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公开(公告)号：US5153667A
公开(公告)日：1992-10-06
申请号：US617615
申请日：1990-11-26
CPC分类号： G01R15/24 , G01R1/071 , G01R13/347 , G01R15/242
摘要： A light beam is chopped and split into two beams. Intensity of a first beam is changed by using, e.g., an electrooptic material in accordance of a change in a signal to be detected, such as a voltage in an electronic device, and detected by a first photodetector. On the other hand, a second beam is detected by a second photodetector without being subjected to the intensity change. At least one of the outputs of the first and second photodetectors are adjusted so that they become equal to each other when no signal is applied to the light intensity changing means. The difference of the thus adjusted output signals is detected by, e.g., a lock-in amplifier in a narrow band at the chopping frequency.
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公开(公告)号：US5053696A
公开(公告)日：1991-10-01
申请号：US147098
申请日：1988-01-20
CPC分类号： G04F13/026 , G01R13/347 , G02F1/0327
摘要： A system for time-resolving ultra-short electrical waveforms of up to a few hundred gigahertz bandwidth is presented. The system utilizes a fast electro-optic modulator capable of subpicosecond responsivity. A CW (continuous wave) laser is used to probe the change in birefringence resulting in the modulator due to an induced electric field. The rapid change in the transmitted optical signal due to an equally rapid changing electric field (picosecond pulse) is then detected and temporally dispersed using a picosecond resolution streak camera. The modulator operates in a region close to minimum transmission where the average optical power is below the damage threshold for the photocathode of the streak camera and where small electrical signals can significantly modulate the transmitted beam. The system can be used in either sampling mode where the modulation and subsequent detection are repeated and the data accumulated at repetition rates as high as 100 MHz or in single shot mode.
摘要翻译： 提出了一种用于时间分辨高达几千兆赫兹带宽的超短电波形的系统。 该系统利用了能够承受亚秒级响应的快速电光调制器。 使用CW（连续波）激光来探测由于感应电场而导致调制器的双折射变化。 然后使用皮秒分辨率条纹相机检测并瞬时分散由于同等快速变化的电场（皮秒脉冲）引起的透射光信号的快速变化。 调制器在接近最小透射率的区域中工作，其中平均光功率低于条纹照相机的光电阴极的损伤阈值，而小电信号可以显着调制透射光束。 该系统可以在采样模式下使用，其中重复调制和后续检测，并以高达100MHz或单次拍摄模式的重复率累积数据。
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公开(公告)号：US4891581A
公开(公告)日：1990-01-02
申请号：US218795
申请日：1988-07-14
申请人： Yoshihiro Takiguchi
发明人： Yoshihiro Takiguchi
CPC分类号： G01R13/00 , G01R13/347
摘要： An apparatus for sampling, analyzing and displaying an electrical signal as disclosed having a good signal-to-noise ratio and high resolution. The apparatus includes a light pulse source for emitting a light pulse toward the electro-optical surface of a photoelectron sampling tube which in turn emits a photoelectron pulse after receiving the light pulse. The emitted photoelectron pulse is then modulated by a signal to be measured and is accelerated to an anode which may comprise a display for displaying the wave form of the electrical signal as a two-dimensional image.
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84.发明授权
公开(公告)号：US4875006A
公开(公告)日：1989-10-17
申请号：US239577
申请日：1988-09-01
IPC分类号： G01R31/302 , G01R1/07 , G01R13/34 , G01R19/00 , G01R31/00 , G01R31/265 , G01R31/308 , G01R31/309
CPC分类号： G01R1/071 , G01R13/347 , G01R31/2656 , G01R31/308 , G01R31/309
摘要： A high-speed test system for semiconductor integrated circuits utilizes electro-optic sampling techniques to perform tests at data rates up to 1.2 Gb/s. The receiver portion of the tester has a 4.5 GHz bandwidth and can perform ECL level functional test with one sampling pulse per vector. A device under test is positioned in a test head with an electro-optic birefringent crystal sensor positioned below the device under test to minimize signal path length. A system control unit includes a Nd: YAG modelocked laser which generates optical pulses, and optical transmission means directs the optical pulses to an array of reflective contacts on the sensor. The sensor functions as a Pockels cell with the electric field in the crystal sensor due to voltages on the array of contacts changing the transmission of polarized light through the crystal. Reflected pulses are received and converted to electrical signals indicative of the voltages on the array of contacts on the electro-optic sensor.
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85.发明授权Process for the sampling of an electric signal varying over time and apparatus for the implementation and application of this process 失效用于随时间变化的电信号采样的过程以及用于实施和应用该过程的装置
公开(公告)号：US4864522A
公开(公告)日：1989-09-05
申请号：US160249
申请日：1988-02-25
CPC分类号： G01M11/3109 , G01R13/347
摘要： In a process for the sampling of an electric signal changing over time, an electron beam (12) is deflected laterally and linearly over time and at the same time modulated in its intensity according to the instantaneous amplitude of the electric signal. The electron beam (12) generates on a fluorescent screen (14) a brightness-modulated bar of light, which is preferably sampled with a sensor (15) arranged ahead of the fluorescent screen (14) in the form of a CCD line camera having a linear array of sensor elements (15a, b, c).The read-out analog sampled values of the sensor (15) are subsequently digitized and further processed.The advantage of the process is its high broad-bandedness and resolution and the capability of being able to carry out an averaging without additional expenditure of time.
