A low-power capacitor switching scheme with low common-mode voltage variation for successive approximation ADC

A. Rasool Ghasemi, Mehdi Saberi, Reza Lotfi

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

In this paper, a new low-energy switching technique with low common-mode voltage variation is proposed for successive-approximation analog-to-digital converters (SA-ADCs). In the proposed scheme, not only the switching energy consumed within the first three comparisons is less than zero, but also other comparisons are made with the low-power monotonic method. Therefore, the switching energy of the capacitive array, including the consumed energy during the sampling phase, is reduced by 90.68% compared with the conventional counterpart. Moreover, since the variation of the input common-mode voltage of the employed comparator is only 0.125Vref, where Vref is the reference voltage of the ADC, the required comparator’s performance can be much more relaxed leading to more power saving. Post-layout simulation results of a 10-bit 1-MS/s SA-ADC in a 0.18-µm CMOS technology show a signal-to-noise-and-distortion ratio (SNDR) of 61 dB, a spurious-free dynamic range (SFDR) of 79.8 dB, and an effective number of 9.84 bits. The ADC consumes 35.3 µW with a 1.8-V supply and achieves a Figure-of-Merit (FoM) of 38.5 fJ/conversion-step.
Original languageEnglish
Pages (from-to)15-20
Number of pages6
JournalMicroelectronics Journal
Volume61
DOIs
Publication statusPublished - 2017

Keywords

  • Successive approximation ADC
  • Capacitive-array DAC
  • Capacitor switching technique
  • Power dissipation

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