Control circuit for automatically controlled feed forward nonlin

Details Control circuit for automatically controlled feed forward nonlin Control circuit for automatically controlled feed forward nonlin

1993-02-11

1994-07-05

Mullins, James B.

Amplifiers

With amplifier bypass means

330149, 330 52, H03F 100

Patent

active

053270967

ABSTRACT:
A control circuit for an automatically controlled feed forward nonlinear distortion compensation amplifier. The control circuit controls a distortion detection loop and a distortion removal loop. The distortion detection loop is a loop for feeding forward input to a main amplifier into a first directional coupler. The distortion removal loop is a loop for feeding forward distortion elements into a second directional coupler. The main amplifier is preceded by a variable attenuator and a variable phase shifter. A variable attenuator and a variable phase shifter are also located in a feed forward path to the second directional coupler. The control circuit controls the variable attenuator and the variable phase shifter preceding the main amplifier for detecting the distortion elements. The control circuit controls the variable attenuator and the variable phase shifter located in the feed forward path to the second directional coupler for removing the distortion elements. A temperature compensation signal and an adjustment signal are added to a control signal by each adder provided at the output stage of the control circuit.

REFERENCES:
patent: 4885551 (1989-12-01), Myer
patent: 5157345 (1992-10-01), Kenington et al.
patent: 5166634 (1992-11-01), Narahashi et al.

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