Phase-locked loop bandwidth calibration
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United States of America Patent
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Mar 10, 2009
Grant Date -
Dec 6, 2007
app pub date -
May 31, 2006
filing date -
May 31, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A novel circuit for obtaining the bandwidth of a phase-locked loop circuit is disclosed. The circuit adjusts a phase of a signal (reference or generated), causing the phase-locked loop circuit to adjust the frequency of its voltage-controlled oscillator as it recovers a phase lock. The circuit times the duration of the recovery stage, from which the loop bandwidth may be obtained. Adjustments to the programmable portions of the phase-locked loop may then be made in accordance with design specifications.
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