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

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer

Reexamination Certificate

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Details

C327S147000, C327S156000, C331S00100A

Reexamination Certificate

active

11498958

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.

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patent: 6114914 (2000-09-01), Mar
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patent: 6456165 (2002-09-01), Kelkar
patent: 6556086 (2003-04-01), Keaveney et al.
patent: 6693987 (2004-02-01), Hattori
patent: 6943600 (2005-09-01), Craninckx
patent: 7116144 (2006-10-01), Cheng

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