CONTROL CIRCUIT FOR AUTOMATIC CONTROL FEED FORWARD NON-LINEAR DISTORTION COMPENSATING AMPLIFIER

摘要

PURPOSE:To realize temperature compensation with simple circuit configuration and to facilitate the control of an FF amplifier. CONSTITUTION:The operations of variable attenuators 14 and 24 and variable phase shifters 16 and 26 provided in a distortion detection loop 10 and a distortion removal loop 22 are controlled by an adder circuit 42. The adder circuit 42 adds a temperature compensating voltage or an adjusting voltage from a heat sensitive element to a control signal from an automatic control circuit 44 and defines that voltage as a control voltage. Since the temperature compensation is realized by the adder circuit 42, the most satisfactory control state is realized even in a free run state. It is not necessary to separately provide any variable attenuator or variable phase shifter for adjusting the FF amplifier. Further, since it is not necessary to separately adjust a main amplifier 18 or an auxiliary amplifier 28, the adjustment is facilitated.