Direct conversion I/Q demodulator minimises external components
CML Microcircuits has added a new Direct Conversion Receiver IC (DCRx) to its family of RF ICs. The CMX994 targets the next generation of multi-mode Software Defined Radios (SDR) for wireless data and two-way radio applications. CML says its design provides an optimum route for on-board integration, allowing a small RF receiver to be realised with a minimum of external components in both zero IF and low IF systems. 
Until recently, most radios have used the superheterodyne (Superhet) receiver, however enhancements in semiconductor technology have enabled the integration of DCRx, allowing it to become the 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.