Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2011-04-19
2011-04-19
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S147000
Reexamination Certificate
active
07928779
ABSTRACT:
In a phase-locked loop, a desired change in frequency is indicated. The phase-locked loop locks to the new frequency and a loop bandwidth of the phase-locked loop is changed. In changing the loop bandwidth, a frequency adjustment signal to a voltage-controlled oscillator may include a voltage spike. The voltage spike is reduced by detecting a lock when the reference clock and a feedback clock reach a same frequency, then waiting for a time delay after the detecting the lock, and adjusting a current level of a charge pump pulse by an incremental amount to achieve a fractional portion of a new loop bandwidth. The charge pump pulse is filtered to generate the frequency adjustment signal and the frequency spike reduction process is repeated until the new loop bandwidth is achieved.
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Donovan Lincoln
Houston Adam D
Integrated Device Technology Inc.
TraskBritt P.C.
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