Abstract
A ref.ADC based two-step calibration algorithm is proposed for the timing mismatch between channels of time-interleaved ADC (TIADC). Firstly, the difference between the output of ref.ADC and sub-ADC at the same sampling period is used to estimate the timing mismatch, and a high-order Taylor interpolation algorithm is adopted to compensate it; Secondly, a calibration technique based on statistical principle is adopted to estimate the bandwidth mismatch introduced by the ref.ADC, and it can be compensated by the same Taylor interpolation algorithm; The final calibrated output is the mux of the timing and bandwidth mismatch compensated output. Applied to a four-channel 1Gs/s, 12-bit TI-ADC system, the simulation results show that, when the input signal frequency is 130MHz, after calibration, the signal-to-noise distortion ratio (SNDR) is increased from 29.77dB to 73.96dB, and the spurious free dynamic range (SFDR) is increased from 32.02dB to 98.44dB.
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