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. 22, 2008
Filed:
Jan. 26, 2006
Aysel Yildiz, Istanbul, TR;
Gregory Richmond, Sunnyvale, CA (US);
Arda Kamil Bafra, Istanbul, TR;
Cypress Semiconductor Corporation, Jose, CA (US);
Abstract
A method and circuit for performing switching in a frequency timing generator is described. The method includes detecting a request for a new value for a feedback counter or an reference counter, upon which a loading operation is synchronized for the appropriate counter. A time-out order of the feedback counter and the reference counter is determined. Where no time-out order difference is detected therein, a state machine status word function is completed. Where a time-out order difference is detected therein, it is determined which of the reference counter and the feedback counter times out first. Where the reference counter times out first, a constant charge pump current is delivered to a loop filter associated with a phase locked loop to achieve an upward frequency direction. Where the feedback counter times out first, a constant charge pump current is delivered to the loop filter to achieve a downward frequency direction.