Method and circuit for carrier control in a quadrature demodulator

The invention relates to a method and a circuit for carrier control in a quadrature demodulator, wherein a complex-value input signal (I, Q) is supplied to a mixer (1) to perform mixing with a mixing frequency (fm) to create a mixed signal (Ir, Qr), the mixed signal (Ir, Qr) is supplied to a processing section (s) to generate a processed signal (Ie, Qe), the processed signal (Ie, Qe) is supplied to phase measurement device (3) in order to measure a phase ( m) of the processed signal (Ie, Qe) and the measured phase ( m) is supplied to a phase controller (4) in order to control the mixing frequency (fm); wherein an idle time (z−d) is created at least during the processing in the processing section (2). To enable a fast switching-on transition, the mixing frequency (fm) is summed or integrated to create a mixing phase ( c), the mixing phase ( c) is used for the mixing operation, as well as fed back to the phase control (4, 23), and an error created by the feedback is compensated for with a time-delayed second feedback of the mixing phase ( c).