Method and device for the correction of phase and amplitude errors for direct conversion receiving devices.

摘要

One of two IF signals (I,Q), provided by a pair of mixers receiving the angle modulated HF signal and local oscillator signals which are offset by 90 degrees, is used. The selected IF signal is multiplied with a correction factor (K1) to provide an amplitude-corrected signal. Sum and difference values are obtained from the latter and the uncorrected signal, one of the obtained values multiplied by a second correction factor, to provide a phase-corrected signal. Pref. the correction factors are provided by the quotient of the absolute differentials of the in-phase and quadrature components.