sheldon
|
Another thing that you should do is review the discussions digital assist, calibration, to eliminate the accuracy issues introduced by the capacitor variation and parasitics. Calibration is pretty much required when using a split cap DAC for high accuracy applications since the series cap is not a unit capacitor, see Yasuhide Kuramochi, Akira Matsuzawa, and Masayuki Kawabata "A 0.05-mm2 110-uW 10-b Self-Calibrating Successive Approximation ADC Core in 0.18-um CMOS" A-SSCC, 8-1, pp 224-227, Korea, Jeju, Nov, 2007
as an example of calibration. The next year there was a paper on compensating for dynamic comparator offset at the same conference
Sheldon
|