Apparatus for maintaining a low power loss within an input stage

Details Apparatus for maintaining a low power loss within an input stage Apparatus for maintaining a low power loss within an input stage

1992-07-14

1994-04-19

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307303, 307322, H03K 3313, H03K 315

Patent

active

053048580

ABSTRACT:
An input stage for programmable controllers in which a Schmitt trigger and a two-terminal configuration having a negative resistance characteristic are combined in an integrated circuit. A first resistor supplementing this bipolar configuration to form a constant-current sink is connected externally of the integrated circuit in parallel with the bipolar configuration. A power loss mainly develops in the first resistor which is external of the integrated circuit so that multi-channel input stages are able to be realized cost-effectively without requiring a supply of cooling air to cool the integrated circuit. A second resistor may be connected external of the integrated circuit in series with the two-terminal configuration to further reduce power loss within the integrated circuit and to limit the current flowing into the integrated circuit.

REFERENCES:
patent: 2923840 (1960-02-01), Ellsworth
patent: 3219935 (1965-11-01), Katakami
patent: 3371226 (1968-02-01), Ortel
patent: 3525038 (1970-08-01), Felt et al.
patent: 3581122 (1971-05-01), Gaunt
patent: 4443716 (1984-04-01), Avery
patent: 4574276 (1986-03-01), Sato
patent: 5013933 (1991-05-01), Eisenhart

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