Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-03-03
1999-06-15
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
323313, 327540, 327541, G05F 110
Patent
active
059125802
ABSTRACT:
A voltage reference circuit capable of realization of two reference voltages having different temperature coefficients is provided. This circuit includes a first bipolar transistor, a second bipolar transistor, and first, second, and third resistors. An emitter of the first transistor is directly connected to a fixed voltage level. An emitter of the second transistor is connected to the fixed voltage level through the first resistor. A collector of the first transistor is connected to a base of the second transistor. A collector of the second transistor is connected to a base of the first transistor. A first end of the second resistor is connected to the connection point of the collector of the first transistor and the base of the second transistor. A first end of the third resistor is connected to the connection point of the collector of the second transistor and the base of the first transistor. The first transistor is driven by a first driving current through the second resistor. The second transistor is driven by a second driving current through the third resistor. A first reference voltage is derived from a second end of the second resistor. A second reference voltage is derived from a second end of the third resistor.
REFERENCES:
patent: 3930172 (1975-12-01), Dobkin
patent: 4491780 (1985-01-01), Neidorff
patent: 5399914 (1995-03-01), Brewster
patent: 5432432 (1995-07-01), Kimura
Callahan Timothy P.
NEC Corporation
Zweizig Jeffrey
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