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1.发明授权Apparatus for generating pulse-like constant current having variable pulse width 失效用于产生具有可变脉冲宽度的脉冲状恒定电流的装置
公开(公告)号：US5008562A
公开(公告)日：1991-04-16
申请号：US388200
申请日：1989-08-01
摘要： An apparatus for generating a pulse-like constant current with a variable pulse width for use in evaluating thermal characteristics of a laser diode. The apparatus comprises a first constant current (or voltage) circuit constituted by a high-speed amplifer, a second constant (or voltage) circuit constituted by a low-speed amplifier and connected in parallel with the first constant current circuit, a bias circuit for increasing higher the output voltage of the second constant current circuit than that of the first constant current circuit, a switching circuit for turning on and off the first and second constant current circuits in response to first and second timing signals, respectively, in such a manner that the first timing signal and the second timing signal are simultaneously turned on while the second timing signal is turned off only after the first timing signal has been turned off, and a regulator for changing the width of the output current pulse by varying the on/off durations of the first and second timing signals. For evaluating the thermal characteristics of the laser diode, the pulse-like constant current is applied for excitation and the pulse width of the current is varied to change the light emission characteristics of the diodes, which are measured and compared for making evaluation.
摘要翻译： 一种用于产生具有可变脉冲宽度的脉冲状恒定电流用于评估激光二极管的热特性的装置。 该装置包括由高速放大器，由低速放大器构成并与第一恒流电路并联连接的第二常数（或电压）电路构成的第一恒定电流（或电压）电路，用于 使第二恒定电流电路的输出电压比第一恒定电流电路的输出电压高，用于分别响应第一和第二定时信号接通和断开第一和第二恒定电流电路的开关电路， 第一定时信号和第二定时信号同时导通，而第二定时信号仅在第一定时信号已经断开之后被关断;以及调节器，用于通过改变输入电流脉冲的开/关来改变输出电流脉冲的宽度， 关闭第一和第二定时信号的持续时间。 为了评估激光二极管的热特性，施加脉冲状恒定电流用于激发，并且改变电流的脉冲宽度以改变测量和比较的二极管的发光特性以进行评估。
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公开(公告)号：US4697138A
公开(公告)日：1987-09-29
申请号：US875817
申请日：1986-06-18
CPC分类号： G01R31/3177 , G01R13/34 , G06F11/25
摘要： A logic analyzer includes a plurality of data sampling channels which are operative in response to respective different clock signals independent of one another. Information of the sequence in time in which the sampled data are produced in the plurality of the sampling channels is stored in a memory for the purpose of display. To this end, each of the sampling channels is provided with a clock discriminating circuit having two inputs supplied with a common clock signal generated internally and a clock signal specific to the associated sampling channel. The outputs of all the clock discriminating circuits are stored in a memory whose contents thus indicate the sequence in time in which the data are sampled in the plurality of the sampling channels.
摘要翻译： 逻辑分析器包括多个数据采样通道，其响应于彼此独立的各个不同的时钟信号而工作。 在多个采样通道中产生采样数据的时间序列的信息被存储在用于显示的目的的存储器中。 为此，每个采样通道设置有具有两个输入的时钟识别电路，该两个输入端被提供有内部产生的公共时钟信号以及特定于相关采样通道的时钟信号。 所有时钟识别电路的输出被存储在存储器中，其内容因此表示在多个采样通道中数据被采样的时间的顺序。
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公开(公告)号：US4713813A
公开(公告)日：1987-12-15
申请号：US878101
申请日：1986-06-25
CPC分类号： G01R31/3177 , G06F11/25
摘要： A logic analyzer including at least a sampling system for sampling input data with a sampling clock signal comprises a condition decision circuit having inputs supplied with the input data and an internal clock signal for producing a conditioning signal in dependence on the input data in synchronism with the internal clock signal, a clock detection circuit for deciding whether the sampling clock signal makes appearance within a predetermined period of the internal clock signal to produce a signal representative of the result of the decision, and a control circuit having inputs supplied with the conditioning signal and the signal representative of said result for producing a trigger signal corresponding to the conditioning signal in dependence on the signal representative of the result of decision.
摘要翻译： 至少包括用于采样时钟信号对输入数据进行采样的采样系统的逻辑分析器包括条件判定电路，其具有输入的输入数据和内部时钟信号，用于根据输入数据同步产生调节信号 内部时钟信号，时钟检测电路，用于判定采样时钟信号是否在内部时钟信号的预定周期内出现，以产生表示该决定结果的信号;以及控制电路，其具有被提供有调节信号和 所述信号表示所述结果，用于根据表示决定结果的信号产生对应于调节信号的触发信号。
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