Analog VLSI and neural systems
Analog VLSI and neural systems
Minimum parasitic effects biquadratic OTA-C filter architectures
Analog Integrated Circuits and Signal Processing
Design of analog-digital VLSI circuits for telecommunications and signal processing
Design of an Analogue VLSI Model of an Active Cochlea
Analog Integrated Circuits and Signal Processing
Analog Cochlear Model for Multiresolution Speech Analysis
Advances in Neural Information Processing Systems 5, [NIPS Conference]
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Continuous-time filters implemented in subthreshold CMOS have limited operating range. When processing real acoustic stimuli, input signals exceeding this range will occasionally be encountered. We compare the response of an RLC proto-type bandpass filter based on three transconductors to that of one based on four transconductors. It is found that, in response to large slowly varying input signals, the three-transconductor design tends toward oscillation whereas the four-transconductor design is stable. Simulation and chip measurements of a four-transconductor bandpass filter implemented in a 2-μm process verify these claims. The filter measures 117×416 μm^2, operates on ±1.25 V supplies, and consumes less than 20 nW when tuned to 1 kHz.