On first-order compensation of timing mismatch in two-channel TIADCs

In this paper, two first-order compensation strategies for timing mismatch in two-channel time-interleaved analog-to-digital converters (TIADCs) are analyzed, and expressions for the spurious-free dynamic range (SFDR) after compensation are derived. The derived expressions reveal that the strategy where both channels are compensated to match each other, using half the value of the mismatch with different signs, achieves a substantially greater SFDR than the strategy where only one channel is compensated to match the other (reference) channel. This is because, after compensation, the remaining aliasing distortion is shown to be of third order in the former strategy whereas it is of second order in the latter. Simulations included demonstrate the validity of the derived expressions.
Funding: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [61701509]; Science and Technology on Analog Integrated Circuit Laboratory [JCKY2019210C027]