Title :
A 2-GHz CMOS image-reject receiver with LMS calibration
Author :
Der, Lawrence ; Razavi, Behzad
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA
fDate :
2/1/2003 12:00:00 AM
Abstract :
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.
Keywords :
CMOS analogue integrated circuits; UHF amplifiers; UHF integrated circuits; calibration; delay circuits; least mean squares methods; radio receivers; 0.25 micron; 2 GHz; 2.5 V; 5.2 dB; 50 mW; 55 mW; CMOS image-reject receiver; LMS calibration; Weaver image-reject receiver; calibration; continuous signal reception; gain errors; image-rejection ratio; phase errors; sign-sign least-mean squares technique; signal path; third-order input intercept point; CMOS technology; Calibration; Circuits; Degradation; Image converters; Least squares approximation; Multiaccess communication; Prototypes; Radio frequency; Receivers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2002.807407
