| 摘要 |
<p>PURPOSE:To stably adjust the balance even when the relationship is deviated by a method wherein a negative-feedback signal is generated on the basis of a voltage according to the phase difference of a received signal with reference to a reference signal and on the basis of a voltage according to the magnitude of the amplitude of the received signal. CONSTITUTION:The phase difference between a received signal and a reference signal is detected by a phase detection circuit 12, it is passed through an integrating circuit 13 so as to follow only a phase change due to a temperature change or the like, and it is input to a voltage-controlled phase-shifting circuit 14. Thereby, the phase of the reference signal after a phase-shifting operation is made to follow the received signal for a long period, and they are made to coincide with each other. The received signal after its differential amplification by a differential amplifier 5 is synchronously detected by a synchronous detection circuit 15 by the reference signal whose phase has been adjusted, and an amplitude component is extracted. It is passed through an integrating circuit 16, its output voltage is multiplied by the phase-adjusted reference signal by a voltage-controlled amplifier circuit 17, and the amplitude of the reference signal is adjusted. Then, it is passed through a band-pass filter 18, and a signal which exists steadily in the received signal is restored. The restored signal is input to a differential amplifier circuit 5, it is negatively fed back, and the received signal is converged to a balanced state.</p> |
