POWER AMPLIFIER SYSTEM WITH AN OUTPUT CONTROL FUNCTION, CAPABLE OF CONTROLLING THE OUTPUT OF A POWER AMPLIFIER BY USING A BIAS CURRENT AND A BIAS VOLTAGE

摘要

PURPOSE: A power amplifier system with an output control function is provided to minimize the loss of a voltage and a current according to the current detection by detecting the bias current.;CONSTITUTION: A power amplifier(10) receives a bias current and a bias voltage from a power voltage source. The gain of the power amplifier is controlled according to the size of the bias current and the bias voltage. A voltage detection controller(20) controls the size of the bias voltage by detecting the size of the bias voltage provided to the power amplifier. A current detection controller(30) detects the size of the bias current provided to the power amplifier as the size of the corresponding current. The current detection controller controls the size of the bias current by comparing the size of the preset reference voltage with the voltage corresponding to the size of the bias current.;COPYRIGHT KIPO 2010