摘要翻译： 在随时间变化的电信号取样的过程中，电子束（12）随时间横向和线性地偏转，同时根据电信号的瞬时幅度在其强度下进行调制。 电子束（12）在荧光屏（14）上产生亮度调制的光束，其优选地以安装在荧光屏（14）前方的传感器（15）采样，该传感器呈CCD线照相机的形式，其具有 传感器元件（15a，b，c）的线性阵列。 传感器（15）的读出模拟采样值随后被数字化并进一步处理。 该过程的优点是其广泛的分辨率和分辨率，以及能够进行平均而没有额外的时间花费的能力。
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公开(公告)号：US4734576A
公开(公告)日：1988-03-29
申请号：US858413
申请日：1986-05-01
CPC分类号： G01R15/241 , G01R13/347
摘要： An electro-optic sampler comprises a body of semiconductor material that can be energized to emit polarized light, a photodetector device for generating an electrical output signal representative of the intensity with which light polarized in a predetermined manner is incident on the photodetector device, and a body of electro-optic material defining an optical waveguide for transmitting light from the source of polarized light to the photodetector. First and second electrodes are provided for establishing an electrical field within the body of electro-optic material. The body of electro-optic material has a spherical index ellipsoid when the first and second electrodes are at the same potential and otherwise has a non-spherical index ellipsoid.
摘要翻译： 电光采样器包括能够被激发以发射偏振光的半导体材料体，用于产生表示以预定方式偏振的光入射到光电检测器件上的强度的电输出信号的光电检测器装置，以及 限定用于将光从偏振光源透射到光电检测器的光波导的电光材料体。 提供第一和第二电极用于在电光材料的主体内建立电场。 当第一和第二电极处于相同的电位时，电光材料的主体具有球形折射椭圆体，否则具有非球形折射椭球。
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公开(公告)号：US4030840A
公开(公告)日：1977-06-21
申请号：US670468
申请日：1976-03-25
申请人： Robert A. Lawton , James R. Andrews
发明人： Robert A. Lawton , James R. Andrews
IPC分类号： G01R13/34
CPC分类号： G01R13/347
摘要： A waveform sampler, for cooperation with a conventional sampling oscilloscope, has, as part of a bridge circuit, two Gallium Arsenide photoconductors mounted on a 50 ohm stripline. One GaAs photoconductor, the sampling photoconductor, is illuminated. The other GaAs photoconductor remains dark and functions as a common mode compensating photoconductor. To sample an unknown electrical waveform traversing the stripline the electrical wave is optically strobed by illuminating the sampling GaAs photoconductor with pulses of light from a laser. To sample an unknown optical waveform the optical wave is focused on the sampling GaAs photoconductor and an electrical strobe signal is sent through the stripline. Outputs from each of the photoconductors are amplified in high input impedance FET amplifiers and after electrical compensation they are passed to a conventional difference amplifier. The difference output is further amplified and fed to a conventional sampling oscilloscope. The sampling oscilloscope provides a conventional DC feedback control voltage to stabilize the bridge circuit and a strobe synchronization pulse for controlling either the electrical or optical strobe. A trigger pulse that is in advance of the signal being sampled is derived from the unknown signal and supplied to the sampling oscilloscope.
摘要翻译： 与常规采样示波器配合使用的波形采样器作为桥接电路的一部分，安装在50欧姆带状线上的两个砷化镓光电导体。 一个GaAs光电导体，采样光电导体被照亮。 其他砷化镓光电导体保持较暗，并且用作共模补偿光电导体。 为了对穿过带状线的未知电波采样，通过用来自激光的光脉冲照射采样GaAs光电导体来光电选择电波。 为了对未知的光学波形进行采样，将光波集中在采样GaAs光电导体上，并通过带状线发送电选通信号。 来自每个感光体的输出在高输入阻抗FET放大器中被放大，并且在电补偿之后，它们被传递到常规的差分放大器。 差分输出进一步放大并馈送到常规采样示波器。 采样示波器提供常规的直流反馈控制电压以稳定桥接电路和选通同步脉冲，用于控制电气或光学频闪。 在被采样的信号提前的触发脉冲是从未知信号导出的并提供给采样示波器。
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公开(公告)号：US3614451A
公开(公告)日：1971-10-19
申请号：US3614451D
申请日：1968-08-19
申请人： IBM
发明人： GUNN JOHN B
CPC分类号： G02F1/0344 , G01R1/071 , G01R13/347
摘要： A sampling system is described which utilizes electrooptic techniques for sampling an electrical signal. Short duration light pulses are polarized and directed through a crystal exhibiting either a linear or longitudinal electrooptic effect or through a liquid showing a large Kerr effect, located in traveling wave relationship with a terminated transmission line structure. The group velocity of the polarized light, that is, the velocity of a light pulse, or the velocity, of the modulation envelope of a modulated light beam, along the electrooptic crystal and the phase velocity of the electrical signal along the transmission line structure are in synchronism. Due to electrically induced birefringence, the state of polarization of the light pulse is altered according to the electrical field intensity to which the electrooptic crystal is subjected by that portion of the electrical signal traveling coincidentally along the transmission line structure. Consequently, the transmission of the light pulse by a crossed analyzer placed at the output of the electrooptic crystal varies in response to the coincidental portion of the electrical signal. The energy of the light pulse emanating from the analyzer is detected and directed to a utilization of circuit, for example, the hold and display circuitry of a sampling oscilloscope.
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