发明名称 |
Counting circuit for measuring pulse spacing, sampling circuit, skew adjusting circuit, and logic analyzing circuit |
摘要 |
<p>There is provided a time counting circuit which measures a pulse spacing of a pulse signal with a high accuracy and exhibits high resistance to variations in power-source voltage. <??>A delay circuit ring consists of a plurality of delay circuits connected in a ring configuration and signal transition is caused to circulate around the delay circuit ring by oscillation. A switch-signal generating circuit outputs first and second switch signals based on the time at which a pulse signal to be measured rises. A row of sampling circuits consists of a plurality of sampling circuits connected to the output terminals of the respective delay circuits and samples the output signals from the delay circuits in response to a direction indicated by the first switch signal. A row of holding circuits consists of a plurality of holding circuits connected to the output terminals of the respective sampling circuits and holds the output signals from the sampling circuits in response to a direction indicated by the second switch signal. An operating circuit calculates the pulse spacing of the pulse signal to be measured based on a logic level signal outputted from the row of holding circuits. <IMAGE></p> |
申请公布号 |
EP0749210(A2) |
申请公布日期 |
1996.12.18 |
申请号 |
EP19960109394 |
申请日期 |
1996.06.12 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
KUSUMOTO, KEIICHI;MATSUZAWA, AKIRA |
分类号 |
G01R23/10;G01R29/02;G06F1/10;G06F11/25;H03K23/00;H03K23/54;H03M1/50;H03M1/64;(IPC1-7):H03M1/50;G01R25/08 |
主分类号 |
G01R23/10 |
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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