Delta-sigma D/A converter using binary-weighted digital-to-analog differentiator for second-order mismatch shaping

Heng Yu Jian*, Zhiwei Xu, Mau-Chung Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

A multibit digital-analog (D/A) differentiator is used in the forward correction path of a dual-truncation delta-sigma (ΔΣ) D/A converter (DAC) to obtain the desired second-order noise-shaping function for converting mismatch-induced in-band quantization noise to out-of-band frequencies. The multibit D/A differentiator can be configured by embedding binary-weighted current-steering DAC elements into digital differentiators without concern of linearity. In simulations, the newly proposed DeltaSigma DAC is 20 dB more effective in noise reduction than widely adopted first-order noise-shaping methods under the identical mismatch conditions of DAC elements (2% in average global mismatch and 0.3% in adjacent element mismatch). This method also offers advantages of compact circuit implementation with smaller routing area and less power consumption over those of thermometer-coded or digital signal processing based counterparts with the same second-order mismatch shaping.

Original languageEnglish
Pages (from-to)6-10
Number of pages5
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume55
Issue number1
DOIs
StatePublished - 1 Dec 2008

Keywords

  • D/A differentiator (DAD)
  • Delta-sigma (Δ Σ) modulation
  • Digital-analog (D/A) conversion
  • Mismatch shaping
  • Noise cancellation
  • Quantization noise

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