Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1984-11-13
1987-06-23
Heyman, John S.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307280, 307567, 307310, 307443, H03K 1704, H03K 508
Patent
active
046755489
ABSTRACT:
A transistor-transistor logic gate circuit arrangement for saturation control while providing TTL input and output compatibility. The circuit comprises a resistor divider network coupled across the base emitter junction of a phase splitter transistor. A preselected fraction of the phase splitter's V.sub.BE is produced at the base of an antisaturation transistor. The antisaturation transistor is coupled across the collector-base of an output transistor thereby providing a method of clamping an output transistor using V.sub.BE as a reference voltage. Because V.sub.BE is used as the reference, the circuit can maintain TTL output voltage levels while preventing the output transistor from saturating in an extremely wide range of operating temperatures.
REFERENCES:
patent: 3160765 (1962-10-01), Krossa
patent: 3676713 (1972-07-01), Wiedmann
patent: 4109166 (1978-08-01), Clark, Jr. et al.
"Analysis and Design of Digital Integrated Circuits", by David Hodges and Horace Jackson, 1983, McGraw Hill, pp. 255-261.
Harris Corporation
Heyman John S.
Krawczyk Chuck C.
Roseen Richard
Troner William A.
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