A power amplifier circuit includes one or a plurality of amplification stages. A first amplification stage includes a first amplifier and a second amplifier that amplify a differential signal, a first capacitor electrically connected between an output terminal of the first amplifier and an input terminal of the second amplifier, a second capacitor electrically connected between an input terminal of the first amplifier and an output terminal of the second amplifier, a first resonant circuit and a first resistor that are electrically connected in series with each other and are electrically connected between the output terminal and the input terminal of the first amplifier, and a second resonant circuit and a second resistor that are electrically connected in series with each other and are electrically connected between the output terminal and the input terminal of the second amplifier.

Aspects of the present disclosure provide a circuit configured to adjust an input impedance of an amplifier such as a low-noise amplifier. In certain aspects, the circuit is coupled to a node, wherein the node is between a first transistor and a second transistor of the amplifier. The circuit may include an inductor and a capacitor coupled in series, wherein the inductor is coupled with one or more load inductors of the amplifier through negative magnetic coupling.