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. 08, 1998
Filed:
Sep. 29, 1995
Terumi Takashi, Chigasaki, JP;
Naoki Satoh, Odawara, JP;
Akihiko Hirano, Odawara, JP;
Eisaku Saiki, Yokohama, JP;
Masakazu Hosino, Gunma-ken, JP;
Ryushi Shimokawa, Takasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer System Ltd., Tokyo, JP;
Abstract
A phase lock loop system includes: a phase detecting circuit which operates on the basis of a signal waveform; a current output circuit for generating a current value from a phase difference detected by the phase detecting circuit; a filter which is constructed by only a resistor in a phase locked state by a synchronizing signal and by a capacitor and the resistor upon phase following state; and a voltage controlled oscillator for controlling an oscillation frequency by a voltage output of the filter. The phase lock loop system operates as a primary phase lock loop circuit in the phase locked state by the synchronizing signal and operates as a secondary phase lock loop circuit upon phase following state.