Reference voltage generating circuit

Details Reference voltage generating circuit Reference voltage generating circuit

1982-10-20

1984-09-18

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323907, G05F 320

Patent

active

044726759

ABSTRACT:
A reference voltage generating circuit comprises a circuit (20) for generating a current having a positive temperature coefficient, a circuit (30) for generating a current having a negative temperature coefficient and a circuit (Q7, Q13, R3) for synthesizing both currents and converting the synthesized current into a reference voltage. The circuit (20) for generating a current having a positive temperature coefficient converts a difference voltage between respective base-emitter voltages of two transistors (Q2, Q3) included therein, both bases of which are connected to each other, into a current through a resistor (R2), while a negative feedback is applied by utilizing a current mirror (Q9.about.Q13). The circuit (30) for generating a current having a negative temperature coefficient converts a voltage between a base and an emitter of a single transistor (Q1) into a current through a resistor (R1) while a negative feedback is applied by utilizing a current mirror (Q5.about.Q7). The current having a positive temperature coefficient and the current having a negative temperature coefficient are synthesized to become a temperature compensated current which is converted into a reference voltage by a resistor (R3). Temperature coefficients of the resistors (R1, R2, R3) are set to be equal and thus are cancelled.

REFERENCES:
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patent: 4263519 (1981-04-01), Schade, Jr.
patent: 4352056 (1982-09-01), Cave et al.
patent: 4359680 (1982-11-01), Hellums et al.
Robt. Dobkin, "1.2 Volt Reference", from National Semiconductor Application Note 56, Dec. 1971.
National Semiconductor Inc. Catalog, (LM113/LM313), pp. 2-8 through 2-10.
Michael P. Timko, "A Two-Terminal IC Temperature Transistor", IEEE Journal of Solid-State Circuits, vol SC-11, No. 6, Dec. 1976.
Dervent Publications, "Electrical Patents Index Profile Booklet", Abstracts of U.S. Pat. No. 4,250,445, 4,249,122 & U.S. Ser. No. 119,539.

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