Reconfigurable wide-band receiver with positive feed-back translational loop

Abstract

A wide-band receiver for multi-band multi-standard cellular applications with a positive feed-back translational loop is presented in this paper. This technique allows tunable RF filtering right on the input node of the LNA with the base-band filter selectivity. The architecture is highly reconfigurable both regarding the RF channel center frequency and the channel bandwidth. The 65nm CMOS prototype circuit achieves, when in WCDMA mode, attenuation of out-of-band interferers of 12dB at 20MHz frequency offset, improving the out-of-band IIP3 by 17dB. The packaged test-chip provides good performance over a very wide frequency range from 1.3GHz to 2.85GHz.