Amplifier circuit and multistage amplifier circuit

摘要

An amplifier circuit includes a first FET of an enhancement type having a gate supplied with an input signal and a gate bias voltage and a drain via which an amplified output signal is output, and a second FET of the enhancement type having a drain connected to a drain voltage source, a source connected to the drain of the first FET, and a gate supplied with a control signal for controlling the drain voltage supplied to the first FET. <IMAGE>