CIRCUIT FOR CONTROLLING A POWER AMPLIFIER, ESPECIALLY IN REFERENCE TO OUTPUTTING AN OUTPUT VOLTAGE OF THE POWER AMPLIFIER WHICH HAS A CERTAIN AMPLITUDE WITHOUT A BIG CHANGE IN AN AMPLITUDE

摘要

PURPOSE: A circuit for controlling a power amplifier is provided to be combined in a power detection end for measuring the amplitude of a voltage and a control end for controlling an amplification rate of a power amplifier, thereby obtaining a stable output voltage in amplitude. CONSTITUTION: A power amplifier(100) amplifies an inputted signal, and outputs the amplified signal. An input end inputs the signal to the power amplifier(100). An output end outputs the amplified signal from the power amplifier(100). A power detection end detects an output power outputted from the output end. A control end applies a control voltage to control the output voltage of the power amplifier(100). A controller(200) is disposed between the power detection end and the control end.