Delay-locked loop (DLL) system for determining forward clock...

Details Delay-locked loop (DLL) system for determining forward clock... Delay-locked loop (DLL) system for determining forward clock...

2009-02-05

2009-11-17

Zweizig, Jeffrey S (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

07619453

ABSTRACT:
A delayed locked loop (DLL) system and method for determining a forward clock path delay are disclosed. One embodiment of the DLL system includes a delay line having a plurality of delay stages. The DLL system also includes a measure shot device configured to determine a forward clock path delay of the DLL system. The measure shot device is configured to provide a calibration sequence into the DLL loop and to detect the calibration sequence after the calibration sequence has passed through the DLL loop. The measure shot device is further configured to count the number of clocks for a period of time between providing and detecting the calibration sequence. The number of clocks can be used to calibrate components of the DLL system.

REFERENCES:
patent: 7212053 (2007-05-01), Gomm et al.
patent: 7332950 (2008-02-01), Blodgett
patent: 7368965 (2008-05-01), Drexler et al.
patent: 7375565 (2008-05-01), Kwak
patent: 7492200 (2009-02-01), Na

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