发明名称 |
Zeit-konstante Detektionsschaltung und Zeit-konstante Regelungschaltung |
摘要 |
<p>The present invention is to provide a time constant detecting circuit incorporated in an LSI, for detection of the variations of component values of resistors and capacitors in the LSI as the variations of a time constant. A pseudo-resistor 6 composed of a switched capacitor circuit. Analog switches 1 and 3 are exclusively switched on and off alternately in a period of T [sec] to control acapacitor 2 to be charged and discharged. With the operation of the capacitor 2 having a capacitance C, there is formed a pseudo-ressitor 6 of a resistance Rp= T/C, prdetermined DC voltage Vout is divided by a series circuit of the pseudo-resistor 6 and an ordinary resistor 4, and smoothed by a caspacitor 5. Output voltage Vout smoothed and allowed to appear at the output terminal 7 is uniquely defined by a time constant tau =1/RC, so that the variations of the time constant formed with the resistors and capacitors in the LSI can be detected by a measurement of the output voltage Vout. <IMAGE></p> |
申请公布号 |
DE69219749(D1) |
申请公布日期 |
1997.06.19 |
申请号 |
DE1992619749 |
申请日期 |
1992.12.24 |
申请人 |
NEC CORP., TOKIO/TOKYO, JP |
发明人 |
ICHIHARA, MASAKI, NEC CORPORATION, TOKYO, JP |
分类号 |
G01R27/00;G01R29/00;H01L21/822;H01L27/04;(IPC1-7):G01R29/027;G01R27/02 |
主分类号 |
G01R27/00 |
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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