Delay-locked loop having a delay independent of input signal...

Details Delay-locked loop having a delay independent of input signal... Delay-locked loop having a delay independent of input signal...

2009-09-15

2011-12-13

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S149000

Reexamination Certificate

active

08076963

ABSTRACT:
A Delay-Locked Loop (DLL) uses a delay line to delay a first signal by a “delay time”, thereby generating a second signal. A capacitor is charged at a first rate starting at a first edge of first signal and continuing until an edge of the second signal. The capacitor is then discharged at a second rate until another edge of the first signal. A control loop controls the delay time such that the amount the capacitor is charged is the same as the amount the capacitor is discharged. The delay time is constant and is substantially independent of variations in the duty cycle of the first signal. In one example, duty cycle distortion cancellation is accomplished by changing the first rate proportionally with respect to changes in first signal duty cycle. In another example, the first and second rates are independent of the duty cycle of the first signal.

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