Adaptive Calibration Method for Time-Interleaved ADCs

Abstract

This article presents an adaptive calibration method for time interleaved ADCs. This method is based on the use of the LMS algorithm to calibrate the channel gain and the Euler numerical integration method to compensate the offset voltage of the ADC channels and “data averaging”. The use of the Farrow filter for the time synchronization of ADC channels is corroborated. The degree of the Lagrange polynomial of the allpass Farrow filter is determined, which corresponds to the cubic interpolation. The results of simulation of the proposed method are presented, including spectral analysis of the output signal before and after calibration.