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:
Oct. 17, 2000
Filed:
Apr. 23, 1997
Applicant:
Inventor:
Shoichi Tanaka, Shizuoka, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B / ; H03L / ;
U.S. Cl.
CPC ...
331158 ; 3311 / ; 331175 ; 331160 ; 331183 ;
Abstract
A crystal oscillation circuit includes a main oscillation circuit, an auxiliary oscillation circuit, and a control circuit. The main oscillation circuit has a crystal resonator. The auxiliary oscillation circuit increases an exciting current of the crystal resonator to assist the start of oscillation of the main oscillation circuit. The control circuit connects the auxiliary oscillation circuit parallel to the main oscillation circuit at the start of oscillation to increase an exciting current of the crystal resonator.