A 0.7-V 400-μW 16-bit audio sigma-delta modulator with a modified tracking quantizer

Majid Yaghoubi, Mehdi Saberi, Reza Lotfi

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review


In this paper a low-power audio ΣΔ modulator under 0.7 V supply is proposed. The proposed structure uses a second order modulator with cascade integrator feedback (CIFB) and half-delayed input-feedforward architectures. In order to avoid the extremely scaling the loop filter coefficients in the CIFB ΣΔ modulator with tracking quantizer, the proposed modulator employs a novel difference-tracking multi-bit quantizer. Since the maximum step size of the proposed quantizer output signal is considered 3VLSB, compared with the conventional counterpart, a larger noise transfer function (NTF) gain can be allowed leading to a considerable reduction in the complexity and power consumption of the modulator. Simulation results of the proposed modulator in a 0.18-μm CMOS technology confirm that an SNDR of 97.9 dB is achieved for a 20-kHz signal bandwidth at the cost of 400 μW power consumption when the supply voltage is only 0.7 V.
Original languageEnglish
Title of host publication24th Iranian Conference on Electrical Engineering, ICEE 2016
Place of PublicationPiscataway
Number of pages6
ISBN (Print)978-1-4673-8789-7
Publication statusPublished - 2016


  • difference-tracking quantizer
  • Sigma-delta modulation
  • low voltage
  • low power

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