Power Amplifier With 9 to 13 dB of Gain From 65 to 146 GHz

A three-stage power amplifier has been developed, capable of operating without tuning, over a wide frequency band ranging well above 100 GHz. The original intended application of this circuit is as a driver amplifier for a passive frequency multiplier that would generate a local-oscillator signal in a submillimeter-wavelength heterodyne receiver. There is also a growing need for amplifier circuits like this one in other applications, including radar, imaging, scientific instrumentation, and communications.