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:
Aug. 21, 2001
Filed:
Mar. 23, 2000
Darrell Livezey, Auburn, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A technique controls a charge pump bias circuit in a phase-locked loop (PLL) circuit. The charge pump bias circuit biases a charge pump circuit. A digital phase detector generates direction control signals based on reference and pre-scale count signals from reference and pre-scale counting circuits, respectively. The direction control signals control direction of current pumped by the charge pump circuit. A charge pump enable generator generates an enable signal based on look-ahead reference and pre-scale count signals from the reference and pre-scale counting circuits, respectively. The look-ahead reference and pre-scale count signals are generated before the corresponding reference and pre-scale count signals by a predetermined time interval. The enable signal powers down the charge pump bias circuit after the charge pump circuit pumps the current.