FIELD: power-factor correction. SUBSTANCE: device for correcting phase angle (θ) in feedback circuit of power amplifier using orthogonal feedback in final stage of transmitter has facilities 18, 20, 22 for quadrature modulation of complex differential signal equal to difference between complex input signal 1, Q and respective feedback complex signal IF,QF, complex modulating signal for shaping first real modulated signal IFE, and facilities 22, 32, 34 for quadrature demodulation of output signal IFF of power amplifier by complex demodulating signal to shape complex feedback signal IF,QF. Facilities 36 are provided to determine phase shift angle θ brought in by feedback circuit between first and second IFF signals and between quadrature components of first IFF signal and second IFF signal. There are also facilities 38 for phase shift of complex modulating signal through value compensating for phase-shift angle (θ) brought in by feedback circuit. EFFECT: improved correction of phase angle of complex modulating signal. 7 cl, 2 dwg
