Wideband, high data-rate, six-port direct-conversion receiver with improved output matching and sensitivity

A wideband, six-port, direct-conversion receiver operating between 0.9 GHz and 5 GHz is presented. It employs distributed power detectors that achieve good matching up to 4 GHz and more than twice the sensitivity as compared to a resistive-matching detector. Comparison of the proposed receiver to one employing resistive-matching detectors, is also presented. The proposed design is able to deliver comparably higher data-rates for a given EVM. Alternately, it provides better EVM for the same data-rate. Measurement results demonstrate the successful demodulation of a 200 Mbps, 16 QAM signal operating at a carrier-frequency of 2.4 GHz.