A continuous-time bandpass filter implemented in subthreshold CMOS with large-signal stability

Continuous-time bandpass filters implemented in subthreshold CMOS have limited operating range. When processing real acoustic stimuli, input signals exceeding this range may be encountered. We compare the design of a second-order bandpass filter based on three transconductors to that of one based on four transconductors. We show that the four transconductor design does not tend toward oscillations in response to large input signals