the correct frequency, with the proper phase relationship, and with an adequate drive level. The SPDT switches at each driver amplifier input allow selection of the output signal: either the actual GSM signal from the upconverter or a test signal generated by the Tx LO synthesizer. The Tx output chain is functionally identical for both the low band and the high band: the power amplifier is driven by the QSC device through a matching network and a resistive attenuator; the PA output is routed to the antenna switch module whose output is connected to the antenna. In addition to the through signal path, the QSC device also provides the PA ramp control signal that ensures smooth transitions while the transmitter is turned on and off for GSM’s burst transmissions. The ramp signal is generated by one of the baseband circuit’s Tx DACs. A switch after the baseband amplifier selects whether the DAC output signal is routed to GSM PA module for ramping the PA up or down, or to the transmitter signal path for data transmission.

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Only for training and service purposes

3. TECHNICAL BRIEF

GU295

Figure 3.3.1.1 QSC GSM transmitter signal paths functional diagram

3.3.2 Receiver Part

There are two recommended GSM receiver path configurations; both are shown in Figure 3.3.2.1. The configuration shown on top allows the GSM 850 and GSM 1900 bands to share the UMTS 850 and UMTS 1900 paths

for US applications and uses four LNA inputs to support quad-band GSM operation. The lower example uses two LNAs for quad-band GSM operation (one low band and one high band), with two-way SAW filters between the antenna switch and the QSC inputs for each band type.

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LGE Internal Use Only

3. TECHNICAL BRIEF

GU295

Figure 3.3.2.1 QSC GSM receiver signal paths functional diagram

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Only for training and service purposes

3. TECHNICAL BRIEF

GU295

Shared UMTS/GSM configuration (four GSM LNAs)

In this configuration, the GSM 850 receive path shares the UMTS 850 receiver front-end path (including LNA). Beginning at the antenna switch output, the GSM signal is routed through the UMTS850 duplexer to the shared LNA input at pins L22 and K22. Likewise, the GSM 1900 receive path shares the UMTS 1900 front-end, including pins J23 and H23.

The GSM 900 and GSM 1800 bands have dedicated receive paths from the antenna switch outputs to the QSC

LNA inputs.

Each band has its own band-select filter that drives its LNA input. All four GSM bands include input filtering: the 850 and 1900 bands share the UMTS duplexer filtering, while the 900 and 1800 bands have dedicated bandpass filters. The filter functions suppress out-of-band received signals and the handset’s GSM transmitter leakage. Transmit power suppression must be adequate to avoid overdriving the GSM Rx chain. Like the UMTS paths, the GSM paths use a differential configuration into their LNAs, and thus equire differential matching networks.

The internal GSM receivers are functionally identical to the UMTS receivers: although there are multiple GSM LNAs, only one is active at a time. The active gain-stepped LNA output drives a shared quadrature downconverter directly — an off-chip inter-stage filter is not required. The elimination of this filter is achieved by a combination of factors:

 New on-chip QSC processing  Higher performance achieved by the differential duplexer-to-LNA interface  Greater duplexer suppression of Tx leakage

The downconverter’s RF circuitry includes another gain-stepped amplifier that supplements the LNA gain steps to further extend the receiver dynamic range. The downconverter translates the active LNA’s RF signal directly to baseband, producing two analog outputs: in-phase (I) and quadrature (Q). The GSM baseband signals drive lowpass filters whose passband and stopband characteristics are optimized for the active GSM waveform. Both filter outputs are buffered to drive their analog-to-digital converters for digitization. The digital baseband outputs are routed to QSC baseband circuits for further processing. The Rx LO signal is delivered to the downconverter circuits from the LO generation and distribution circuits as described in next section.

Dedicated GSM configuration (two GSM LNAs)

In this configuration, the GSM 850 and GSM 1900 bands do not pass through the UMTS duplexers. Instead, the two GSM LNA inputs are shared: the GSM 850 and GSM 900 bands share the low-band GSM LNA, and the GSM 1800 and GSM 1900 bands share the high-band LNA. Four switch module outputs are required, each driving its own GSM Rx path. A two-way SAW filter takes the two low-band (or high-band) single-ended inputs from the antenna switch and provides one filtered, differential output that drives the appropriate QSC LNA input. Beyond the LNA inputs, this GSM receiver configuration is identical to the paths described earlier for the shared UMTS/GSM configuration.

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LGE Internal Use Only

3. TECHNICAL BRIEF

GU295

3.3.3 Rx LO circuits

The QSC62x0 device integrates all of the frequency synthesizer functions that generate the UMTS and GSM receive LO signals (UHF local oscillator, PLL circuits, and loop filter), plus the distribution circuits that deliver the quadrature LO signals to the two downconverters. The buffered 19.2 MHz TCXO or XO signal provides the synthesizer input (REF), the frequency reference to which the PLL is phase and frequency locked. The reference is divided to create a fixed frequency input to the phase detector, FR. The other phase detector input (FV) varies as the loop acquires a lock and is generated by dividing the local oscillator output frequency using the feedback path’s counter. The closed-loop will force FV to equal FR when locked. If the loop is not locked, the error between FV and FR will create an error signal. This error signal is filtered by the loop filter and applied to the local oscillator, tuning the output frequency so that the error is decreased. Ultimately the loop forces the error to approach zero and the PLL is phase and frequency locked.

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Only for training and service purposes

GU295

3.3.4 Front-End Module (FEM)

 Low-loss SAW frontend module for mobile telephone system  Covering GSM850, GSM900, GSM1800, GSM1900,

3 ports for WCDMA or TD-SCDMA

 Integration of TX low pass filters, switches and decoder  Integration of GSM 850, EGSM, PCN and PCS RX SAWs  Balanced outputs of all RX ports, diplexed for GSM850 / EGSM

and PCN / PCS

 Integration of ESD protection at Ant port to 8kV

acc. IEC-61000-4-2 (contact discharge)

Figure 3.3.4.1 Block diagram of FEM

3. TECHNICAL BRIEF

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LGE Internal Use Only

LG GU290V Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual