Key result
A gain-compensated subthreshold-source-follower Biquad LPF achieved a DC gain of 0 dB, input-referred noise of 29 μV rms, and die size of 0.08 mm², drawing 15 nW at 3 V.
Population
Two 100-Hz 4th-order Butterworth lowpass filters fabricated in 0.35-μm CMOS using…
Comparison
Gain-compensation (GC) scheme vs Non-gain-compensation (non-GC) scheme
Design
Other
Authors
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May enable compact low-power biopotential front-ends; leaves open validation in cardiovascular monitoring systems.
The proposed gain-compensated subthreshold-source-follower Biquad LPF improves DC gain, noise, linearity, and area footprint while maintaining ultra-low power consumption for biopotential readout front-ends.
Zhang et al. (2013) studied this question. Subthreshold-source-follower (SSF) Biquad with gain compensation vs. SSF Biquad without gain compensation was evaluated on DC gain, input-referred noise, HD3@60 Hz, and die size. A gain-compensated subthreshold-source-follower Biquad LPF achieved a DC gain of 0 dB, input-referred noise of 29 μV rms, and die size of 0.08 mm², drawing 15 nW at 3 V.
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