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:
Aug. 26, 1997
Filed:
May. 15, 1995
Applicant:
Inventors:
Hidenori Minoda, Higashihiroshima, JP;
Hiroyuki Matsuoka, Higashihiroshima, JP;
Katsuaki Matsufuji, Higashihiroshima, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
327159 ; 327160 ; 327156 ; 327150 ; 327147 ; 327151 ; 331 / ; 375376 ;
Abstract
A phase control circuit adjusts the width of a PLL clock signal so that a PLL clock signal generated from a master clock signal MCK is in synchronization with an EFM signal. A velocity detector detects offset in velocity by counting a pulse width of an EFM signal with a master clock signal MCK. The phase control circuit alters the pulse width of a PLL clock signal according to the detected offset in velocity to alter the average frequency of a PLL clock signal in proportion to offset of the rotational speed.