Telecoms, Datacoms, Wireless, IoT


Direct conversion I/Q demodulator

28 April 2010 Telecoms, Datacoms, Wireless, IoT

CML has added a new direct conversion receiver (DCRx) IC to its family of RF integrated circuits. The CMX994 targets the next generation of multimode software defined radios (SDR) for wireless data and two-way radio applications. Its design provides a route for onboard 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 0 Hz in a single quadrature mixing process using a local oscillator (LO) tuned to the wanted RF channel frequency. Selectivity filtering and gain can then take place at baseband with practical, low-power analog and digital circuits. DCRx also eliminates the need for an image-reject filter.

Key features of the CMX994 include on-chip VCO for VHF applications, an operating range of 100 MHz to 1 GHz, precision baseband filtering with selectable bandwidths and a small PCB area typically less than 50% of a dual superhet. Another important feature is the single ended RF connections meaning no baluns are required. The device operates at 3,0–3,6 V, and comes in a Q4 40 VQFN package.



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