Continuous, wide-range frequency synthesis and phase...

Details Continuous, wide-range frequency synthesis and phase... Continuous, wide-range frequency synthesis and phase...

2007-07-10

2007-07-10

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

C327S147000, C327S156000, C331S00100A

Reexamination Certificate

active

10990216

ABSTRACT:
Circuitry and methods are provided for continuously adjustable frequency synthesis. The synthesis covers a wide range of possible frequencies and can be performed to a high degree of precision. In an embodiment of the invention, an analog phase-locked loop (“PLL”) performs relatively coarse wide-range frequency synthesis, while a digital PLL performs relatively fine narrow-range frequency synthesis and phase alignment. The analog PLL is capable of varying frequency in a stepwise linear fashion. The digital PLL communicates with the analog PLL to ensure that the output of the analog PLL is within the digital PLL's specified pull-in range.

REFERENCES:
patent: 6114914 (2000-09-01), Mar
patent: 6456165 (2002-09-01), Kelkar
patent: 6556086 (2003-04-01), Keaveney et al.
patent: 6943600 (2005-09-01), Craninckx
U.S. Appl. No. 10/802,597, filed Mar. 14, 2004, Cheng.

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