Digital correction of frequency response mismatches in 2-channel time-interleaved ADCs using adaptive I/Q signal processing (original) (raw)

A novel adaptive compensation architecture for the frequency response mismatch of 2-channel time-interleaved ADC (TI-ADC) is proposed for developing highperformance self-adaptive systems. The proposed approach overcomes the existing methods in the sense that the TI-ADC mismatch identification can be performed without allocating a region where only the TI-ADC mismatch spurs are present. This is accomplished via mapping the TI-ADC problem into an I/Q mismatch problem which allows deploying complex statistical signal processing. As proof of concept, the compensation architecture is demonstrated and tested on a 16-bit TI-ADC measured hardware data. Keywords Time-interleaved ADC Á Digitally assisted analog (DASA) Á Circularity Á Frequency response mismatch identification Á Complex I/Q signal processing This work was partially presented in IEEE MWSCAS 2013. Simran Singh is carrying out his doctoral studies at