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This paper presents a response-translation technique to realize an ultra-low-cutoff lowpass filter in small area for biopotential acquisition systems. It is by exploiting a chopper-stabilized instrumentation amplifier (IA) with bandpass characteristic to obtain a lowpass response after chopper stabilization, resulting in substantial area savings because of relaxed time constant in the implementation...
This paper describes a 90 nm CMOS low-noise low-power biopotential signal readout front-end (RFE). The front-stage instrumentation amplifier (IA) features a chopper; an AC-coupler and a novel chopper notch filter for minimizing the DC-offset; transistors' flicker noise and 50 Hz powerline interference concurrently. A noise-aware transistor selection (thin- and thick-oxide) in the IA enables a flexible...
Presented is a novel powerline notch filter embeddable into a chopper-stabilised instrumentation amplifier for biopotential measurements. The frequency-translation property of the chopper enables the powerline notching to be indirectly implemented by two resonant zeros around the chopper frequency, resulting in substantial silicon area savings. Transistor-level implementation in 90 nm CMOS using a...
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