Phase lock loop for optical disc drive and optical media with wobbled grooves
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United States of America Patent
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N/A
Issued Date -
May 20, 2004
app pub date -
Nov 7, 2003
filing date -
Nov 12, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A system and method for use in a data storage system which provides a combined phase lock loop (PLL) that utilizes a common Voltage Controlled Oscillator (VCO) and common integrator/loop-filter, but which is operational in a wobble-mode and a data-mode to provide most optimum operation and quick capture. Digital circuitry is primarily used in addition to the VCO and a loop-filter for acquiring frequency and phase lock while the optical disc drive is writing and reading. A digital Phase-detector for operation in the wobble-mode employs a down-counter that can be configured for both Frequency-Lock and Phase-Lock in a way that offers a large capture range and can adapt quickly to the multiple data-zones of the media-format.
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