Non-linearity compensating circuit for high-frequency amplifiers

Details Non-linearity compensating circuit for high-frequency amplifiers Non-linearity compensating circuit for high-frequency amplifiers

1979-04-16

1981-08-11

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330124R, 330149, 330286, 330295, H03F 132, H03F 316

Patent

active

042836840

ABSTRACT:
The present invention relates to a non-linearity compensating circuit for high-frequency amplifiers comprising a branch coupler for dividing the input signal into two components, two high-frequency amplifiers, one operating in the non-linear region, the other operating in the linear region, and each receiving one of the two signal components from said branch coupler, and a signal synthesizing circuit for taking the vectorial sum of the two antiphase signals from the two amplifiers whereby the non-linearity compensating circuit provides an input/output characteristics which is just the opposite of the input/output characteristics of the high-frequency amplifier to be compensated. Basically, the non-linearity compensating circuit according to the present invention does not require long delay lines, variable attenuators or variable phase-shifters of a special design so that the whole circuit can be constructed in a microwave integrated circuit form which has a reduced power loss.

REFERENCES:
patent: 4068186 (1978-01-01), Sato et al.
patent: 4122399 (1978-10-01), Heiter et al.
"Mini FET Amps Bandaid Systems from 4-18 GHz", Microwave Systems News, vol. 7, No. 2, p. 73, Feb. 1977.

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