Patent ID: 7804366

Claim:
A millimeter wave amplifier constructed on a substrate, comprising: a first amplifier stage; a first inter-stage coupling network, resonant at an operating frequency of the amplifier, that couples an output of the first amplifier stage to an input of a second amplifier stage a second inter-stage coupling network, resonant at the operating frequency, that couples an output of the second amplifier stage to an input of a third amplifier stage; a third inter-stage coupling network, resonant at the operating frequency, that couples an output of the third amplifier stage to an input of a fourth amplifier stage; a plurality of bias supply leads that couple a gate bias voltage and a drain bias voltage to each of the amplifier stages; and a plurality of resonant bias line filters, resonant at the operating frequency, connected between at least some of the bias supply leads and a ground plane wherein: the signal path through the first amplifier stage flows in a first direction, the signal path through the second amplifier stage flows in a second direction generally opposed to the first direction, and the signal path through the third amplifier stage flows in the first direction.