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Title: A frequency-translation technique for low-noise ultra-low-cutoff lowpass filtering
Authors: Mak, Pui In (麥沛然)
Ma, Chon Teng
Martins, Rui Paulo da Silva (馬許願)
Issue Date: Mar-2012
Publisher: Springer Science+Business Media
Citation: Analog integrated circuits and signal processing, Jul. 2012, v. 72, no. 1, p. 265-269
Abstract: Presented is a frequency-translation technique for compact realization of a low-noise lowpass filter (LPF) for biopotential acquisition systems. It is by chopper-stabilizing a bandpass filter (BPF) to obtain an ultra-lowcutoff lowpass response. This technique not only removes the BPF’s flicker noise and dc-offset, but also adds clockbased gain-bandwidth tunability and saves chip area because of highly relaxed time constants. A 1.4 to 15-Hz 2nd-order OTA-C ladder LPF designed in a 90-nm CMOS process verifies the merits of the technique with respect to the prior art.
ISSN: 0925-1030
Keywords: Lowpass filter
Bandpass filter
Access: View full-text via DOI

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