Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1986-05-08
1987-08-11
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307362, H03K 5153
Patent
active
046863915
ABSTRACT:
An error-detection circuit (10) employs comparison circuitry (12) to determine whether a SENSE signal is within a range indicated by XPRANGE signals. When the SENSE signal goes into or out of the indicated range, an INRANGE output of the comparison circuitry (12) moves through a predetermined voltage swing from one stable level through a threshold level to another stable level. The passage of the INRANGE signal through the threshold level is an indication to subsequent circuitry that SENSE has passed into or out of the indicated range. According to the present invention, one or other of the levels occupied by the INRANGE signal is separated from the threshold by a voltage that is only a small fraction of the swing between the two levels. As a consequence, the delay between the transition of the SENSE signal and the transition of the INRANGE output of the comparison circuitry is only a small fraction of the time required to complete the voltage swing. Systems, such as automatic testers, that employ a large number of such comparison circuits can therefore employ components that are slower and thus cost less than the component would be required in conventional circuits having the same speed.
REFERENCES:
patent: 4282489 (1981-08-01), DeRienzo
patent: 4500841 (1985-02-01), Morey
R. G. Beistle et al., "Voltage Comparator with Adjustable Trip Point and Hysteresis", IBM Technical Disclosure Bulletin, vol. 18, No. 11, Apr., 1976, p. 3574.
GenRad Inc.
Zazworsky John
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