Laser driver/method for generating a laser drive signal
    1.
    发明授权
    Laser driver/method for generating a laser drive signal 失效
    用于产生激光驱动信号的激光驱动器/方法

    公开(公告)号:US07362690B2

    公开(公告)日:2008-04-22

    申请号:US10560678

    申请日:2004-06-16

    IPC分类号: G11B7/00

    摘要: A driver for driving a light generator for generating light, comprising a digitalto-analog converter (DAC) having a data input, a data output for generating an analog signal, a first multiplexer (MUX1) for cyclic selection of a number of data levels corresponding to desired intensity levels of the light and for coupling the data levels to the data input; a de multiplexer (DE-MUX) synchronized with the first multiplexer (MUX1) for de-multiplexing the analog signal into a set of analog signals; memory means for temporarily storing the set of analog signals; and a second multiplexer (MUX2) for selection of the stored set of analog signals and for generating a drive signal (IL) for the light generator. The memory means is preferably implemented by a set of capacitors (C1-C8). Usually, for instance in an optical disc drive, the light generator is implemented by a laser (Ls). In this situation the data input of the digital-to-analog converter comprises a threshold data input part; a delta data input part; a threshold gain reference input associated with the threshold data input part; and a delta gain reference input associated with the delta data input part. So in fact the DAC is split into two parts (DAC1 and DAC2) for separate threshold power and delta power control of the laser (LS).

    摘要翻译: 一种用于驱动用于产生光的光发生器的驱动器,包括具有数据输入的数模转换器(DAC),用于产生模拟信号的数据输出端,用于循环选择多个数据电平的第一多路复用器(MUX1) 对应于光的期望强度水平并且用于将数据电平耦合到数据输入; 与多路复用器(DE-MUX)同步的第一多路复用器(MUX1),用于将模拟信号解复用为一组模拟信号; 用于临时存储该组模拟信号的存储装置; 和用于选择存储的模拟信号组并用于产生用于光发生器的驱动信号(IL)的第二多路复用器(MUX2)。 存储装置优选地由一组电容器(C 1 -C 8)实现。 通常,例如在光盘驱动器中,光发生器通过激光(L s)实现。 在这种情况下,数模转换器的数据输入包括阈值数据输入部分; 增量数据输入部分; 与阈值数据输入部分相关联的阈值增益参考输入; 以及与增量数据输入部分相关联的增量增益参考输入。 因此,事实上,DAC分为两部分(DAC 1和DAC 2),用于激光器(LS)的单独阈值功率和Δ功率控制。