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:
May. 16, 2006
Filed:
Aug. 27, 2003
Declan Mcdonagh, Duluth, GA (US);
Paul Murtagh, Duluth, GA (US);
Declan McDonagh, Duluth, GA (US);
Paul Murtagh, Duluth, GA (US);
Intergrated Device Technology, Inc., San Jose, CA (US);
Abstract
A phase locked loop (PLL) circuit includes a controlled oscillator circuit that is operative to generate an output clock signal responsive to an oscillator control signal according to a plurality of selectable transfer functions, and an oscillator control signal generator circuit that is operative to generate the oscillator control signal responsive to the output clock signal and a reference clock signal. The PLL circuit further includes a transfer function control circuit operative to transition operation of the controlled oscillator from a first one of the transfer functions to a second one of the transfer functions responsive to the oscillator control signal. For example, the transfer function control circuit may step the controlled oscillator circuit through a succession of the transfer functions in response to a change in a frequency of the reference clock signal and may enable a closed loop including the oscillator control signal generator circuit and the controlled oscillator circuit upon selection of each of the succession of transfer functions.