Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1975-08-14
1976-07-20
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307297, 307218, H03K 1700
Patent
active
039708764
ABSTRACT:
An improved CML (Current Mode Logic) gate having voltage and temperature compensating means for maintaining output levels and input thresholds invariant with fluctations in supply voltage and junction temperature. The output of the compensating means, measured with respect to ground, will track variations in supply voltage on a one-to-one basis except that the output is allowed to vary by one V.sub.be with junction temperature. This output is supplied to the base of the constant-current source transistor which feeds the differential amplifier stage of the CML gate and to the base of a constant current source transistor whose collector is coupled to the base of the non-input transistor of the differential amplifier stage of the CML gate. The compensating circuitry includes an output transistor, resistive means for tracking variations in supply voltage, and a temperature compensation network having a temperature compensation factor of zero, both said resistive means and the output of said temperature compensation network are coupled to the base of the output transistor. The temperature compensation network achieves an overall compensation factor of zero by combining a temperature compensating subcircuit having a compensation factor of minus one with a temperature compensating subcircuit having a compensation factor of plus one via a unique voltage divider arrangement.
REFERENCES:
patent: 3419810 (1968-12-01), Xylander
patent: 3573495 (1971-04-01), Xylander
patent: 3579272 (1971-05-01), Foss
patent: 3636384 (1972-01-01), DeWitt
patent: 3668429 (1972-06-01), Ainsworth
Allen William W.
Stopper Herbert
Burroughs Corporation
Davis B. P.
Miller, Jr. Stanley D.
Padgett, Jr. Charles P.
Penn William B.
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