Circuit for stabilizing RF amplifier

Amplifiers – With semiconductor amplifying device – Including field effect transistor

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Details

330286, 330302, H03F 316, H03F 360, H03F 3191

Patent

active

054062241

ABSTRACT:
A high-frequency amplifier has a semiconductor element for amplifying a high-frequency signal, an input matching circuit connected to an input side of the semiconductor element, and an output matching circuit connected to an output side of the semiconductor element. A stabilizing circuit is connected to at least one of a signal input path between the input matching circuit and the semiconductor element, and a signal output path between the semiconductor element and the output matching circuit. The stabilizing circuit includes a first element having a first end which is short-circuited with respect to a high frequency, a parallel resonant circuit connected in series with a second end of the first element and performing parallel resonance at an operating frequency of the high-frequency amplifier, and a second element connected to a side of the parallel resonant circuit which is opposite to the first element. Values of the first element and the second element are chosen so that an admittance of the high-frequency amplifier which occurs at a frequency of possible oscillation of the high-frequency amplifier will be within a constant-conductance circle in a Smith chart which denotes a stable condition of the high-frequency amplifier.

REFERENCES:
patent: 5089790 (1992-02-01), Mochizuchi et al.
"Microwave Transistor Amplifiers", pp. 84-87 & pp. 95-102 no date.
"Transmission Circuit" by R. Sato; pp. 29-87 (w/partial English translation) no date.

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