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. 01, 2003
Filed:
Sep. 05, 2001
Sung-gi Yang, Yongin, KR;
Samsung Electronics Co., Ltd., Seoul, KR;
Abstract
A charge pump circuit capable of improving the matching and switching characteristics, charge current, and discharge current and reducing leakage current and a phase locked loop including the charge pump circuit. In one aspect, the charge pump circuit comprise a first current source for sourcing current to an output terminal of the charge pump circuit in response to first bias voltage, a first switching device which is switched in response to a first control signal and a pull-down device for pulling down the voltage of a connection node of the first switching device between the first current source in response to the first control signal. In another aspect, the charge pump circuit comprises a second current source for sinking current from the output terminal of the charge pump circuit in response to second bias voltage, a second switching device which is switched in response to a second control signal and a pull-up device for pulling up the voltage of a connection node between the second switching device and the second current source in response to the second control signal.