A novel current-mode multi-channel integrating ADC

Neena Nambiar, Benjamin J. Blalock, M. Nance Ericson

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A novel current-mode multi-channel ADC has been designed, fabricated, and characterized in a 0.5-lm bulk CMOS process. The ADC utilizes a Wilkinson architecture with current-mode comparators and is capable of supporting multiple channels with an input current range of 10-150 μA. The main blocks in the ADC include a current ramp generator with active current mirrors, multiple current comparators, and a 12-bit Gray code counter. A novel architecture Gray code counter supports high frequency counting. For sampling rates up to 10 kHz, measurement results are presented including integral nonlinearity and differential nonlinearity. A per-channel power consumption of less than 2 mW using a Wilkinson architecture with 4 channels was observed. This work represents the first published current-mode, multi-channel Wilkinson ADC.

Original languageEnglish
Pages (from-to)283-291
Number of pages9
JournalAnalog Integrated Circuits and Signal Processing
Volume63
Issue number2
DOIs
StatePublished - May 2010
Externally publishedYes

Keywords

  • Current mode
  • Gray code counter
  • Multi-channel ADC
  • Ramp generator

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