Amplifiers – With pilot frequency control means
Patent
1999-06-11
2000-12-19
Mottola, Steven J.
Amplifiers
With pilot frequency control means
330151, H03F 366
Patent
active
061632104
ABSTRACT:
A feed-forward amplifier is provided, which can implement satisfactory linearity immediately after its activation. The amplifier has a high productivity and exhibits less long term fluctuations of its characteristics during the operation. In the feed-forward amplifier, the transfer function of a path from an input terminal to a directional coupler via a main amplifier and the transfer function of a path from the input terminal to the directional coupler via a first delay means are automatically controlled so as to be equal in amplitude but anti-phase relative to each other. The transfer function of a path from the main amplifier to an output terminal via a second delay means and the transfer function of a path from the main amplifier to the output terminal via an auxiliary amplifier are automatically controlled so as to be equal in amplitude but anti-phase relative to each other. Still further, at the time of the activation of the feed-forward amplifier, control values of a first vector adjuster are set to values stored in a first nonvolatile memory in accordance with a temperature measured in the vicinity of the main amplifier by a first temperature sensor. Control values of a second vector adjuster are set to values stored in a second nonvolatile memory in accordance with a temperature measured in the vicinity of the auxiliary amplifier by a second temperature sensor.
REFERENCES:
patent: 4394624 (1983-07-01), Bauman
patent: 5386198 (1995-01-01), Ripstrand et al.
patent: 5977826 (1999-11-01), Behan et al.
"Digital Radio Communications," Masayoshi Muroya and Heiichi Yamamoto and published by Sangyo Tosho, p. 168, publication date unknown. (See specification p. 1.).
European Search Report (in English) issued Oct. 21, 1999 in a related application.
Mottola Steven J.
NEC Corporation
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