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:
Sep. 11, 1990
Filed:
Oct. 20, 1987
Applicant:
Inventors:
Tomishige Yatsugi, Ibaraki, JP;
Hiroshi Toeda, Ibaraki, JP;
Tadashi Takamiya, Ibaraki, JP;
Norio Minami, Ibaraki, JP;
Isao Fukushima, Ibaraki, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Video Engineering, Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 67 ; 360 65 ;
Abstract
A preamplifier circuit for amplifying a video signal reproduced by a magnetic head includes a positive feedback circuit for reducing an input capacitance thereof. A negative feedback circuit may be added thereto for stabilizing an operation of the preamplifier.