Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1982-01-11
1984-07-24
Anagnos, Larry N.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307200B, 307290, 307581, H03K 1722, H03K 1730, H03K 17687, H03K 3356
Patent
active
044619634
ABSTRACT:
A MOS power-on reset circuit includes Schmitt trigger circuit and an inverter. The Schmitt trigger circuit comprises first, second, and third depletion transistors serially connected between reference potential and supply voltage. The first and second depletion transistors are connected at a first junction point, and the second and third depletion transistors are connected at a second junction point. The gates of the first and second depletion transistors are commonly connected for receiving an input substrate bias voltage. An enhancement transistor is connected between the first junction point and supply voltage. The gates of the enhancement transistor and the third depletion transistor are commonly connected to the second junction point, which is the output of the Schmitt trigger circuit and which is coupled to the inverter from which the output voltage is taken. The transfer characteristic of the circuit exhibits hysteresis, with two trigger levels of input substrate bias voltage that differ sufficiently in magnitude that a triggering at one level, accompanied by a fluctuation in input voltage, will not cause a spurious triggering at the other level. Undesired oscillation of the circuit is thereby avoided.
REFERENCES:
patent: 3895239 (1975-07-01), Alaspa
patent: 4048524 (1977-09-01), Laugesen et al.
patent: 4196362 (1980-04-01), Maehashi
patent: 4296338 (1981-10-01), Thomas
patent: 4296340 (1981-10-01), Horan
patent: 4297596 (1981-10-01), Eckert
Anagnos Larry N.
Dinardo J. A.
Hudspeth David R.
Mayer R.
Meetin R. J.
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