Blind adaptive digital background calibration technology of offset in Time-Interleaved ADC

This paper introduces a blind adaptive digital background calibration method designed to correct errors due to offsets between channels in time-interleaved analog-to-digital converters (TI ADCs). By using the DC voltage of one ADC channel as a reference, the method calibrates the offset voltages of the other channels. This approach is notable for its lack of dependence on input signal information and its ability to adapt to variations in channel offsets. A 1 GHz, 12-bit dual-TI ADC is simulated using Simulink to evaluate the effectiveness of the proposed method. The results demonstrate that, despite a 10% channel offset, significant performance improvements were achieved. The Signal-to-Noise and Distortion Ratio (SNDR) increased from 29.4 dB to 68.1 dB, and the Effective Number of Bits (ENOB) improved from 4.59 bits to 11.01 bits. Furthermore, the calibration results remained stable and consistent across an offset range of 0% to 25%.