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High-speed high-resolution Analog-to-Digital Conversion is the key part forwaveform digitization in physics experiments and many other domains. This paperpresents a new fully digital correction of mismatch errors among the channelsin Time Interleaved Analog-to-Digital Converter (TIADC) systems. We focus oncorrection with wide-band input signal, which means that we can correct themismatch errors for any frequency point in a broad band with only one set offilter coefficients. Studies were also made to show how to apply the correctionalgorithm beyond the base band, i.e. other Nyquist zones in the under-samplingsituation. Structure of the correction algorithm is presented in this paper, aswell as simulation results. To evaluate the correction performance, we actuallyconducted a series of tests with two TIADC systems. The results indicate thatthe performance of both two TIADC systems can be greatly improved bycorrection, and the Effective Number Of Bits (ENOB) is successfully improved tobe better than 9.5 bits and 5.5 bits for an input signal up to the bandwidth(-3dB) range in the 1.6-Gsps 14-bit and the 10-Gsps 8-bit TIADC systems,respectively. Tests were also conducted for input signal frequencies in thesecond Nyquist zone, which shows that the correction algorithms also work wellas expected.

Mismatch error correction for time interleaved analog-to-digital converter over a wide frequency range