公开(公告)号：US06377036B1

公开(公告)日：2002-04-23

申请号：US09167307

申请日：1998-10-06

申请人： Nobuaki Takeuchi ,  Yoshiki Yanagisawa ,  Jun Kikuchi ,  Yoshio Endou ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Kazuyoshi Matsuhiro

发明人： Nobuaki Takeuchi ,  Yoshiki Yanagisawa ,  Jun Kikuchi ,  Yoshio Endou ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Kazuyoshi Matsuhiro

IPC分类号： G01R1324

CPC分类号： G01R13/0281

摘要： The present invention relates to an electro-optic sampling oscilloscope. The delay circuit in the electro-optic sampling oscilloscope comprises a delay time detecting circuit, a regulation time determining circuit, a counter circuit and a delay regulating circuit. The delay time detecting circuit detects in the trigger signal a value corresponding to the delay time of a reference clock from a reference clock generating circuit. The regulation time determining circuit determines a regulation time based on the value detected by the delay time detecting circuit so that the regulation time is an integer multiple of the reference clock. The counter circuit is triggered by the trigger signal to count the reference clock through a specific value. The delay regulating circuit employs a signal related to the regulation time from the regulation time determining circuit, to delay the signal output from the counter circuit by the regulation time.

摘要翻译： 本发明涉及电光采样示波器。 电光采样示波器中的延迟电路包括延迟时间检测电路，调节时间确定电路，计数器电路和延迟调节电路。 延迟时间检测电路在触发信号中检测与来自基准时钟发生电路的参考时钟的延迟时间对应的值。 调节时间确定电路基于由延迟时间检测电路检测的值来确定调节时间，使得调节时间是参考时钟的整数倍。 计数器电路由触发信号触发，通过特定值对参考时钟进行计数。 延迟调节电路采用与调节时间确定电路相关的调节时间的信号，延迟来自计数器电路的信号调节时间。

公开(公告)号：US06348787B1

公开(公告)日：2002-02-19

申请号：US09408753

申请日：1999-09-30

申请人： Akishige Ito ,  Katsushi Ohta ,  Toshiyuki Yagi ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Junzo Yamada

发明人： Akishige Ito ,  Katsushi Ohta ,  Toshiyuki Yagi ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Junzo Yamada

IPC分类号： G01R3100

CPC分类号： G01R15/241 ,  G01R1/071 ,  G01R13/347

摘要： A probe for an electrooptic sampling oscilloscope in which an electric field generated by a measured field is coupled with an electrooptic crystal. A beam is incident on this electrooptic crystal, and by the polarization state of the incident beam, the form of the measured signal is measured. The electrooptic element is supported form the end terminal side of the probe body by a probe head member that serves as the end terminal of the probe body. An insertion hole is formed from the outside up to the reflecting film on the probe head member. One end thereof is in contact with a reflecting film, the other end thereof is inserted so as to protrude from the probe head member, and at the same time, the external radial diameter of the insertion hole is formed so as to be large compared to the radial dimension of the reflected film.

摘要翻译： 用于电光采样示波器的探针，其中由测量场产生的电场与电光晶体耦合。 光束入射在该电光晶体上，并且通过入射光束的偏振状态，测量测量信号的形式。 电光元件通过用作探针主体的端部末端的探针头构件从探针主体的端部末端侧支撑。 从外部到探针头部件上的反射膜形成插入孔。 其一端与反射膜接触，其另一端插入以从探头头部件突出，同时形成插入孔的外径径相对于 反射膜的径向尺寸。

公开(公告)号：US06201235B1

公开(公告)日：2001-03-13

申请号：US09300287

申请日：1999-04-27

申请人： Nobuaki Takeuchi ,  Yoshiki Yanagisawa ,  Jun Kikuchi ,  Nobukazu Banjo ,  Yoshio Endou ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Junzo Yamada

发明人： Nobuaki Takeuchi ,  Yoshiki Yanagisawa ,  Jun Kikuchi ,  Nobukazu Banjo ,  Yoshio Endou ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Junzo Yamada

