A 0.7-V 600-nW 87-dB SNDR DT-Delta Sigma Modulator with Partly Body-Driven and Switched Op-amps for Biopotential Signal Acquisition
2012 (English)In: 2012 IEEE BIOMEDICAL CIRCUITS AND SYSTEMS CONFERENCE (BIOCAS): INTELLIGENT BIOMEDICAL ELECTRONICS AND SYSTEM FOR BETTER LIFE AND BETTER ENVIRONMENT, IEEE , 2012, 336-339 p.Conference paper (Refereed)
A 0.7 V third-order DT Delta Sigma modulator is presented in this paper for measurement of biopotential signals in portable medical applications. Switched-opamp technique has been adopted in this design to eliminate the critical switches, which leads to low-voltage and low-power consumption. The modulator employs new partially body-driven gain-enhanced amplifiers for low-voltage operation in order to compensate the dc gain degradation. Switched-opamp approach is embedded in amplifiers and CMFB circuits to reduce the power consumption. The major building blocks, such as the proposed Class AB gain-enhanced amplifiers and the low-voltage comparator, use body-biased p-MOS to reduce the threshold voltage, thus providing more voltage headroom in the low voltage environment. Noise analysis, as a critical step in the design of a high resolution ADC, is also provided. Designed in a 65nm CMOS technology, the modulator achieves 87 dB peak SNDR over a 500 Hz signal bandwidth, while it consumes 600-nW from a 0.7 V supply.
Place, publisher, year, edition, pages
IEEE , 2012. 336-339 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-96534DOI: 10.1109/BioCAS.2012.6418428ISI: 000316563200099ISBN: 978-1-4673-2291-1 (print)OAI: oai:DiVA.org:liu-96534DiVA: diva2:642320
IEEE Biomedical Circuits and Systems Conference (BioCAS 2012), 28-30 November 2012, Hsinchu, Taiwan