A blind frequency response mismatch correction algorithm for 4-channel Time-Interleaved ADC

A novel approach for the frequency response mismatch mitigation of a 4-channel Time-Interleaved ADC (TI-ADC) is proposed which enables the interleaving mismatch identification to be performed in a fully blind online manner. This is accomplished via generating an appropriate complex valued signal from the real valued TI-ADC output signal which allows deploying complex statistical signal processing methods for the mismatch identification in a manner similar to the I/Q imbalance correction. As proof of concept, the compensation architecture is implemented, demonstrated and tested using real RF-sampling 4-channel TI-ADC hardware data, evidencing spur reduction below 80 dBFS.