A radio frequency (RF) amplifier circuit includes a field effect transistor (FET) (e.g., a FET belonging to a III-V FET enhancement group), where the FET includes a gate terminal coupled to an RF input node. The circuit further includes a prematch and biasing network coupled between a bias voltage node and the RF input node. The prematch and biasing network includes a nonlinear gate current blocking device configured to block a current from flowing between the bias voltage node and the RF input node.