Power control circuit for optical information recording device
AssigneeTian Holdings, LLC
InventorYing-Lang Chuang
Life of this patent
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Abstract
A power control circuit for an optical information recording device is disclosed. A power sampling signal from a photodiode is transmitted to a peal envelope acquiring circuit and a bottom envelope acquiring circuit and then sampled and held, which is fed-back to a laser diode driving circuit. The laser diode driving circuit alters a driving signal emitted to the laser diode according to the fed-back signal to adjust the power of the optical signal emitted from the laser diode. Therefore, cost is reduced and the power control circuit is particularly suitable for high-speed recordable optical disk drive.
Claims30
A method for controlling a bias power of an optical disk device, comprising:
- generating a bottom envelope signal from a power sampling signal sensed by a photodiode of the optical disk device;
- sampling the bottom envelope signal;
- and
- controlling a bias power of the optical disk device responsive to the sampled bottom envelope signal,
- wherein a frequency of the bottom envelope signal is lower than that of the power sampling signal.
A method for controlling a write power of an optical disk device, comprising:
- generating a peak envelope signal from a power sampling signal sensed by a photodriode of the optical disk device;
- sampling the peak envelope signal;
- and
- controlling a write power of the optical disk device responsive to the sampled peak envelope signal,
- wherein a frequency of the peak envelope signal is lower than that of the power sampling signal.
A bias power control circuit of an optical disk drive comprising:
- a bottom envelope acquiring circuit for outputting a bottom envelope signal responsive to a power sampling signal sensed by a photodiode of the optical disk device;
- and
- a bias-period sample-and-hold circuit for sampling and outputting the bottom envelope signal wherein the bias power is controlled according to the sampled bottom envelope signal, and
- wherein a frequency of the bottom envelope signal is lower than that of the power sampling signal.
A write power control circuit for an optical disk drive comprising:
- a peak envelope acquiring circuit for outputting a peak envelope signal in responsive to a power sampling signal by a photodiode of the optical disk device;
- and
- a write-period sample-and-hold circuit for sampling and outputting the peak envelope signal wherein the write power is controlled according to the sampled peak envelope signal, and wherein a frequency of the peak envelope signal is lower than that of the power sampling signal.
A method for controlling a power of an optical disk device for writing data to an optical disk, the method comprising:
- generating a power sampling signal according to the power of the optical disk device for writing data to the optical disk;
- and
- controlling the power of the optical disk device based on an envelope of the power sampling signal, wherein the frequency of the envelope of the power sampling signal is lower than the frequency of the power sampling signal.
A method for controlling a write power of an optical disk device, the method comprising:
- generating a power sampling signal by sensing the power generated by the optical disk device;
- and
- controlling the write power of the optical disk device based on an average level of the power sampling signal within a plurality of write periods, wherein the frequency of the average level of the power sampling signal is lower than the frequency of the power sampling signal.
A method for controlling a bias power of an optical disk device, the method comprising:
- generating a power sampling signal by sensing the power generated by the optical disk device;
- and
- controlling the bias power of the optical disk device based on an average level of the power sampling signal within a plurality of bias periods, wherein the frequency of the average level of the power sampling signal is lower than the frequency of the power sampling signal.
A power control circuit for controlling a power of an optical disk device for writing data to an optical disk, the power control circuit comprising:
- an element for generating a power sampling signal according to the power of the optical disk device for writing data to the optical disk;
- and
- a controlling circuit for controlling the power of the optical disk device based on an envelope of the power sampling signal, wherein the frequency of the envelope of the power sampling signal is lower than the frequency of the power sampling signal.
A power control circuit for controlling a write power of an optical disk device, the power control circuit comprising:
- an element for sensing the power generated by the optical disk device to generate a power sampling signal;
- and
- a controlling circuit for controlling the write power of the optical disk device based on an average level of the power sampling signal within a plurality of write periods, wherein the frequency of the average level of the power sampling signal is lower than the frequency of the power sampling signal.
A power control circuit for controlling a bias power of an optical disk device, the power control circuit comprising:
- an element for sensing the power generated by the optical disk device to generate a power sampling signal;
- and
- a controlling circuit for controlling the bias power of the optical disk device based on an average level of the power sampling signal within a plurality of bias periods, wherein the frequency of the average level of the power sampling signal is lower than the frequency of the power sampling signal.
Dependencies are inferred from the claim text.