A Low-Power Complex Bandpass Gm-C Filter with Dynamic Range Expansion through Adaptive Biasing

This paper presents a first-order complex bandpass filter designed with a large-signal linearization technique. A novel adaptive biasing circuit is proposed to extend the linear range of the filter, which was designed in 130nm CMOS technology with a power consumption of 26.1 μW from a 0.6 V supply. The simulated center frequency and bandwidth of the filter are 2 MHz and 600 KHz respectively. It has an image rejection ratio of 22 dB per pole and an out-of-band spurious-free dynamic range of 56.0 dB.