Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2008-04-08
2008-04-08
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S159000
Reexamination Certificate
active
07355464
ABSTRACT:
A method and circuitry for a Delay Locked Loop (DLL) or a phase Locked Loop (PLL) is disclosed, which improves the loop stability at high frequencies and allows maximum tracking bandwidth, regardless of process, voltage, or temperature variations. Central to the technique is to effectively operate the loop at a lower frequency close to its own intrinsic bandwidth (1/tLoop) instead of at the higher frequency of the clock signal (1/tCK). To do so, in one embodiment, the loop delay, tLoop, is measured or estimated prior to operation of the loop. The phase detector is then enabled to operate close to the loop frequency, 1/tLoop. In short, the phase detector is made not to see activity during useless delay times, which prevents the loop from overreacting and becoming unstable.
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Jager Ryan C.
Micro)n Technology, Inc.
Wells Kenneth B.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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