发明名称 |
Signal processing circuit for electro-optic probe |
摘要 |
<p>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.</p> |
申请公布号 |
EP0918224(A2) |
申请公布日期 |
1999.05.26 |
申请号 |
EP19980309173 |
申请日期 |
1998.11.10 |
申请人 |
ANDO ELECTRIC CO., LTD.;NIPPON TELEGRAPH AND |
发明人 |
TAKEUCHI, NOBUAKI;YANAGISAWA, YOSHIKI;KIKUCHI, JUN;ENDOU, YOSHIO;SHINAGAWA, MITSURU;NAGATSUMA, TADAO;YAMADA, JUNZO |
分类号 |
G01R15/24;G01R1/07;G01R13/34;G01R19/00;G01R31/302;H01L21/66;(IPC1-7):G01R1/07 |
主分类号 |
G01R15/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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