Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1986-05-19
1987-08-25
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307491, 307494, H03K 5153, H03K 524
Patent
active
046895000
ABSTRACT:
An improved comparator circuit of the type which includes first and second differential PNP transistors operating in conjunction with a current mirror circuit includes an additional dual collector PNP transistor. That is, while the reference voltage is applied to the base of one of the differential transistors, the input voltage to be compared with the reference voltage applied to the emitter of the dual collector's transistor which has a first collector coupled to the base of the other differential transistor. The second collector is coupled to the base of the additional transistor. In this manner, should the input voltage fall below the substrate voltage, the additional transistor will be reverse biased thus preventing the parasitic diode at the base of the second differential transistor from turning on.
REFERENCES:
patent: 3213293 (1965-10-01), Finlon et al.
patent: 4418290 (1983-11-01), Nagano
Gray Randall C.
Hess Robert M.
Jarrett Robert B.
Li Edward E.
Ingrassia Vincent B.
Motorola Inc.
Zazworsky John
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