Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1976-12-21
1977-09-20
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307215, 307299A, 357 36, H03K 1908
Patent
active
040499758
ABSTRACT:
In a non-gold-doped TTL device to be energized by a potential supply of at least 4.5 volts; the charge carrier concentration within a NPN multi-emitter input transistor is reduced by connecting together the base and the collector; undesirable emitter-to-emitter transistor action is prevented, by reducing the inverse current gain factor of the input transistor, and preventing this transistor from saturating, by providing a diode within the phase splitter stage, to ensure that the input threshold level of the device is at least two forward biased diode potentials above the least positive supply rail; and providing a suitable pull-up stage for the output transistor, which pull-up stage may comprise a modified Darlington pair of transistors, including a resistor between the emitter of the first transistor and the base of the second transistor, and a resistor between the base and the emitter of the second transistor.
REFERENCES:
patent: 3676713 (1972-07-01), Wiedmann
patent: 3828202 (1974-08-01), Stopper
patent: 3934157 (1976-01-01), Evans
Ferranti Limited
Heyman John S.
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