Method and apparatus for digital VCDL startup
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 10, 2012
Grant Date -
Sep 23, 2010
app pub date -
May 28, 2010
filing date -
Dec 31, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Other Claims data not available
