1.2V constant-gm rail-to-rail CMOS Op-Amp input stage with new overlapped transition regions technique for ECG amplifier

Boram Lee, Ted Higman

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

7 Scopus citations

Abstract

The conventional technique of overlapped transition regions for producing a constant transconductance rail to rail Op-Amp input stage can only tolerate a limited amount of voltage shifting. This is limited by the minimum Vgs required for active mode operation of transistors. In this paper, we present a novel overlapped transition regions technique that overcomes the limitation of the conventional technique. This new overlapped transition regions technique has no voltage shifting limit. For both N-type and P-type conventional complementary differential input pairs, one source follower and one MOSFET are added to control the saturation point of current of input pairs. For 1.2V single supply voltage, simulation results demonstrate ±3.71% of overall transconductance variation. Cadence SPECTRE simulator and TSMC 0.25-μm CMOS technology are used to layout and simulate this work.

Original languageEnglish (US)
Title of host publicationProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
Pages3451-3454
Number of pages4
Volume2013
DOIs
StatePublished - 2013
Event2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013 - Osaka, Japan
Duration: Jul 3 2013Jul 7 2013

Publication series

NameProceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS
ISSN (Print)1557-170X

Other

Other2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2013
CountryJapan
CityOsaka
Period7/3/137/7/13

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Cite this

Lee, B., & Higman, T. (2013). 1.2V constant-gm rail-to-rail CMOS Op-Amp input stage with new overlapped transition regions technique for ECG amplifier. In Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS (Vol. 2013, pp. 3451-3454). [6610284] (Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS). https://doi.org/10.1109/EMBC.2013.6610284