Patent ID: 7511577

Claim:
A DC coupled microwave amplifier output stage for a signal generator comprising: a first Bias T having an input for receiving an AC input signal connected to an input of the amplifier output stage, a DC signal path, and an AC signal path; an amplifier having an input connected to the AC signal path of the first Bias T and having an output; a second Bias T having an input connected to the output of the amplifier, a DC signal path, and an output providing the output of the amplifier output stage; and a DC bias bypass circuit having a first terminal connected to the DC signal path of the first Bias T, and a second terminal connected to the DC signal path of the second Bias T, wherein the DC bypass circuit adds DC bias voltage to an AC voltage provided from the amplifier based on DC bias voltage on the first Bias T to provide a DC offset signal at the output of the amplifier stage.