Home > CMX994 direct conversion I/Q demodulators now available from Caelera

CMX994 direct conversion I/Q demodulators now available from Caelera

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CML Microcircuits has added the CMX994 Direct Conversion Receiver (DCRx) to its family of RF Integrated Circuits, now available from Caelera . CMX994 receivers target the next generation of multi-mode Software Defined Radios (SDR) for wireless data and two-way radio applications. Its design provides the optimum route for on-board integration allowing a small RF receiver to be realised with a minimum of external components. The small size and flexibility of direct conversion make it a key element for the next generation of multi-moden software defined radios (SDR) for wireless data and digital two-way radio applications.

Key features of the CMX994 receivers include:

  • These receivers feature on-chip VCO for VHF applications
  • The CMX994 direct conversion receivers an operating range of 100MHz to 1GHz
  • They feature precision baseband filtering with selectable bandwidths
  • A small PCB area is another feature of these receivers, typically less than 50% of a dual superhet
  • Another important feature is the single ended RF connections meaning no baluns are required
Until recently, most radios used the superheterodyne (Superhet) receiver, but enhancements in semiconductor technology have seen DCRx increasingly replace superhet as technology of choice for radio receivers in many applications. A DCRx mixes the wanted RF signal down to 0Hz in a single quadrature mixing process using a local oscillator (LO) tuned to the wanted RF channel frequency.  Selectivity filtering and gain can now take place at baseband with practical, low power, analogue and digital circuits. DCRx also eliminates the need for an image reject filter.


The small size and flexibility of direct conversion make it a key element for the next generation of multi-moden software defined radios (SDR) for wireless data and digital two-way radio applications.

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