Amplifiers – Signal feedback – Plural amplifier channels
Patent
1986-02-03
1987-04-07
Mullins, James B.
Amplifiers
Signal feedback
Plural amplifier channels
330 53, 330124R, 330149, H03F 360, H03F 368
Patent
active
046564349
ABSTRACT:
An RF power amplifier for delivering power to a load including a first quadrature hybrid coupler driving two class C amplifiers operating with high input compression, a second quadrature hybrid coupler coupled to the outputs of the amplifiers, an attenuator, and a phase shifter. An impedance mismatch by the load causes phase-pulling of the amplifiers which reduces output to the load. This is compensated for by feeding an error signal, indicating the magnitude and phase of the phase-pulling of the two amplifiers, from the second quadrature hybrid coupler through the attenuator and the phase shifter back to the first quadrature hybrid coupler. The attenuated and phase shifted error signal adds to or is subtracted from the input signals to the two amplifiers. Therefore, one of the two amplifiers is driven with more signal and the other amplifier is driven with less signal to phase-push the two amplifiers to compensate for the phase-pulling to thereby increase the output to the load.
REFERENCES:
patent: 3202927 (1965-08-01), Ishimoto et al.
patent: 3371284 (1968-02-01), Engelbrecht
patent: 3571739 (1971-03-01), Seidel
patent: 3618126 (1971-11-01), Gerst et al.
patent: 3777275 (1973-12-01), Cox
patent: 3909742 (1975-09-01), Cox et al.
patent: 3911372 (1975-10-01), Seidel
patent: 4053848 (1977-10-01), Kleische
McLellan Scott W.
Mullins James B.
Raytheon Company
Sharkansky Richard M.
Thibodeau, Jr. David J.
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