US 4,362,985 AGranted

Integrated circuit for generating a reference voltage

AssigneeFujitsu Limited

InventorChikara Tsuchiya

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Abstract

A circuit for generating a reference voltage including a first transistor and a second transistor of which the bases being commonly connected together. The area of the emitter of the first transistor being smaller than the area of the emitter of the second transistor, the emitter of the first transistor being connected to the ground, and the emitter of the second transistor being connected to the ground via a first resistor. The circuit also includes a current supply means which supplies an equal current to the collectors of the first and second transistors and a second resistor which is connected between an output terminal and a connection point of the commonly connected bases of the first and second transistors. The circuit additionally includes a current generator circuit which is connected between the connection point of the commonly connected bases and the ground to produce a current which is proportional to the emitter current of the first transistor or the second transistor, such that a constant voltage is generated at the output terminal.

Claims10

Dependent claims

A circuit for generating a reference voltage, comprising:

a first resistor operatively connected to ground;
a first transistor and a second transistor each having bases commonly connected together at a first connection point, each having collectors and each having emitter regions, an area of the emitter region of the first transistor being smaller than an area of the emitter region of the second transistor, the emitter of the first transistor being connected to ground, and the emitter of the second transistor being connected to the first resistor at a second connection point;
current supply means, operatively connected to the collectors of the first and second transistors, for supplying an equal current to the collectors of the first and second transistors;
a second resistor operatively connected between an output terminal and the first connection point of the commonly connected bases of the first and second transistors;
a third resistor operatively connected between said output terminal and a first power supply point;
and
a current generator circuit, operatively connected between the first connection point of the commonly connected bases and ground, for generating a current which is proportional to the emitter current of the first transistor or the second transistor, such that a constant voltage is generated at the output terminal.

4 more elements

Dependencies are inferred from the claim text.