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公开(公告)号：US5999549A
公开(公告)日：1999-12-07
申请号：US20553
申请日：1998-02-09
CPC分类号： H01S5/06825 , H01S3/0014
摘要： A method and apparatus are provided for laser safety. A fault detector detects laser fault conditions and generates a laser fault control signal. A laser fault counter is coupled to the fault detector for counting laser fault conditions and for generating a disable laser control signal responsive to a predetermined fault count. A reset timer is coupled to the laser fault counter for identifying a predetermined reset time period responsive to the laser fault control signal and applying a reset signal to the laser fault counter. Features of laser safety method and apparatus of the invention are that the laser fault counter is reset if a second laser fault condition is not detected within the predetermined reset time period after the laser is turned on. The disable laser control signal is not generated when a safe laser optical power condition occurs between two laser fault conditions.
摘要翻译： 提供了用于激光安全的方法和装置。 故障检测器检测激光故障状况并产生激光故障控制信号。 激光故障计数器耦合到故障检测器，用于对激光器故障状况进行计数，并且响应于预定的故障计数产生禁用的激光控制信号。 复位定时器耦合到激光故障计数器，用于响应于激光故障控制信号识别预定的复位时间周期，并将复位信号施加到激光故障计数器。 本发明的激光安全方法和装置的特征在于，在激光打开之后的预定复位时间段内没有检测到第二激光故障条件时，激光故障计数器被复位。 在两个激光故障条件之间发生安全的激光光功率条件时，不产生禁用激光控制信号。
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2.发明授权High bandwidth mean absolute value signal detector with hysteresis and tunability 有权具有滞后和可调性的高带宽平均绝对值信号检测器公开(公告)号：US06177815B1
公开(公告)日：2001-01-23
申请号：US09396989
申请日：1999-09-15
IPC分类号： H03K522
CPC分类号： H03K5/153 , G01R19/155 , G01R19/1659
摘要： A improved signal detector is provided. The signal detector includes a linear amplifier receiving the input signal and providing an amplified signal. A full-wave rectifier is coupled to the linear amplifier and provides a rectified signal. A low-pass filter is coupled to the full-wave rectifier receiving the rectified signal and providing a comparing signal. A high threshold reference and a low threshold reference respectively is applied to a first comparator and a second comparator, each receiving the comparing signal. The first comparator and the second comparator respectively provide a first compared signal and a second compared signal. A reference path providing the high threshold reference and the low threshold reference includes a linear amplifier, a full-wave rectifier and a low-pass filter providing the high threshold reference. A linear charge pump is connected at its input to the linear amplifier and connected at its output to a low-pass filter to provide the low threshold reference.
摘要翻译： 提供改进的信号检测器。 信号检测器包括接收输入信号并提供放大信号的线性放大器。 全波整流器耦合到线性放大器并提供整流信号。 低通滤波器耦合到接收整流信号的全波整流器并提供比较信号。 分别将高阈值参考值和低阈值参考值应用于每个接收比较信号的第一比较器和第二比较器。 第一比较器和第二比较器分别提供第一比较信号和第二比较信号。 提供高阈值参考和低阈值参考的参考路径包括线性放大器，全波整流器和提供高阈值参考的低通滤波器。 线性电荷泵在其输入端连接到线性放大器，并在其输出端连接到低通滤波器以提供低阈值参考。
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公开(公告)号：US06392215B1
公开(公告)日：2002-05-21
申请号：US09399498
申请日：1999-09-20
IPC分类号： G01J132
CPC分类号： H01S5/042 , H01S5/0683
摘要： An improved laser diode driving circuit is disclosed which includes a current source, an operational amplifier, a light sensing device, a current mirror, and a constant current source. The current source is coupled to the laser diode for biasing the laser diode. The operational amplifier has an output coupled to the current source for driving the current source. The operational amplifier includes a first and a second input. The first input is coupled to a reference voltage. The second input receives a feedback signal. The light sensing device is coupled to a first supply voltage for detecting a portion of an optical power output from the laser. The light sensing device generates a monitor current proportional to the detected optical power output. The current mirror is coupled to the light sensing device and the second input of the operational amplifier. The current mirror receives the monitor current and generates a mirror current which is substantially equal to the monitor current. The constant current source is coupled to the second input of the operational amplifier for outputting a reference current. The reference current and the mirror current are then utilized to generate the feedback signal.
摘要翻译： 公开了一种改进的激光二极管驱动电路，其包括电流源，运算放大器，光感测装置，电流镜和恒流源。 电流源耦合到激光二极管以偏置激光二极管。 运算放大器具有耦合到电流源的输出，用于驱动电流源。 运算放大器包括第一和第二输入。 第一输入耦合到参考电压。 第二输入接收反馈信号。 光感测装置耦合到用于检测从激光器输出的光功率的一部分的第一电源电压。 光感测装置产生与检测到的光功率输出成正比的监视电流。 电流镜耦合到光感测装置和运算放大器的第二输入端。 电流镜接收监视电流并产生基本上等于监视电流的反射镜电流。 恒流源耦合到运算放大器的第二输入端，用于输出参考电流。 然后利用参考电流和反射镜电流来产生反馈信号。
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4.发明授权Method and apparatus for providing hot plugging protection for laser optoelectronic devices 失效为激光光电器件提供热封保护的方法和设备
公开(公告)号：US6091750A
公开(公告)日：2000-07-18
申请号：US47829
申请日：1998-03-25
CPC分类号： H01S5/06825
摘要： A method and apparatus for providing hot plugging protection for a laser optoelectronic device in a laser driver and fault detection circuit are provided. The power supply voltage is compared with a defined threshold potential utilizing a power on reset (POR) circuit. Responsive to detecting a power supply voltage potential below the defined threshold potential, an output control signal is generated. A current interrupt laser driver control signal is generated responsive to the output control signal to interrupt the laser driver current. A clear fault control signal is simultaneously generated responsive to the output control signal.
摘要翻译： 提供了一种用于在激光驱动器和故障检测电路中为激光光电子器件提供热插拔保护的方法和装置。 使用上电复位（POR）电路将电源电压与定义的阈值电位进行比较。 响应于检测低于定义的阈值电位的电源电压电位，产生输出控制信号。 产生响应于输出控制信号的中断激光驱动器控制信号以中断激光驱动器电流。 响应于输出控制信号同时产生清除的故障控制信号。
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5.发明授权Delay interpolating voltage-controlled oscillator with linear transfer function 失效延迟内插具有线性传递函数的压控振荡器
公开(公告)号：US5789989A
公开(公告)日：1998-08-04
申请号：US787666
申请日：1997-01-23
IPC分类号： H03K3/0231 , H03K3/354 , H03B27/00 , H03B1/00
CPC分类号： H03K3/354 , H03K3/0231
摘要： A delay interpolating voltage controlled oscillator (VCO) is provided. The delay interpolating VCO includes an input for receiving differential control input. A non-linear current steering circuit is coupled to the input for generating a non-linear delay responsive to the differential control input. A frequency signal is provided at a VCO output responsive to the differential control input and the non-linear delay with the frequency signal being linearly related to the differential control input.
摘要翻译： 提供了一种延迟内插压控振荡器（VCO）。 延迟内插VCO包括用于接收差分控制输入的输入。 非线性电流导引电路耦合到输入端，用于响应差分控制输入产生非线性延迟。 响应于差分控制输入和频率信号与差分控制输入线性相关的非线性延迟，在VCO输出处提供频率信号。
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