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:
Sep. 05, 2006
Filed:
Nov. 30, 2004
Brian Jeffrey Galloway, Campbell, CA (US);
Brian Jeffrey Galloway, Campbell, CA (US);
Avago Technologies General IP (Singapore) Pte. Ltd., Singapore, SG;
Abstract
The 3 dB frequency bandwidth of a phase-locked loop (PLL) is determined by measuring the frequency of a voltage controlled oscillator (VCO) signal when an up charging current is applied, measuring the frequency of the VCO signal when a down charging current is applied, and then using the two frequency measurements to calculate the 3 dB frequency bandwidth of the PLL. The up and down charging currents can be applied through a charge current switch system and the frequency measurements can be made with a frequency counter, both of which are monolithically integrated with the PLL. The technique for measuring the 3 dB frequency bandwidth can be applied to a first order or a second PLL. When applied to a second order PLL, the technique includes an initial frequency centering operation.