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:
Jul. 10, 2012
Filed:
May. 28, 2010
Mohammad S. Mobin, Orefield, PA (US);
Gregory W. Sheets, Breinigsville, PA (US);
Lane A. Smith, Easton, PA (US);
Paul H. Tracy, Schnecksville, PA (US);
Mohammad S. Mobin, Orefield, PA (US);
Gregory W. Sheets, Breinigsville, PA (US);
Lane A. Smith, Easton, PA (US);
Paul H. Tracy, Schnecksville, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
Methods and apparatus are provided for improved startup of a voltage controlled delay loop that has an injection clock and a return clock. A control signal is determined for a plurality of delay elements in a voltage controlled delay loop by obtaining a histogram count of a number of occurrences of at least one predefined logic value for a plurality of delay settings of the voltage controlled delay loop; determining a histogram count that approximately corresponds to an alignment of at least one edge in the injection and return clocks; and determining the control signal based on the determined histogram count that approximately corresponds to the alignment. The voltage controlled delay loop can be started using the determined control signal. The histogram count can be obtained for a plurality of PVT combinations and the control signal can then be determined for each PVT combination.