Power control circuit of optical information recording device

Abstract

The power sampled signal, which is the output of the sensitization diode, is input to the peak envelope acquiring circuit and the bottom envelope acquiring circuit int he power control circuit. With the sample hold operation being carried out, the signal is fed to the laser diode drive circuit. Based on the signal fed, the laser diode drive circuit changes the drive current output to the laser diode, in order to adjust the power of the light signal emitted by the laser diode. The invention is particularly suitable to the high-speed recordable optical disc drive, since it's low cost.

Description

technical field [0001] The invention relates to a power control circuit of an optical information recording device, and in particular to a power control circuit suitable for a high-speed optical information recording device. Background technique [0002] As the demand for high-capacity backup increases, the use of optical information recording devices, such as recordable optical disc drives, is becoming more and more popular. When a rewritable optical disc (CD-RW) is burned by a rewritable optical disc (CD-RW), a laser diode (laser diode) emits light to generate energy required for burning. During the entire burning process, the laser diode must be able to provide three kinds of optical signals with different powers. When optical signals of different powers irradiate the optical disc, the data areas on the optical disc will correspondingly produce different states due to the optical signals of different powers. [0003] Please refer to figure 1 , figure 1 It shows the po...

AI Technical Summary

Problems solved by technology

When the frequency of the power sampling signal PI increases, the writing cycle and the bias cycle shorten (that is, the sampling time T S2 shortened, T S2 S1 ), the power control circuit of the traditional recordable optical disk drive will not be able to sample the correct signal level due to the speed of the write cycle sample hold circuit 206 and the bias voltage cycle sample hold circuit 208, and cannot perform correctly Optical Signal Compensation Operation

If you switch to a faster sample-and-hold circuit, the cost is too high

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