A Low-Frequency LPF with Programmable Gain and Tunable Cut-off Frequency

Abstract

This paper presents a first-order low-pass filter with tunable cut-off frequency and programmable gain. The proposed circuit is based on a super-source follower transconductor, with a current steering second stage. The circuit was designed in a standard 0.18µm CMOS process with a power consumption of 2.99µW for a power supply of 1.8V . The filter shows a tunable frequency from 560 Hz to 22 kHz, with programmable gain from 6 to 20 dB.