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Energy-efficient switching method using input-swapping for high resolution SAR ADCs
  • Serhat Kocak,
  • Tayfun AKIN
Serhat Kocak
Middle East Technical University
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Tayfun AKIN
Middle East Technical University

Corresponding Author:[email protected]

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This paper presents an energy-efficient digital-to-analog converter (DAC) switching method with low common-mode variations for high resolution successive approximation register (SAR) analog-to-digital converters (ADCs), while enabling to implement resolutions such as 14-bit as compared to the typical 10-bit. The proposed switching method enables high resolution by having a nearly constant common-mode voltage and employing input-swapping to use the reference voltage (Vref) only in the sampling phase. This method eliminates the need for the third reference voltage during the entire DAC switching steps, which reduces the required number of switches even compared to the state-of-the-art methods that use low number of switches. The use of lower number of switches not only lowers the DAC control logic complexity, but also results in a faster operation, lower power, and smaller area. When compared to conventional 10-bit SAR ADCs, the proposed switching method in a 10-bit implementation reduces the average switching energy and area by 93.7 % and 75 %, respectively, while offering high resolution implementation options such as 14 bits.
30 Mar 2023Submitted to Electronics Letters
31 Mar 2023Submission Checks Completed
31 Mar 2023Assigned to Editor
14 Apr 2023Reviewer(s) Assigned
07 May 2023Review(s) Completed, Editorial Evaluation Pending
15 May 2023Editorial Decision: Revise Major
20 Jun 20231st Revision Received
20 Jun 2023Submission Checks Completed
20 Jun 2023Assigned to Editor
20 Jun 2023Review(s) Completed, Editorial Evaluation Pending
27 Jun 2023Reviewer(s) Assigned
01 Jul 2023Editorial Decision: Accept