Electrical transmission or interconnection systems – Switching systems
Patent
1992-12-28
1995-11-14
Wong, Peter S.
Electrical transmission or interconnection systems
Switching systems
333173, 333172, H03H 1112
Patent
active
054669766
ABSTRACT:
A time constant detecting circuit incorporated in an LSI detects variations of component values of resistors and capacitors in the LSI by detecting variations of a time constant. A pseudo-resistor is formed by a switched capacitor circuit and at least two switches which are alternately switched on and off in a period T to control a capacitor to be charged and discharged. With the operation of the capacitor having a capacitance C, there is formed a pseudo-resistor having a resistance R.sub.p =T/C. A predetermined DC voltage is divided by a series circuit of the pseudo-resistor and an ordinary resistor, and smoothed by a capacitor. The output voltage V.sub.out which has been smoothed and appears at the output terminal is uniquely defined by a time constant .tau.=1/RC, so that the variations of the time constant which are dependent on the resistors and capacitors in the LSI can be detected by a measurement of the output voltage V.sub.out.
REFERENCES:
patent: 3603898 (1971-09-01), Dawson et al.
patent: 4498063 (1985-02-01), Makabe et al.
patent: 4644304 (1987-02-01), Temes
patent: 4743872 (1988-05-01), Tanimoto
Krishnan Aditya
NEC Corporation
Wong Peter S.
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