Slew rate limiting circuit and optical disc apparatus

Details Slew rate limiting circuit and optical disc apparatus Slew rate limiting circuit and optical disc apparatus

2007-04-10

2007-04-10

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Control of information signal processing channel

C369S047260

Reexamination Certificate

active

10513514

ABSTRACT:
In a slew rate limiter, a slew rate is limited so as not to pass a signal varying more abruptly than a wobble signal included in a difference signal generated by a differential amplifier, and this limited slew rate is used to process the difference signal to be outputted. That is, the slew rate limiter removes a signal varying more abruptly than a wobble signal included in a difference signal DIFO, and then outputs only the wobble signal. A DAC generates an offset voltage. An adder is used to add this offset voltage to the wobble signal from the slew rate limiter. The signal obtained by this addition as a slice level is compared by a comparator with the difference signal, thereby reproducing an LPP signal.

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Tsunekawa, Masao, Servo control circuit for disk drive, JP 03-160673 A.

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