High frequency amplifier having stable amplification operation

Details High frequency amplifier having stable amplification operation High frequency amplifier having stable amplification operation

1992-05-04

1993-07-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330296, 330306, H03F 3193

Patent

active

052297322

ABSTRACT:
A selection unit, which is provided between an input matching unit and a high frequency amplification unit, is used to select a specific high frequency band to be amplified by the high frequency amplification unit from high frequency signals input from an input terminal. Further, an attenuation unit, which is provided between an input of the high frequency amplification unit and ground, is used to attenuate the input high frequency signals except for the specific high frequency band. Therefore, the specific high frequency band of the input high frequency signals is transferred from the input terminal to the high frequency amplification unit through the selection unit with a small loss, and the input high frequency signals except for the specific high frequency band are attenuated by the attenuation unit. Further, not only can stability of the high frequency amplification unit in the specific high frequency band used for the amplifier be realized, but stability of the high frequency amplification unit in other frequency bands except for the specific high frequency band can be also realized. Consequently, the high frequency amplifier does not oscillate and is not damaged.

REFERENCES:
patent: 3217265 (1965-11-01), Lungo
patent: 3443239 (1981-03-01), Schmitt
patent: 4028629 (1977-06-01), Ringland
patent: 4107621 (1978-08-01), Furutani et al.
patent: 4306200 (1981-12-01), Takayama
patent: 4379269 (1983-05-01), Ijichi
Horwitz, "Design Wideband UHF Power Amplifiers" Electronic Design 11, May 24, 1969, pp. 72-77.

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