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:
Nov. 28, 2000
Filed:
Apr. 14, 1999
Applicant:
Inventor:
Kenji Yoshioka, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 18 ; 331 / ; 331-8 ; 331 25 ; 331182 ; 327156 ; 327157 ; 327159 ;
Abstract
A phase locked loop (PLL) oscillating circuit includes a first oscillating circuit, a lock detector and a reference oscillating circuit. The first oscillating circuit generates an oscillation signal with a first frequency, and controls the first frequency based on a reference signal. The lock detector detects phase lock between the oscillation signal and the reference signal to a lock detection signal. The reference oscillating circuit includes a crystal oscillation element, and generates the reference signal. An oscillation state of the reference oscillating circuit is controlled based on the lock detection signal.