A Timing Skew Calibration Method for Time-Interleaved FATI ADCs

摘要

A method to calibrate the timing skew of flash-assisted time-interleaved analog-to-digital converters is proposed. The calibration is performed in two steps and is composed of a variance based and of an auto-correlation based timing-skew estimation. Both estimation phases are performed in the digital domain and require low hardware. In addition, channel randomization is facilitated with the use of the proposed method. Behavioral simulations have demonstrated that the method greatly improves the ADC performance and is effective up to the Nyquist frequency.