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Digital Modulation Signal Generator

This product has been discontinued Replacement Model(s) : MG3700A
  • Frequency Range
    • 250 kHz to 3 GHz
  • Output level
    • -143 to +13 dBm
  • Resolution
    • 0.01 Hz output
    • 0.01 dB level
  • Signal Purity
    • -145 dBc/Hz at 5 MHz offset
  • Seven Expansion Slots

The MG3681A is a high performance digital modulation signal generator that incorporates a broadband vector modulator. It has a frequency range of 250 kHz to 3000 MHz, covering the frequency bands of all major mobile communications systems. Various modulated signal waveforms can be generated with the optional expansion units and associated software.

  • Broadband vector modulation (DC to 30 MHz)
  • Excellent adjacent channel power characteristics (-68dBc/Ch at 5MHZ and -75dBc/Ch at 10MHz)
  • AWGN source (option)
  • Power control function (Transmit Power control)
  • Generation of multiple waveforms up to 512 channels (option)
  • Supports chip rates up to 16.5 Mcps
  • Superior AM and FM analog modulation functions
  • Support for various digital modulation types including 3GPP, GSM, cdmaOne (option)


Communication system

Applicable software

Expansion units

PDCPDC SoftwareTDMA Modulation Unit
GSMGSM Device Test Software
3GPP (FDD)W-CDMA SoftwareCDMA Modulation Unit
cdmaOneIS-95 Device Test Software
CDMA2000 1XDevice Test Signal Generation SoftwareUniversal Modulation Unit
CDMA2000 1xEV-DO
CDMA2000 1xEV-DOCDMA2000 1xEV-DO Signal Generation Software
PDC packetPDC Packet Software
PHSMX368035A PHS Signal Generation Software

Reference oscillator (Option 1)Aging rate: 5 x 10–9/day
Reference oscillator(Option 2)Aging rate: 5 x 10–10/day
I/Q OutputLevel and DC offset setting, differential output
AF synthesizer0.01 Hz to 400 kHz, resolution: 0.01 Hz
Increase RF Output8 dB gain

  • Evaluation of W-CDMA/HSDPA systems (Uplink and Downlink)
    • Multiplex up to 12 channels
    • Test Model Patterns included for rapid testing
    • Internally generate various channel formats for base station emulation
    • Use HSDPA IQproducer™ to generate standard compliant signals and error cases
  • AWGN
    • Add AWGN to any signal
    • Satisfy requirements for dynamic range and interference testing specified by 3GPP and 3GPP2
  • Evaluation of CDMA2000 1xEV-DO systems
    • Create and edit waveforms using IQproducer™ for EV-DO