AUTOMATIC GAIN CONTROL FEEDBACK AMPLIFIER CAPABLE OF CONTROLLING A RESISTANCE VALUE OF A FEEDBACK RESISTOR PART USING ONE OR MORE CONTROL SIGNALS

摘要

PURPOSE: An automatic gain control feedback amplifier is provided to freely control a gain even when a difference of an input signal is great.;CONSTITUTION: An automatic gain control feedback amplifier (200) includes an amplifier circuit (210), a feedback circuit (220), and a bias circuit (230). The amplifier circuit amplifies a voltage inputted from an input terminal and outputs the voltage to an output terminal. The feedback circuit is connected between the input terminal and the output terminal. The feedback circuit includes a feedback resistor part (221) whose total voltage value is determined by one or more control signals and a feedback transistor connected to the feedback resistor part in parallel. The bias circuit provides a predetermined bias voltage to the feedback transistor.;COPYRIGHT KIPO 2013