Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1981-02-18
1982-06-15
Shoop, William M.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
307297, 323907, G05F 320
Patent
active
043353460
ABSTRACT:
The current flowing through a reference resistor constitutes the temperature independent output voltage. This current consists of the sum of a first and second current. The first current is a current which is proportional to absolute temperature and has an amplitude which depends on the value of the first resistor. The second current is proportional to the base-emitter voltage of a transistor and its amplitude depends on the value of the second resistor. The values of the first and second resistor are fixed so that the temperature coefficient of the current flowing through the reference resistor is zero. Specifically, one end of the reference resistor is connected to one side of the operating voltage source while the other side is connected through a series circuit including the emitter-collector circuit of the first transistor and the first resistor to ground potential. A second circuit is connected in parallel with the first circuit. The second circuit consists of the emitter-collector circuit of a second transistor and the second resistor. A semiconductor voltage divider has a first and second tap connected to the base of the first and second transistor, respectively. A constant current is supplied to the voltage divider, either by a constant current source or by a circuit mirroring the current flow through the reference resistor. The values of the first and second resistor are fixed so that the temperature coefficient of the current flowing through the reference resistor is zero.
REFERENCES:
patent: 3831040 (1974-08-01), Nanba et al.
patent: 4150309 (1979-04-01), Tokuda
patent: 4260946 (1981-04-01), Wheatley, Jr.
patent: 4263544 (1981-04-01), Groendijk
IEEE Journal of Solid-State Circuits, vol. SC-11, No. 6, p. 795, Dec. 1976.
Robert & Bosch GmbH
Shoop William M.
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