AUTOMATIC FREQUENCY CONTROL IN SATELLITE COMMUNICATION

摘要

a power average circuit(10) detecting holding and a signal level of I(Inphase) and Q(Quadrature) data; a peak circuit(11) detecting and holding peak of a reference voltage supplied from the external; an adder(12) making the output voltage corresponding to the amplitude of the signal level by receiving the signal level from the power average circuit(10) through a non-inversion terminal and by receiving the reference voltage from the peak circuit(11) through an inversion terminal; and an integrator(13) outputting the control voltage controlling the gain of a variable gain amplifier(2).