Direct Conversion has the ‘Edge’ for SDR Design
CML Microcircuits has increased the operating range of its CMX994 Direct Conversion Receiver. Through an on-going research and development programme, CML has extended the operating range of the CMX994 Direct Conversion Receiver IC. Now operating over an RF range of 50MHz to 940MHz, the CMX994 now addresses a wider range of Software Defined Radio demands.The
A DCRx mixes the wanted RF signal down to 0Hz in a single quadrature mixing process using a local oscillator 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 CMX994 DCRx IC offers excellent RF performance, exceptional IP2 from I/Q mixers and is suitable for modulation schemes including: QAM, 4FSK, GMSK and pi/4-DQPSK. Key features of the device include on-chip VCO for VHF applications, on-chip LNA, precision baseband filtering with selectable bandwidths and the smallest PCB area, typically less than 50% of a dual superhet.
The CMX994 is available now, operates at 3.0 - 3.6 V, and comes in a Q4 40-pin VQFN package.