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A 6.4 MS/s 13 b ADC with a low-power background calibration for DAC mismatch and comparator offset errors is presented. Redundancy deals with DAC settling and facilitates calibration. A two-mode comparator and 0.3 fF capacitors reduce power and area. The background calibration can directly detect the sign of the dynamic comparator offset error and the DAC mismatch errors and correct both of them simultaneously...
Wireless standards, e.g., 802.15.4g, need high-resolution ADCs (>10b) with very low power and MS/s sampling rates. The SAR ADC is well known for its excellent power efficiency. However, its intrinsic accuracy (DAC matching) is limited up to 10 to 12b in modern CMOS technologies [1]. Scaling up the device dimensions can improve matching but it deteriorates power-efficiency and speed. Alternatively,...
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