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RF Quadrature Modulator

CMX971 - RF Building Block


  • 20 - 1000MHz RF Output
  • 0dBm Output
  • 25MHz I/Q Bandwidth
  • Serial Bus or Direct Control Operation
  • Low Power 61mA @ 3.3V
  • Small 16-lead VQFN Package


  • Wireless Data Terminals
  • HF/VHF and UHF Mobile Radio
  • Avionics Radio Systems
  • Software Defined Radio (SDR)

Supply Requirement:

  • 3.0 to 3.6 V power supply

The CMX971 is a high performance quadrature modulator featuring a wide operating frequency range and attractive power consumption. Control of the CMX971 may be either by serial bus or by direct control (with reduced functionality).

Programmable features include the local oscillator divider ratio (2 or 4). The small, RF-optimised VQFN package and minimal external components make the device ideal for space-constrained applications.

The CMX971’s quadrature architecture supports a wide range of modulation formats and standards. The device provides translation from baseband I/Q signals to a modulated RF signal.

The differential inputs are ideal for direct connection to standard modems and interface ICs such as CML’s CMX7163 Qam Data Modem, CMX7164 Multi Mode Wireless Data Modem, CMX910 AIS Baseband Signal Processor, CMX981 Digital Radio Baseband Processor and CMX7861 Programmable Baseband Interface IC.

The device can operate over the RF output range of 20MHz – 1GHz with a power supply voltage of 3.0V – 3.6V.

Block Diagram

CMX971 Block Diagram

Design Support Information

CMX971 Quadrature Modulator Product Introduction Video This video introduces the CMX971 and discusses its features and benefits.
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