A self-calibrating 900-MHz CMOS image-reject receiver

This paper introduces an analog phase and gain calibration technique for image-reject receivers. The technique uniquely detects the phase and gain mismatches and drives their magnitudes toward zero through the use of a negative-feedback loop. An experimental CMOS prototype operating at 900 MHz achieves an image rejection ratio of 57 dB by applying phase calibration to a Weaver architecture. Fabricated in a 0.35-µm CMOS technology and running from a 3-V supply, the receiver dissipates 105 mW during the receive mode and 170 mW during the calibration mode.