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. 04, 2005
Filed:
May. 13, 2003
Applicants:
Sang Jin Byun, Daejeon, KR;
Beomsup Kim, Cupertino, CA (US);
Chan-hong Park, Seoul, KR;
Inventors:
Assignee:
Berkana Wireless, Inc., Campbell, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L007/06 ;
U.S. Cl.
CPC ...
Abstract
A technique is disclosed for providing a charge pump circuit for phase locked loop (PLL) to reduce mismatch of up/down currents and feed-through of up/down currents to voltage output. Elimination of feed-through of the input signal may be achieved by using differential switches (Mand M, and Mand M) based on DC reference voltage in the charge pump and also eliminate the mismatch of up/down currents in a wide voltage output range by applying a new replica biasing using feedback.