Write signal generator with delay calibration

Abstract

An aligned write signal generator with alignment calibration utilizes an alignment unit to align a plurality of write signal. The aligned write signal generator includes a write signal generator for receiving an EFM signal and converting the EFM signal into a plurality of write signals according to a write strategy waveform generating rule, an alignment unit for receiving the plurality of write signals, aligning the write signals and outputting phase adjusted write signals, and a phase calibration unit for receiving the phase adjusted write signals, detecting phase error between the phase adjusted write signals, and outputting phase control signals. The alignment unit further receives the phase control signals to adjust the delay time of each write signal.

Description

[0001]This application claims the benefit of the filing date of Taiwan Application Ser. No. 092116882, filed Jun. 20, 2003, the content of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a write signal generator in an optical disk drive, and more particularly to an aligned write signal generator with delay calibration in an optical disk drive utilizing an alignment unit to align the write signals with each other in time.[0004]2. Description of the Related Art[0005]FIG. 1 illustrates a block diagram of a laser power control system in a conventional optical disk drive. Referring to FIG. 1, the laser power control system 10 includes an EFM (Eight-to-Fourteen Modulation) encoder 11, a write signal generator 12, a LD driver (Laser diode driver) 13, and a LD (Laser Diode) 14. The EFM encoder 11 receives the input data and generates the EFM signal according to the EFM encoding rule. The write signal generato...

AI Technical Summary

Benefits of technology

The solution effectively aligns write signals, preventing waveform deformation and ensuring accurate data recording and reproduction by calibrating phase delays, thus enhancing the reliability of optical disk drives at higher write speeds.

Problems solved by technology

Correspondingly, the problems of the waveform deformation caused by the digital logic gate, buffer, and output driver within the write signal generator also become more serious owing to, for example, the different delay time among the write signals. FIG. 2 shows the ideal waveforms of three write signals and the corresponding drive signal, wherein FIG. 2A shows three write signals generated by an ideal write signal generator, and FIG. 2B shows the drive signal generated by the LD driver.

If the optical disk drive outputs such a deformed drive signal to the LD 14, the data may not be recorded in the optical disk in a proper format, thereby causing data error when one tries to reproduce the data in the optical disk.

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