The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2000
Filed:
Aug. 11, 1998
Applicant:
Inventors:
Hiroshi Kishida, Hachiouji, JP;
Ken Takei, Hachiouji, JP;
Hiroshi Okabe, Kokubunji, JP;
Kenji Sekine, Nishitama-gun, JP;
Kazuyuki Hori, Ebina, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330151 ; 330 52 ;
Abstract
An improved feedforward amplifier capable of enhancing accuracy of extraction of an error signal corresponding to a distortion component while preventing outflow of an pilot signal. A switch is disposed between a pilot signal oscillator and a third power combiner for superimposing the pilot signal on an output signal from a main amplifier, and third control means is connected with the switch so that the switch is opened at the time of error signal extraction and closed at the time of error signal elimination.