A 1-V, 6-nW programmable 4th-order bandpass filter for biomedical applications

This paper presents the design and realization of a programmable 4
^th
-order bandpass filter for biomedical applications in a standard 0.18 μm CMOS technology. The center frequency is adjustable from 80 Hz to 7 KHz, using a 6-bit digital-to-analog-converter (DAC). At a center frequency of 1 KHz and quality factor of 4, the simulated dynamic range is 53.6 dB for 1% total harmonic distortion (THD) and the simulated total input-referred noise, integrated from 875 Hz to 1.125 KHz, is 177 μV. The filter consumes only 6 nW from a 1-V single power supply voltage.