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:
Jun. 08, 2004
Filed:
Feb. 15, 2002
Thomas P. Bushey, Apache Junction, AZ (US);
Jeremy W Moore, Chandler, AZ (US);
Morgan Fitzgibbon, WaterPark, IE;
Motorola, Inc., Schaumburg, IL (US);
Abstract
A charge pump arrangement for a phase-locked-loop has a current source circuit ( ) which provides charging current to the phase locked loop, and a current sink circuit ( ) which depletes charging current from the phase locked loop. The current source circuit ( ) and the current sink circuit ( ) have slew rates which have a predetermined relationship. In this way, the charge pump causes substantially no non-linear charge injection in the phase-locked-loop. Cascoded current mirrors ( ) are utilised to provide a high voltage with thin gate oxide technology. The arrangement has a relatively small die size. Since bias currents of the arrangement are mirrored according to the output current required, improved transient times are produced, leading to reduced phase noise.