A new background calibration technique for correcting timing-skew mismatch errors in time-interleaved analog-to-digital converter (ADC) is reported. In this approach, the time derivative of the input signal is directly sampled and utilized for skew calibration. Reference ADC equalization is used in tandem to correct any static mismatch errors. Behavioral simulations show 26 dB and 44 dB improvement in signal-to-noise plus distortion (SNDR) and spurious-free dynamic range (SFDR) performance, respectively.
['Benwei Xu', 'Yun Chiu']
Background calibration of time-interleaved ADC using direct derivative information