Amplifier circuit and photodetection device

Abstract

An amplifier circuit includes a plurality of gain stages that change a gain in each stage and include a first gain stage and a final gain stage, an output terminal that outputs a signal amplified by the plurality of gain stages, a negative input terminal connected to an input node of the first gain stage, a feedback circuit connected between an output node of the final gain stage and the negative input terminal, a first resistor connected between the output node of the final gain stage and the output terminal, an active load of the first gain stage including a first transistor, a second resistor connected to a gate or a base of the first transistor, and a capacitor connected between the gate or the base of the first transistor and the output node of the final gain stage.

Dependencies are inferred from the claim text.