Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1982-09-23
1984-08-14
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330136, 330277, H03F 132
Patent
active
044659806
ABSTRACT:
A predistortion circuit for a radio frequency power amplifier which has gain and phase shift characteristics that are non-linear as a function of power level of an RF input signal. The circuit includes a dual gate FET, with a drain coupled to the power amplifier. A modulated RF input signal is applied to an inductive matching network which is coupled to the signal gate of the FET. A modulating envelope detected version of the input signal is applied to a video amplifier which is coupled to the FET control gate. The signal applied to the control gate varies the gain of the FET as a function of input signal to compensate for the non-linear gain characteristic of the power amplifier and in conjunction with the matching network causes a phase change of the signal through the predistortion circuit to compensate for the non-linear phase characteristic of the power amplifier.
REFERENCES:
patent: 2999986 (1961-09-01), Holbrook
patent: 4068186 (1978-01-01), Sato et al.
patent: 4122399 (1978-10-01), Heiter et al.
patent: 4141023 (1979-02-01), Yamada
patent: 4241316 (1980-12-01), Knapp
patent: 4283684 (1981-08-01), Satoh
patent: 4291277 (1981-09-01), Davis et al.
Dual Gate GaAs M.E.S.F.E.T. Phase Shifter with Gain at 12 GHz, Electronics Letters, 3rd Jul. 1980, vol. 16, No. 14.
Dual-Gate Mesfet Variable-Gain Constant-Output Power Amplifier, IEEE Transactions on Microwave Theory and Techniques, vol. MTT-29, No. 3, Mar. 1981.
Huang Ho-Chung
Kumar Mahesh
Sechi Franco N.
Mullins James B.
RCA Corporation
Smiley R. E.
Tripoli J. S.
Troike R. L.
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