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 language | English |
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Pages (from-to) | 283-291 |
Number of pages | 9 |
Journal | Analog Integrated Circuits and Signal Processing |
Volume | 63 |
Issue number | 2 |
DOIs | |
State | Published - May 2010 |
Externally published | Yes |
Keywords
- Current mode
- Gray code counter
- Multi-channel ADC
- Ramp generator