A low power discrete-time receiver for triple-band FM/T-DMB/DAB system-on-chip

Abstract

This paper presents a low power discrete-time receiver supporting three broadcast services FM, T-DMB and DAB. To meet the requirement of sensitivity, three LNAs are implemented to cover each band. The proposed mixer core is terminated by a common-gate current buffer to improve linearity and merged with a switched-capacitor sampled filter in current mode for low power and low complexity. The filter performs the second-order low-pass filtering with anti-aliasing ratio up to 70 dB at 1.6 MHz bandwidth. The chip is fabricated in a 90 nm CMOS technology and dissipates 11 mA current from 1.2 V supply. The receiver shows 48 dB maximum gain, 60 dB gain control range, 2.7 dB noise figure, and −22/0 dBm IIP3 in LNA high/low gain mode.