Patent ID: 7263113
Filing Date: 2007-08-28
Classification: G11B,H01S

Abstract:
1. A laser power control circuit used for controlling the laser power of an optical pick-up unit (OPU), the laser power control circuit comprising: at least one sample/hold circuit electronically connected to the OPU for sampling and holding a front photodiode output signal to generate an analog feedback signal; at least one analog-to-digital converter (ADC) electrically coupled to the sample/hold circuit for transferring the analog feedback signal into a digital feedback signal; and at least one digital control circuit electrically coupled to the ADC for generating a power control signal and outputting the power control signal to the OPU in order to control the laser power of the OPU, the digital control circuit comprising: wherein the front photodiode output signal corresponds to the laser power of the OPU.