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Offset-Calibration With Time-Domain Comparators Using Inversion-Mode Varactors
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DOI：10.1109/TCSII.2019.2904100.png)
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摘要
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This brief presents a differential time-domain comparator formed by two voltage controlled delay lines, one per input terminal, and a binary phase detector for comparison solving. The propagation delay through the respective lines can be adjusted with a set of digitally controlled inversion-mode varactors. These varactors provide tuning capabilities to the comparator; feature which can be exploited for offset calibration. This is demonstrated with the implementation of a differential 10-bit successive approximation register analog-to-digital converters. The design, fabricated in a 0.18-mu m CMOS process, includes an automatic mechanism for adjusting the capacitance of the varactors in order to calibrate the offset of the whole converter. Correct functionality was measured in all samples.
Keyword:
Offset calibration
time-domain comparator
SAR-ADC
inversion-mode varactors
forward calibration
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2.5W
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