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A novel response-translating lowpass filter achieving 1.4-to-15-Hz tunable cutoff for biopotential acquisition systems
Ma C.-T.; Mak P.-I.; Vai M.-I.; Mak P.-U.; Pun S.-H.; Feng W.; Martins R.P.
2010-12-20
Conference Name2010 Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics (PrimeAsia)
Source PublicationPrimeAsia 2010 - 2nd Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics
Pages404-407
Conference Date22-24 Sept. 2010
Conference PlaceShanghai, China
Abstract

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. Optimized in a 90-nm CMOS process with 2.5-V thick-oxide devices, a 2-order OTA-C ladder filter demonstrates -40 dB/decade stopband attenuation, 1.4-15 Hz frequency tunability, and strong relaxation of the required time constant (depends on the set chopper frequency). The entire lowpass filter draws 8.37 μA at a 3-V supply.

DOI10.1109/PRIMEASIA.2010.5604876
URLView the original
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
INSTITUTE OF MICROELECTRONICS
AffiliationUniversidade de Macau
Recommended Citation
GB/T 7714
Ma C.-T.,Mak P.-I.,Vai M.-I.,et al. A novel response-translating lowpass filter achieving 1.4-to-15-Hz tunable cutoff for biopotential acquisition systems[C],2010:404-407.
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