Optical drive for controlling output power of a pick-up head using apc loop
OwnerHsueh-Kun Liao, Hseang-Ji Hsiehinventors
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Abstract
An optical drive includes a comparator for comparing a first input signal with a second input signal to generate a first output signal at a first node; a signal source coupled to a second node, the signal source outputting a second output signal; and a switch for outputting a third output signal at a third node, the third output signal controlling a laser power of the optical drive, wherein when the switch is switched to the first node, the first output signal is transmitted to the third node and serves as the third output signal, and when the switch is switched to the second node, the second output signal is transmitted to the third node and serves as the third output signal.
Claims8
An optical drive, comprising:
- a comparator for comparing a first input signal with a second input signal to generate a first output signal at a first node;
- a signal source coupled to a second node, the signal source outputting a second output signal;
- and
- a switch for outputting a third output signal at a third node, the third output signal controlling a laser power of the optical drive, wherein when the switch is switched to the first node, the first output signal is transmitted to the third node and serves as the third output signal, and when the switch is switched to the second node, the second output signal is transmitted to the third node and serves as the third output signal.
A circuit, comprising:
- a comparator for comparing a first input signal with a second input signal to generate a first output signal at a first node;
- a first signal source coupled to a second node, for outputting a second output signal;
- a first switch coupled to a third node, wherein when the first switch is switched to the first node, the first output signal is transmitted to the third node, and when the first switch is switched to the second node, the second output signal is transmitted to the third node;
- and
- a switch controller for controlling the switching operation of the first switch in response to the first output signal and the second output signal.
A circuit, comprising:
- a comparator comprising a first input and a second input;
- a power supply for outputting a first reference signal at a first node and a second reference signal at a second node;
- a first signal source for outputting a first output signal to the second input of the comparator, wherein a value of the first reference signal is greater than that of the first output signal, and a value of the second reference signal is less than that of the first output signal;
- and
- a first switch coupled to a third node, the third node being coupled to the first input of the comparator, wherein when the first switch is switched to the first node, the first node is connected to the third node, and when the first switch is switched to the second node, the second node is connected to the third node.
Dependencies are inferred from the claim text.