University of Oulu

Sun, J. & Rahkonen, T. Analog Integr Circ Sig Process (2019) 100: 653.

Continuously controlled and discrete-level charge pumping techniques implemented in SC integrators

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Author: Sun, Jia1; Rahkonen, Timo1
Organizations: 1Research Group of Circuits and Systems(CAS), Faculty of Information Technology and Electrical Engineering, University of Oulu, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Springer Nature, 2019
Publish Date: 2019-08-06


This paper presents two methods to reduce power consumption of switched capacitor (SC) integrators in sigma-delta analog to digital converters. The proposed two methods are based on the passive charge re-distribution technique, injecting charge into the output of the first integrator. The injected charge can be attained by a continuous function of the input voltage and feedback, or by quantizing the injected charge into three levels. In both cases, the main purpose is to minimize the initial transient voltage at the input of the first operational transconductance amplifiers (OTA), in order to bypass the slewing region of the OTA and enter into the linear settling region. Then a minor charge is left, and needs to be moved by the OTA. Using these two charge pumping techniques separately, a 10-bit performance of a conventional second-order delayed cascaded 1-bit sigma-delta modulator which consists of two SC integrators can be obtained by only consuming 60% power dissipation of the traditional structure without proposed techniques.

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Series: Analog integrated circuits and signal processing
ISSN: 0925-1030
ISSN-E: 1573-1979
ISSN-L: 0925-1030
Volume: 100
Issue: 3
Pages: 653 - 661
DOI: 10.1007/s10470-019-01460-8
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: Open access funding provided by University of Oulu including Oulu University Hospital.
Copyright information: © The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.