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—A SAR ADC incorporates two VCOs and a TDC as a multi-bit quantizer to improve the conversion speed. Using background calibration and realized in 45-nm technology, the ADC exhibits an SNDR of 68 dB and an FOM of 8 fJ/conv. step at Nyquist. The conversion rate of SAR ADCs can be improved through the use of a multi-bit quantizer [1-3]. However, such an… (More)