A 0.033mm2 Integrated Tunable Low-Pass Filter for Wideband Transceiver RFIC in 65 nm CMOS

Abstract

A tunable 3rd-order Butterworth low-pass filter occupying a miniaturized 0.033 mm2 chip area is designed and integrated as a building block in a 65 nm CMOS wideband transceiver RFIC for multi-mode channel selection. Using compact binary-weighted current mode output OTA, the filter exhibits digitally programmable cutoff frequencies from 13.3 to 53.6 MHz. Measurement results show an in-band IIP3 of 19–21 dBm, and an input-referred noise of 33–38 nV/√Hz at a power consumption of 4.7-8.4 mW from a 1.2 V supply.