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:
Apr. 10, 2001
Filed:
Jun. 07, 1999
Applicant:
Inventors:
Shen Feng, San Diego, CA (US);
Edmund Götz, Dachau, DE;
Assignee:
Siemens Aktiengesellscaft, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/089 ;
U.S. Cl.
CPC ...
H03L 7/089 ;
Abstract
In a PLL circuit, the precharging function necessary for setting a required initial state of a VCO is achieved by an additional precharge pump inserted in parallel with the charge pump, or alternatively by multiplexers and inverters implemented directly with the charge pump. The precharging function being controlled in both cases by two control signals. PLL circuits according to the invention are applied, in particular, in integrated circuits of mobile transceivers, for example for GSM, PCN and PCS.