Abstruct-A 100-element hybrid grid amplifier has been fabricated. The active devices in the grid are custom-made pseudoransistor (pHEMT) differentialfor gain analysis and compare rid includes stabilizing resistors the grid has a peak gain of 10 a gain of 12 dB when tuned for andwidth is 15% at 9 GHz. The m~n i~u m noise figure is 3 dB. The maximum saturated output power is 3.7 W, with a peak power-added efficiency of 12%. are a significant improvement over previous grid ed on heterojunction bipolar transistors (HBT's).The maximum ljlput &=am E
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