A current mode multi-channel Wilkinson ADC

Nambiar, Neena; Blalock, Benjamin J.; Ericson, M.N.; Kao, Min H.

doi:10.1109/icses.2008.4673344

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2009

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Cited by 5 publications

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“…Multi-channel ADCs are required in sensor systems where data from multiple channels are digitized simultaneously [1]. In many sensor systems, output signals are provided as a current rather than a voltage.…”

Section: Introductionmentioning

confidence: 99%

A novel current-mode multi-channel integrating ADC

Nambiar

Blalock

Ericson

2009

Analog Integr Circ Sig Process

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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 lA. 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.

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Section: Introductionmentioning

confidence: 99%