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. 10, 2002
Filed:
Sep. 14, 2000
Steven J. Halter, San Diego, CA (US);
Qualcomm Incorporated, San Diego, CA (US);
Abstract
A counter for synthesizing clock signals with minimal jitter. The inventive counter has a first counter stage; a look-ahead circuit input connected to said first counter stage; and a selection circuit for choosing between an output of said first counter stage and an output of said look-ahead circuit as an output of said counter. In the specific embodiment, the first counter stage is adapted to receive a first clock signal having a frequency of N cycles per second and output a second clock signal having a frequency of M cycles per second. The first counter stage includes an accumulator having a rollover point at which an instantaneous count thereof exceeds the value of N−M. The look-ahead circuit determines for a present clock cycle the rollover point for a preceding clock cycle. The look-ahead circuit is a second counter stage adapted to ascertain whether the rising edge or the trailing edge of the second clock signal is closer to the rollover point and output an indication with respect thereto.