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This paper describes a new all-digital technique for calibration of themismatches in time-interleaved analog-to-digital converters (TIADCs) to reducethe circuit area. The proposed technique gives the first order approximation ofthe gain mismatches and sample-time mismatches, and employs first orderapproximation FIR filter banks to calibrate the sampled signal, which do notneed large number of FIR taps. In the case of a two-channel 12-bit TIADC, theproposed technique improves SINAD of simulated data from 45dB to 69dB, andimproves SINAD of measured data from 47dB to 53dB, while the number of FIR tapsis only 30. In the case of slight mismatches, 24-bit FIR coefficient issufficient to correct 12-bit signals, which makes it easy to implement thistechnique in hardware. In addition, this technique is not limited by the numberof sub-ADC channels and can be calculated in parallel in hardware, thesefeatures enable this technique to be versatile and capable of real-timecalibration.

A New All-Digital Background Calibration Technique for Time-Interleaved ADC Using First Order Approximation FIR Filters