A low-voltage adaptive switched-current SDM for bio-acquisition microsystems

Chin Jen Cheng, Shuenn-Yuh Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

An ultra-low voltage and low-power adaptive Switched-Current Sigma-Delta Modulator (SISDM) with a 10-bit dynamic range for bio-microsystem applications is presented. In order to achieve the low-voltage requirement, a novel class-AB switched-current memory cell is adopted to implement the SISDM with the over-sampling ratio (OSR) of 64. In addition, a proposed differential current comparator and a low-voltage 1-bit Switched-current Digit-to-Analog Converter (SIDAC) are used for the design of the SDM. Benefits from the SLSDM using the class AB memory cell are low-power consumption, high linearity, and high dynamic range. For the various applications with different biosignal frequencies, the SISDM could be operated in different operation mode. The overall SDM with core area of 0.05mm 2 has been implemented in a TSMC 0.18μm 1P6M standard CMOS process technology. Without voltage booster to raise the gate voltage of switches, post-layout simulation results show that the SISDM has a dynamic range over 60dB and a power consumption of 180μW with an input signal of 1.25kHz sinusoid wave and 5kHz bandwidth under a single 0.8V power supply for ENG signals.

Original languageEnglish
Title of host publicationISCAS 2006
Subtitle of host publication2006 IEEE International Symposium on Circuits and Systems, Proceedings
Pages341-344
Number of pages4
Publication statusPublished - 2006 Dec 1
EventISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems - Kos, Greece
Duration: 2006 May 212006 May 24

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310

Other

OtherISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems
CountryGreece
CityKos
Period06-05-2106-05-24

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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