Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-08-28
1992-07-21
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307359, 307362, H03K 520, H03F 345
Patent
active
051325608
ABSTRACT:
A differential voltage comparator for driving a digital logic gate includes a differential amplifier stage for receiving V.sub.IN and NOT V.sub.IN input signals, a left voltage level shifter for shifting the output of the left side of the differential amplifier by a predetermined voltage, and a differential current source for the differential amplifier biased on one side by the left voltage level shifter and on its other side by a reference voltage. An output voltage level shifter shifts down the output voltage from the differential comparator by a predetermined amount; and applied the shifted voltage to an output terminal. Transistors in the differential current source are matched to transistors in the digital logic gate being driven for providing an offset in the differential current source; the latter along with equating the shift down voltage of the left voltage level shifter to the sum of the reference voltage and output shift down voltage, ensures that when V.sub.IN is equal to NOT V.sub.IN, the level of the output voltage from the comparator is substantially equal to the logic switching point of the digital logic gate.
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Derwent Abstract "MOTI U21 87-192206/27 US 4675-551-A".
L. E. Larson et al., "GaAs Differential Amplifiers", GaAs IC Symposium, pp. 19-22, 1985 IEEE.
Ahmed Adel A.
Miller Stanley D.
Siemens Corporate Research Inc.
Tran Sinh N.
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