Quadrature/low-IF receiver

21 January 2009 Telecoms, Datacoms, Wireless, IoT

CML Microcircuits has added a new quadrature receiver to its family of RF integrated circuits.

Designed to meet the challenging requirements of wireless data and PMR/LMR radio systems, the CMX992 utilises a superheterodyne receiver section along with IF local oscillator circuitry.

Operating from 100 MHz to 1 GHz, the device supports multistandard digital and analog systems of both constant envelope and linear modulation types. The product’s I/Q architecture supports a wide range of modulation types, with various integrated, selectable functions on offer to maintain performance across multiple modulations and bandwidths.

The Rx path includes an integrated first RF mixer having two outputs to support two external first IF filter choices, then an integrated 2:1 filtered first IF input MUX, followed by VGA and wideband RSSI functions to support AGC implementation. The first IF signal can be either I/Q demodulated to zero IF, or mixed down to a low IF output. The demodulator outputs are analog, for simplified connection to external low-power ADCs.

The CMX992 operates at 3,3 V or 1,8 V and comes in a 48-pin VQFN package. An evaluation kit and support tools are also available.

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