IPC分类号： G01J142

CPC分类号： G01R13/347

摘要： An electro-optic sampling oscilloscope facilitates adjustment of signal-to-noise ratio caused by electrical, optical and temperature factors. The instrument includes: a light generation section for generation a reference laser beam; a crystal, exhibiting an electro-optic response behavior so as to receive the reference laser beam and to result in changing a refractive index in accordance with electrical field strength generated by target signal; a reflection mirror formed on a rear surface of the crystal for reflecting the reference laser beam that has passed through the crystal; an optical circuit for separating the reference laser beam reflected from the reflection mirror into a first signal light and a second signal light; a first photo-electric conversion section for converting the first signal light into first electrical signals; a second photo-electric conversion section for converting the second signal light into second electrical signals; a differential amplification section for differentially amplifying the first electrical signals and the second electrical signals, and for outputting differentially amplified signals as detection signals of the target signal; and a gain adjustment section for varying gains to adjust a signal-to-noise ratio while the reference laser beam is not being radiated into the crystal, so as to match strength levels of the first electrical signals and the second electrical signals in association with feedback signals of the target signal.

摘要翻译： 电光采样示波器有助于调整由电气，光学和温度因素引起的信噪比。 仪器包括：用于产生参考激光束的发光部分; 呈现电光响应行为以便接收参考激光束并导致根据由目标信号产生的电场强度改变折射率的晶体; 反射镜，其形成在晶体的后表面上，用于反射已经通过晶体的参考激光束; 用于将从反射镜反射的参考激光束分离成第一信号光和第二信号光的光学电路; 第一光电转换部分，用于将第一信号光转换成第一电信号; 第二光电转换部分，用于将第二信号光转换成第二电信号; 差分放大部分，用于差分放大第一电信号和第二电信号，并用于输出差分放大的信号作为目标信号的检测信号; 以及增益调整部分，用于在参考激光束不被辐射到晶体中时改变增益以调节信噪比，以便与反馈相关联地匹配第一电信号和第二电信号的强度电平 目标信号的信号。

公开(公告)号：US06087838A

公开(公告)日：2000-07-11

申请号：US189044

申请日：1998-11-09

申请人： Nobuaki Takeuchi ,  Yoshiki Yanagisawa ,  Jun Kikuchi ,  Yoshio Endou ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Junzo Yamada

发明人： Nobuaki Takeuchi ,  Yoshiki Yanagisawa ,  Jun Kikuchi ,  Yoshio Endou ,  Mitsuru Shinagawa ,  Tadao Nagatsuma ,  Junzo Yamada

IPC分类号： G01R15/24 ,  G01R1/07 ,  G01R13/34 ,  G01R19/00 ,  G01R31/302 ,  H01L21/66 ,  G01R31/308

CPC分类号： G01R1/071

摘要： A signal processing circuit is provided for an electro-optic probe, which is used to perform testing of a printed-circuit board of high-speed processing. When laser beams are incident on the electro-optic probe which is brought into contact with the printed-circuit board, they are changed in polarization and are then converted to electric signals. The electric signals are amplified and are then subjected to analog-to-digital conversion to produce digital data. The laser beams (or optical pulses) are generated based on sampling pulses used for sampling of the analog-to-digital conversion. Herein, the sampling pulses are created based on a sweep signal and a step-like signal. The sweep signal increases in level with a certain slope and then decreases suddenly in one period of a trigger pulse signal. The step-like signal increases in level in a step-like manner, wherein it is increased by a predetermined level in response to each of the sampling pulses. A comparator produces a pulse signal consisting of pulses, each of which appears when the sweep signal coincides with the step-like signal in levels. Then, a mask circuit allows output of only the necessary pulses of the comparator as the sampling pulses. An image display circuit stores a plurality of digital data therein, which are then rearranged in an order so that an image representing a measurement result is displayed.

摘要翻译： 为电光探头提供信号处理电路，用于对高速处理的印刷电路板进行测试。 当激光束入射到与印刷电路板接触的电光探针上时，它们被改变为极化，然后被转换成电信号。 电信号被放大，然后进行模数转换以产生数字数据。 基于用于模数转换的采样的采样脉冲产生激光束（或光脉冲）。 这里，采样脉冲基于扫描信号和阶梯状信号产生。 扫描信号以一定的斜率增加，然后在触发脉冲信号的一个周期内突然减小。 阶梯状信号以阶梯式的方式增加，其中响应于每个采样脉冲增加预定电平。 比较器产生由脉冲组成的脉冲信号，当脉冲信号与阶梯状信号一致时，出现脉冲信号。 然后，掩模电路仅允许输出比较器的必要脉冲作为采样脉冲。 图像显示电路在其中存储多个数字数据，然后按顺序重新排列，以便显示表示测量结果的图像。