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:
Jul. 03, 2001
Filed:
Mar. 26, 1999
Hirotaka Harada, Tokyo, JP;
Susumu Tanimoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A charge pump circuit for a PLL includes first and second constant current sources, first and second current mirror circuits, and first and second analog switch circuits. The first and second constant current sources generate constant currents. The first current mirror circuit supplies a constant current having a value corresponding to the constant current generated by the first constant current source to an output terminal. The first current mirror circuit has a first transistor connected to the first constant current source and a second transistor connected to the output terminal. The second current mirror circuit supplies a constant current having a value corresponding to the constant current generated by the second constant current source to the output terminal. The second current mirror circuit has a third transistor connected to the second constant current source and a fourth transistor connected to the output terminal. The first analog switch circuit is connected between the gates of the first and second transistors and turned on/off by a first control pulse. The second analog switch circuit is connected between the gates of the third and fourth transistors and turned on/off by a second control pulse.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile