A thermometer-like mismatch shaping technique with minimum element transition activity for multibit ΔΣ DACs

Arindam Sanyal, Peijun Wang, Nan Sun

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

This brief presents a novel mismatch shaping technique for multibit delta-sigma digital-to-analog converters (DACs). It uses the intrinsic quantization noise to randomize the element selection. Different from most existing mismatch shaping techniques that increase the element transition activity, the proposed technique keeps the same transition rate as that for the basic thermometer coding scheme. As a result, it produces much lower intersymbol interference (ISI)-induced distortions. Moreover, it does not produce tones and can high-pass shape the mismatch errors, unlike thermometer coding that produces large distortions due to static mismatch. An efficient hardware implementation based on the vector-quantizer mismatch shaping framework is also presented. Simulations show that the proposed technique can significantly improve DAC linearity in the presence of both ISI and mismatch errors.

Original languageEnglish (US)
Article number6823134
Pages (from-to)461-465
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Volume61
Issue number7
DOIs
StatePublished - Jul 2014
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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