PHASE CONTROL METHOD OF NEGATIVE FEEDBACK AMPLIFIER AND NEGATIVE FEEDBACK AMPLIFIER USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a negative feedback amplifier phase controlling method which is capable of detecting a phase shift and adjusting the phase of local signals without using a phase control circuit composed of a high-accuracy phase difference detection circuit and a pulse circuit in a negative feedback amplifier of Cartesian loop system in which the amplifier is set stable by adjusting the phase shift of local signals. SOLUTION: A spurious power generated by a phase shift is detected, the detected spurious power is inputted into a phase control unit, and the phase control unit outputs control information which diminishes the spurious power into a phase shifter so as to adjust the amount of phase shift in the phase shifter.