Feedforward amplifier

Details Feedforward amplifier Feedforward amplifier

1997-09-30

1998-11-03

Mottola, Steven

Amplifiers

With pilot frequency control means

330151, H03F 366, H03F 126

Patent

active

058314784

ABSTRACT:
A method and apparatus in a feedforward amplifier (100) includes a summer (293) summing the desired signal (12) with a pair of tag signals (241, 242). An error signal (226) is coupled with a delayed version of the summed signal (48). The phase and amplitude of signals (226, 237) are adjusted according to a first and second gradient decent controllers (221, 231) output signal (225) which is based on the first DC signal (224) and output signal (235). The output signal (235) is based on the detected power level of a leaked signal at the output coupler (62). The adjustment of the input signal (237) to the second amplifier, when the detected power level fluctuation exceeds a predetermined threshold level, is repeated. The tag signals (241) are produced in phase lock with the sweeping detecting (222) function.

REFERENCES:
patent: 5130663 (1992-07-01), Tattersall
patent: 5166634 (1992-11-01), Narahashi et al.
patent: 5576659 (1996-11-01), Kenington et al.
patent: 5610554 (1997-03-01), Avari
patent: 5724344 (1998-03-01), Beck

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