Automatic gain control feedback amplifier

摘要

Disclosed is an automatic gain control feedback amplifier that can arbitrarily control a gain even when a difference in input signal is large. The automatic gain control feedback amplifier includes: an amplification circuit unit configured to amplify voltage input from an input terminal and output the amplified voltage to an output terminal; a feedback circuit unit connected between the input terminal and the output terminal and including a feedback resistor unit of which a total resistance value is determined by one or more control signals and a feedback transistor connected to the feedback resistor unit in parallel; and a bias circuit unit configured to supply predetermined bias voltage to the feedback transistor.

主权项

1. An automatic gain control feedback amplifier, comprising:
an amplification circuit unit configured to amplify voltage input from an input terminal and output the amplified voltage to an output terminal; a feedback circuit unit connected between the input terminal and the output terminal and including a feedback resistor unit of which a total resistance value is determined by one or more control signals and a feedback transistor connected to the feedback resistor unit in parallel; and a bias circuit unit configured to supply predetermined bias voltage to the feedback transistors; wherein the amplification circuit unit includes
a first transistor of which a base is connected to the input terminal and an emitter is grounded,a first resistor of which one end is connected to a collector of the first transistor and the other end is connected to a power supply,a second transistor of which a base is connected to the collector of the first transistor, a collector is connected to the power supply, an emitter is connected to the output terminal, anda second resistor of which one end is connected to the output terminal and the other end is grounded.