Phase-locked-loop circuit having a pre-calibration function...

Details Phase-locked-loop circuit having a pre-calibration function... Phase-locked-loop circuit having a pre-calibration function...

2011-01-25

2011-01-25

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S148000

Reexamination Certificate

active

07876136

ABSTRACT:
A phase-locked loop (PLL) integrated circuit includes an oscillation control voltage generating circuit therein. The oscillation control voltage generating circuit is configured to pre-scale an output current of a charge pump therein to a first level in response to disposing the PLL integrated circuit into a pre-calibration mode of operation. The oscillation control voltage generating circuit may be responsive to an input signal (e.g., SIN) and a feedback signal (e.g., SFEED), and the magnitude of the first level of the charge pump current during the pre-calibration mode of operation may be independent of any phase difference between the input signal and the feedback signal.

REFERENCES:
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patent: 7274764 (2007-09-01), Loke et al.
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patent: 7508244 (2009-03-01), Hallivuori
patent: 7519140 (2009-04-01), Yoshimura
patent: 2003/0085743 (2003-05-01), Ullmann et al.
patent: 2003-078410 (2003-03-01), None
patent: 2005-260866 (2005-09-01), None
patent: 1020000008299 (2000-02-01), None

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