Calibration of offset, gain and phase errors in M-channel time-interleaved analog-to-digital converters

摘要: Techniques for correcting component mismatches in an M-channel time-interleaved Analog to Digital Converter (ADC). In order obtain error measure offset, gain or phase, errors, outputs from each ADC are either summed averaged over N o samples. Calling of the sums averages as X k where k=1, 2, . , M, there M such values a result. A single value representing mean these values, is chosen reference value. The and phase errors different ADCs then obtained −X sign offset error, i.e., (X ), used drive adaptive algorithm whose output represents correction corresponding ADC. gain, fed array Digital-to-Analog converters (DACs) voltages currents that directly indirectly controls setting individual Thus, signals algorithms operating conjunction with DACs providing control ADCs. certain embodiments, spur frequencies can be reduced use notch filters.