A current-mode VCO-based amplifier-less 2nd-order ΔΣ modulator with over 85dB SNDR

Somayeh Abdollahvand, Nuno Paulino, Luis Gomes, Joao Goes

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

Abstract

In this paper, a new current-mode VCO-based delta-sigma modulator is presented to avoid the need to use operational-transconductance amplifiers (OTAs), which are usually the most power hungry building-blocks. The proposed hybrid structure doesn't require an explicit high-gain block in the loop filter in order to achieve high resolution with second order noise shaping. Simulation results show the proposed current-mode VCO-based ADC performance is able to achieve to SNDR/SNR of 85/85.4dB with 5MHz bandwidth with only 2dB gain in the front-end current-mode integrator. The circuit architecture uses two 4-bit pseudo-differential VCO-based quantizers, operating in parallel, and two current-steering DACs providing intrinsic dynamic element matching (DEM).

Original languageEnglish
Title of host publication2015 IEEE International Symposium on Circuits and Systems (ISCAS)
Place of PublicationNew York
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2037-2040
Number of pages4
ISBN (Electronic)978-1-4799-8391-9
DOIs
Publication statusPublished - 27 Jul 2015
EventIEEE International Symposium on Circuits and Systems, ISCAS 2015 - Lisbon, Portugal
Duration: 24 May 201527 May 2015

Publication series

NameIEEE International Symposium on Circuits and Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Volume2015-July
ISSN (Print)0271-4302
ISSN (Electronic)2158-1525

Conference

ConferenceIEEE International Symposium on Circuits and Systems, ISCAS 2015
CountryPortugal
CityLisbon
Period24/05/1527/05/15

Keywords

  • delta-sigma analog to digital converter (ΔΣ-ADC)
  • quantizer
  • VCO-based

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    Abdollahvand, S., Paulino, N., Gomes, L., & Goes, J. (2015). A current-mode VCO-based amplifier-less 2nd-order ΔΣ modulator with over 85dB SNDR. In 2015 IEEE International Symposium on Circuits and Systems (ISCAS) (pp. 2037-2040). [7169077] (IEEE International Symposium on Circuits and Systems; Vol. 2015-July). New York: Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCAS.2015.7169077