Abstract: A complex digital sampling converter, for use with an IF demodulator, includes: an analog-to-digital converter (ADC) receiving the IF analog signal for conversion to a digital data stream by sampling at a sampling rate frequency substantially equal to four times the IF signal frequency; a digital mixer for converting the sampled data to baseband; a sorter for separating the interleaved sequential in-phase I data words and quadrature-phase Q data words into a pair of concurrent I and Q data word streams; and at least one of a circuit for removing the effects of any DC offset in the analog IF signal applied to the ADC, and a circuit for correcting misalignment errors in the concurrent I and Q streams.