An amplifier system comprising an input matching network configured to receive an input signal from a signal source. The input matching network is configured to impedance match between the amplifier system and the signal source. An input transformer is configured to receive the impedance matched input signal and perform voltage step down and current step up. An amplifier is configured to receive and amplify an output signal from the input transformer to generate an amplified signal. A low winding ratio output transformer provides isolation between an antenna and amplifier. An output matching network is configured to impedance match to an antenna and provide voltage step up. The input transformer may have a ratio of 2N:N, such as 2:1 ratio. At least one center tap of the input transformer may connect to a bias voltage. The amplifier system may be configured for operation in the radio frequency band.