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A 2-GHz CMOS image-reject receiver with LMS calibration

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2 Author(s)
Der, L. ; Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA ; Razavi, B.

This paper describes a sign-sign least-mean squares (LMS) technique to calibrate gain and phase errors in the signal path of a Weaver image-reject receiver. The calibration occurs at startup and the results are stored digitally, allowing continuous signal reception thereafter. Fabricated in a standard digital 0.25-μm CMOS technology, the receiver achieves an image-rejection ratio of 57 dB after calibration, a noise figure of 5.2 dB, and a third-order input intercept point of -17 dBm. The circuit consumes 55 mW in calibration mode and 50 mW in normal receiver mode from a 2.5-V power supply. The prototype occupies an area of 1.23 × 1.84 mm2.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 2 )