Signal Generation 214
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I/Q Modulation Generator AMIQ/Simulation Software WinIQSIM
New approaches in the
generation of complex
I/Q signals
Brief description
I/Q Modulation Generator AMIQ and
Simulation Software WinIQSIM open
up new dimensions for the generation
of I/Q signals. AMIQ is a dual-channel modulation generator that has consequently been designed for use as an
I/Q source. It is programmed and set
with Software WinIQSIM. Alternatively, AMIQ can be operated from a
Vector Signal Generator SMIQ.
Each channel can store 4000000
samples. Even at high symbol rates
sequences of sufficient length can thus
be generated. With clock frequencies
of up to 100 Msample/s and a high
amplitude resolution of 14 bits, AMIQ
is the ideal source for any signal in the
world of digital modulation.
An automatic amplitude/offset alignment as well as fine adjustment of the
skew provide excellent symmetry of
the two channels which previously
was extremely difficult to attain with
dual-channel ARB generators. The
error vector can thus be minimized.
A typical application of AMIQ and
WinIQSIM is not only to drive the I/Q
inputs of a vector signal generator.
This combination is also ideal for
direct applications in the baseband,
eg for testing I/Q modulators/demodulators.
Main features
AMIQ
• 14-bit resolution
• 4000000 samples memory depth
• 100 MHz sample rate
• Integrated hard disk and
floppy disk drive
• Optional BER measurement
WinIQSIM
• Calculation of digitally modulated
I/Q and IF signals
• Single-carrier, multicarrier and
CDMA signals
• Versatile data editor
• Superposition/simulation of
impairments
• Graphic display
I/Q simulation software
Modulation methods
like GMSK or
π/4DQPSK are used in
mobile communication
systems such as GSM
(Global System for
Mobile Communications) or NADC (North
American Digital Cellular). These complex
modulation modes are
usually generated with the aid of an I/
Q or vector modulator. The calculation
and generation of the required baseband signals is of course quite complex.
WinIQSIM, successor of the wellproven IQSIM, is a Windows software
allowing calculation of I and Q baseband signals. Its capabilities range
from single-carrier modulation, generation of multicarrier, CDMA and
W-CDMA signals through to TDMA
frame configurations with the help of a
convenient data editor. All modulation
parameters and impairments can be
simulated for single-carrier and multicarrier as well as for CDMA signals.
To put it in a nutshell: WinIQSIM is an
indispensable tool for anyone
engaged in modern digital modulation.
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Signal Generation 215
12
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Specifications in brief
AMIQ
Output memory
Waveform length
(data and markers)
Clock rate mode 1 (10 Hz to 4 MHz) 24 to 4000000 samples in steps of
Clock rate mode 2 (2 to100 MHz) 24 to 4000000 samples in steps of
Amplitude resolution 14 bits
Marker outputs 4
Clock generation
Clock rate
Mode 1 (slow) 10 Hz to 4 MHz
Mode 2 (fast) 2 MHz to 100 MHz
Setting range 10 Hz to 105 MHz
Resolution 1 x 10
a. Specs not guaranteed for clock >100 MHz, max. ambient temperature 35 °C
Reference frequency
Internal reference output
Frequency 10 MHz
Aging (after 30 days of
operation)
Temperature effect (0°C to 45°C) <2 x 10−6/°C
Signal output
Number of outputs 2 (I and Q)
Output impedance 50 Ω
Output voltage (Vp into 50 Ω)
Fix mode 0.5 V, same for both channels
Variable mode 0 mV to 1 V, separately adjustable
Skew between I and Q channel (filter
off, clock rate 10 MHz, fix mode)
Fine variation
Resolution
Effective bits (sinewave 5 MHz, clock
frequency 50 MHz, fix mode)
Filters
Operating modes off (no filter), ext. filter, int. filter
Internal filters
25 MHz, elliptic, 7th order +
delay equalizer
Freq. response Amplitude typ. 0.15 dB up to 25 MHz
2.5 MHz, elliptic, 7th order
+ delay equalizer
Freq. response Amplitude typ. 0.15 dB up to 2.5 MHz
Trigge r
CONT mode repetitive output of loaded waveform
SINGLE mode si ng le o ut put of loa de d wa ve form after
GATED mode start of (repetitive) waveform output
Trigger signal via remote control or trigger input
Trigger input BNC connector, selectable polarity
Input level TTL
Marker outputs
Group delay typ. 500 ps up to 20 MHz
Group delay typ. 5 ns up to 2 MHz
one
four
−7
1 x 10−5/year
for each channel
typ. ±1 ns
<10 ps
typ. 11
after occurrence of trigger
occurrence of trigger
after occurrence of trigger until end
of trigger event
4, BNC connectors
a
Type Index
BER (option AMIQ-B1)
Data supplied by the DUT can be compared with a nominal random bit sequence; the results are transferred to the host computer (via the currently used
remote control)
Pseudo random bit sequences
Remote control and memory via IEC 625-2 (IEEE 488) and RS232
Command set SCPI 1996.0 with extensions
Mass memory floppy disk drive (3.5", 1.44 MB),
General data
Rated temperature range 0°C to +45°C; to IEC68-2-1 and
Storage temperature range −40°C to +70°C
Power supply 90 V to 132 V (AC), 47 Hz to 63 Hz,
Dimensions (W x H x D) 427 mm x 88 mm x 450 mm
Weight 8.4 kg
29−1, 211−1, 215−1 ,220−1, 223−1
built-in hard disk 1 GB
IEC68-2-2
180 V to 264 V (AC), 47 Hz to 63 Hz,
autoranging of AC supply, 150 VA
WinIQSIM
User interface Windows interface with
Systems single-carrier, IF signals up to 25 MHz,
Modulation modes
PSK
QAM
FSK
User-specific modulation
Data editor definition of TDMA data structures
Sequence length 1 to max. 4 M symbols
Simulation of impairments and
transfer characteristics
Graphic output user-selectable scaling, zoom func-
Remote control of AMIQ download and starting of waveforms,
context-sensitive help
multicarrier, up to 512 carriers with or
without modulation, with variable
power, W-CDMA
BPSK, QPSK, offset QPSK,
π/4DQPSK, 8PSK; parameter: reference level
16/32/64/256QAM; parameter:
reference level
MSK, 2FSK, 4FSK, GTFM; parameter: modulation index 0.1to 12;
GTFM b 0 to 1
with power-time templates
I/Q impairments, phase, bandpass,
amplifier models, power ramping,
multipath propagation, offset, additive interferers, receiver filters, quantization, smoothing
tion, delta marker; display modes:
i(t), q(t), r(t), phi(t), r(t), f(t), eye I,
eye Q, eye F, vector diagram, constellation diagram, magnitude/
phase/group delay spectrum
hardware configuration, alignment
and fine adjustment, file management
Ordering information
I/Q Modulation Generator AMIQ 1110.2003.02
Accessories supplied WinIQSIM, version für Windows 3.x
Options
BER Measurement AMIQ-B1 1110.3500.02
Rear I/Q Outputs AMIQ-B19
Recommended extras
19" Rack Adapter ZZA-211 1096.3260.00
and Windows 95/NT on 3.5”disks;
manual, dongle; power cable,
operating manual
1)
1110.3400.02
1)
Marker outputs 3 and 4 not provided if this option is fitted
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