A CMOS highly linear channel-select filter for 3G multistandardintegrated wireless receivers

摘要

A new approach for designing digitally programmable CMOSnintegrated baseband filters is presented. The proposed techniquenprovides a systematic method for designing filters exhibiting highnlinearity and low power. A sixth-order Butterworth low-pass filter withn14-bit bandwidth tuning range is designed for implementing the basebandnchannel-select filter in an integrated multistandard wireless receiver.nThe filter consumes a current of 2.25 mA from a 2.7-V supply andnoccupies an area of 1.25 mm2 in a 0.5-Μm chip. Thenproposed filter design achieves high spurious free dynamic rangesn(SFDRs) of 92 dB for PDC (IS-54), 89 dB for GSM, 84 dB for IS-95, and 80ndB for WCDMA