Patent ID: 9537458
Date: 2017-01-03
CPC Classifications: H03F,H03G

Claim:
1. A feedback amplifier comprising: an amplifier circuit configured to amplify an input signal input from an input terminal and output the amplified input signal to an output terminal; a feedback circuit disposed between the input terminal and the output terminal, and configured to determine a feedback resistance value to be applied to a signal output to the output terminal, and to control a gain of the amplifier circuit by adjusting the input signal on the basis of a bias voltage applied with the feedback resistance value determined; a bias circuit configured to generate the bias voltage; a packet signal sensor, including a comparator, configured to generate a fixed resistance control signal for controlling a fixed resistance value included in the feedback resistance value through a comparison between the output from the output terminal and a minimum signal level by the comparator, the packet signal sensor outputting the fixed resistance control signal having a HIGH output and a LOW output respectively in response to the output from the output terminal being bigger and smaller than the minimum signal level; and a fixed resistance controller configured to control the fixed resistance value included in the feedback resistance value in response to the fixed resistance control signal.