Design of frequency‐interleaved ADC with mismatch compensation

Abstract

A frequency‐interleaving‐based multichannel analogue‐to‐digitial converter (ADC) with mismatch compensation is presented, which is immune from the time skew problem that exist in the time‐interleaved ADC. The channel mismatches, such as bandwidth mismatch, gain mismatch, offset mismatch and filter bank mismatch, are addressed and modelled in the reconstruction optimisation. A prototype of a four‐channel 1 GS/s 12 bit frequency‐interleaved ADC (FI‐ADC) is designed to demonstrate the mismatch compensation. Simulation results show that the mismatches in the FI‐ADC can be compensated effectively.