Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1980-09-22
1982-09-21
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307255, 307297, 307299A, 330288, H03K 326, H03K 1760
Patent
active
043509045
ABSTRACT:
An integrated circuit current source (10) has first (16) and second (30) current mirrors regeneratively coupled. The transistors (32, 34) of the second mirror (30) have unequal current densities, so that a resistor (40) connected to the emitter of the lower current density transistor (34) establishes a temperature-dependent output current. One of the transistors (18, 20, 34) has its base and emitter connected together through a modifying resistor (42, 53, 55) to modify the temperature dependence of the output. In one embodiment (10), the modifying resistor (42) connects the base and emitter of the lower current density transistor (34) and increases the temperature dependence of the output to make it directly proportional to the absolute temperature. Other embodiments (52, 54) are disclosed for obtaining both zero and negative temperature coefficient values for the output.
REFERENCES:
patent: 3886435 (1975-05-01), Steckler
patent: 3911353 (1975-10-01), van de Plassche
patent: 4029974 (1977-06-01), Brokaw
patent: 4123698 (1978-10-01), Timko et al.
patent: 4194166 (1980-03-01), Sakai et al.
RCA Tech. Notes, No. 949, "Current Mirror Amplifiers Having Current Gains Less Influenced by the Base Currents of Component Transistors", by J. Radovsky, 12/31/73, pp. 1-7.
Electronic Engineering, "The Design of Constant Current Sources", Jun. 1977, pp. 85-88.
Bell Telephone Laboratories Incorporated
Davis B. P.
Miller, Jr. Stanley D.
Ulbrich Volker R.
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