MG3681A
Digital Modulation Signal Generator
250 kHz to 3 GHz
For Evaluating Next Generation Digital Mobile Communications Systems
For Wideband, High-speed
Digital Mobile Communications
The MG3681A uses a wideband vector modulator to output the high-accuracy, high-speed vector
modulation signals that are required for R&D and manufacturing of digital mobile communications
equipment and related devices. It covers, the frequency band of leading mobile communications
systems for the frequency range of 250 kHz to 3 GHz.
It uses vector modulator to provide excellent frequency response, distortion and S/N ratio. It can
perform accurate receiver sensitivity test and transmitter adjacent channel leakage power test for
high-speed modulation communications systems.
Expansion units such as MU368040A CDMA Modulation Unit for modulation signals generation of
W-CDMA communication system can be installed on the seven expansion slots in the MG3681A.
Various modulation signals can be generated with the expansion units and associated software.
The MG3681A also has analog modulation functions such as AM and FM for testing of analog
communications systems. In addition, its excellent signal purity and various functions such as
memory and frequency sweep are useful as a general-purpose signal generator.
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High-resolution Setting of Frequency 0.01 Hz and Output Level 0.01 dB
•
30 MHz Wideband and High-Accuracy Vector Modulation
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Excellent Adjacent Channel Leakage Power Ratio
•
Various Expansion Units
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Excellent Analog Basic Performance
Excellent Level Accuracy Signal
The frequency response is excellent by calibrating output
level across the entire output RF frequency range. Even
low level can be output with high-accuracy due to use of a
high-precision, high-reliability step attenuator calibrated.
Output level frequency response
Wideband Vector Modulation
The modulation frequency response of ±3 dB at the
modulation frequency from DC to 30 MHz is achievable by
the high-speed baseband signal processor and wideband
vector modulator, permitting wideband vector modulation
supporting high-speed data communications including WCDMA system. Accurate wideband vector modulation is
also available by using the external I/Q signals as well as
internal modulation using the optional modulation units
installed. In addition, a unique Automatic Level Control
(ALC) technology assures stable output level at vector
modulation.
Output level accuracy
Excellent Signal Purity
Digital mobile communications evolve into wideband RF
frequency bandwidth, and signal generator requires lownoise signal to faraway frequency offset. A unique
synthesizer technology achieves low noise floor
characteristics of –145 dBc/Hz (typ. at above 5 MHz
offset).
Vector modulation frequency response
Output level stability at W-CDMA system modulation
SSB phase noise characteristics
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Flexible System Configuration
Expansion Units for up to Seven Slots
Seven slots for expansion units have 14 bits high-speed
waveform data bus each In-phase and Quadrature
signals. The excellent expansible platform covers future
communication systems by addition of expansion units.
Note: Some expansion units require installation of dedicated software to enable
functionality.
Expansion unit Software
MU368010A PDC Software
TDMA Modulation Unit MX368012A
MU368040A W-CDMA Software
CDMA Modulation Unit MX368042A
MU368030A CDMA2000 1xEV-DO Signal
Universal Modulation Unit Generation Software
MU368060A
AWGN Unit
MX368011A
GSM Device Test Software
MX368041B
IS-95 Device Test Software
MX368031A
Device Test Signal Generation
Software
MX368033A
MX368034A
PDC Packet Software
MX368035A
PHS Signal Generation Software
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Excellent Adjacent Channel Leakage Power Ratio
The adjacent channel leakage power ratio of the digital
modulation signal generator is an important factor in
distortion testing of device and interference testing of
receiver.
The MG3681A achieves an excellent adjacent channel
leakage power ratio by an optimized circuit design. The
typical adjacent channel leakage power ratio for W-CDMA
system is –68 dBc/3.84 MHz and the secondary adjacent
channel leakage power ratio is –75 dBc/3.84 MHz.
W-CDMA system adjacent channel leakage power ratio at 16 code
multiplex
IS-95 system adjacent channel power ratio at 9 code multiplex
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