Patent 7138844 was granted and assigned to Altera on November, 2006 by the United States Patent and Trademark Office.
Circuitry for providing an input data signal to other circuitry on an integrated circuit includes a course delay chain and a fine delay chain. These two delay chains are cascadable, if desired, to provide a very wide range of possible amounts of delay which can be finely graded by use of the fine delay chain.