Patent
FET Amplifier comprising a circulator for an input signal as an isolator
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TLDR
In this article, a series connection of a coaxial-to-waveguide converter and a circulator for supplying an FET with an input signal of a wide microwave band, such as an octave band between about 1 GHz and 12 GHz, a d.c.Abstract:
In an FET amplifier comprising a series connection of a coaxial-to-waveguide converter and a circulator for supplying an FET with an input signal of a wide microwave band, such as an octave band between about 1 GHz and 12 GHz, a d.c. bias voltage is applied to the FET through the circulator from a terminator therefor. For this purpose, the terminator comprises an inner and an outer conductor insulated ohmically from each other and shunted for the microwave band, as by a capacitor of several picofarads. Preferably, a resistor and a third conductor are successively connected to the inner conductor with the capacitor placed at an end of the resistor remoter from the inner conductor and with a dummy for the input signal positioned between the outer and the third conductors.read more
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References
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Microwave GaAs FET amplifier circuit
James A. Irvine,Peter Torrione +1 more
TL;DR: In this paper, a network is coupled to the gate electrode of a FET for generating a negative gate electrode voltage having a selected nominal value for minimizing intermodulation distortion of the FET and/or a value varying with respect to the nominal value directly proportional to temperature changes to provide a constant gain for the fET.