Direct input radio frequency complex analog to digital converter with corrective factors

摘要

A direct radio frequency complex analog to digital converter (CADC) device provides corrective factors including a plurality of time-interleaved low speed ADCs, wherein each ADC corresponds to an ADC channel. A phase corrective factor is calculated for each ADC channel. An amplitude corrective factor is calculated for each ADC channel. The phase and amplitude corrective factors are applied to complex bandpass filter coefficients to produce filter coefficients corrected for the phase and amplitude imbalances between ADCs. Digital output of each ADC channel is filtered by a complex bandpass filter using the corrected filter coefficients to produce corrected in-phase and quadrature output at baseband. Harmonics produced by the ADCs are canceled by filtering ADC outputs in a first bandpass filter to an intermediate frequency such that the harmonics fall outside the band of interest, a second filter is applied to attenuate the harmonic and produce a signal output at baseband.