Process and Temperature Invariant Bandwidth and Gain, Low-Area, Low-Power and High Swing G -C Filter for Multichannel Neuro-potential Signal Conditioning

摘要

A novel first order ultra low power and area efficient bandpass G_m-C filter aimed for varieties of neuro-potential signal conditioning applications, in 180nm CMOS process, is presented. The proposed G_m-C filter takes advantage of an ultra low-power constant G_m/C circuit, which leads to constant gain and bandwidth performance. Total current consumption of the bandpass G_m-C filter is 4.03μA and operates at 1.8V supply voltage. The proposed filter has a tunable bandwidth from 160Hz to 7.2kHz and exhibits input referred noise voltage of 4.17μV for a bandwidth of 10.2kHz. The filter provides output voltage swing of 1.55V and occupies area of 250μm×250μm.