A 0.6-V delta-sigma modulator with subthreshold-leakage suppression switches

Hyungdong Roh, Hyoungjoong Kim, Youngkil Choi, Jeongjin Roh, Yi Gyeong Kim, Jong Kee Kwon

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


A 0.6-V 34-μW delta-sigma modulator implemented by using a standard 0.13-μm complementary metaloxidesemiconductor technology is presented. This brief analyzes a subthreshold-leakage current problem in switched-capacitor circuits and proposes subthreshold-leakage suppression switches to solve the problem. To verify the operation of the subthreshold-leakage suppression switches, two different fifth-order deltasigma modulators are implemented with conventional switches and new switches. The input feedforward architecture is used to reduce the voltage swings of the integrators. A high-performance low-quiescent amplifier architecture is developed for the modulator. The modulator, with new switches, achieves a dynamic range of 83 dB, a peak signal-to-noise ratio of 82 dB, and a peak signal-to-noise-plus-distortion ratio of 81 dB in a signal bandwidth of 20 kHz. The power consumption is 34 μWfor the modulator, and the core chip size is 0.33 mm2.

Original languageEnglish
Article number5299254
Pages (from-to)825-829
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number11
Publication statusPublished - 2009 Nov


  • Analog-to-digital converter (ADC)
  • Deltasigma modulator
  • Harmonic distortion
  • Leakage current
  • Signal-to-noiseplus-distortion ratio (SNDR)
  • Switched-capacitor circuit

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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