Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2005-02-15
2005-02-15
Nguyen, Patricia (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S149000
Reexamination Certificate
active
06856196
ABSTRACT:
A distortion compensator that compensates for distortion arising in a main amplifier10that amplifies a signal effectively compensates for third order distortion which is unbalanced between the higher frequency band and lower frequency band. An amplitude detector3detects the level of a signal subject to amplification and a signal level change direction detection means7detects the direction of change in the level of the signal. A signal level change control means4-8stores the correspondence between the signal level and the mode of changing the signal in order to compensate for distortion for when the direction of change in the signal level is positive and when it is negative, and controls a signal change means9so that the amplitude and phase of the signal is changed in a mode of changing the signal corresponding to the detected direction of change in the signal level and the detected signal level. A signal change control content updating means11-13updates the content of this correspondence so that the distortion contained in the signal after amplification is reduced.
REFERENCES:
patent: 3644830 (1972-02-01), Ragsdale
patent: 3731199 (1973-05-01), Tazaki et al.
patent: 6201841 (2001-03-01), Iwamatsu et al.
patent: 6388518 (2002-05-01), Miyatani
Funada Kiyoshi
Hongo Naoki
Horaguchi Masato
Miyatani Tetsuhiko
Okubo Yoichi
Hitachi Kokusai Electric Inc.
Nguyen Patricia
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