Low jitter frequency synthesizer

Details Low jitter frequency synthesizer Low jitter frequency synthesizer

2007-09-25

2007-09-25

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S156000

Reexamination Certificate

active

11229472

ABSTRACT:
A frequency synthesizer IC is disclosed that includes a variable delay circuit, a fractional-N phase locked loop circuit, and a feedback loop. The variable delay circuit is electrically coupled to the input of the fractional-N phase locked loop circuit. The feedback loop couples a first control signal from the fractional-N phase locked loop to the variable delay circuit. The variable delay circuit generates a reference signal that has a phase delay that varies in accordance with a second control signal and a first control signal. The fractional-N phase locked loop circuit is operable upon receiving the reference signal to generate the first control signal, the second control signal, and an output signal having a frequency that is a non-integer product of the reference signal.

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patent: 6788232 (2004-09-01), Lee
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patent: 6873213 (2005-03-01), Tsuda et al.

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