Integratable current source circuit for generating an output cur

Details Integratable current source circuit for generating an output cur Integratable current source circuit for generating an output cur

1994-01-18

1995-12-05

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

330288, G05F 326

Patent

active

054732433

ABSTRACT:
An integratable current source circuit for generating an output current proportional to an input current includes a first transistor of one conduction type, and second, third and fourth transistors of the other conduction type. Each of the transistors has a base, a collector and an emitter. The first transistor has a current amplification being greater than current amplifications of the second, third and fourth transistors. An input terminal feeds an input current, and an output terminal taps an output current. A current source on one hand is connected to a reference potential and on the other hand is connected to the emitter of the first transistor and to the base of the second transistor. The collector of the second transistor is connected to the reference potential and the emitter of the second transistor is coupled to the base of the third transistor and to the base of the fourth transistor. The base of the first transistor is connected to the collector of the third transistor and to the input terminal. The collector of the fourth transistor is connected to the output terminal. The collector of the first transistor and the emitters of the third and fourth transistors are connected to a supply potential.

REFERENCES:
patent: 3813607 (1974-05-01), Voorman
patent: 4462005 (1984-07-01), Kusakabe et al.
patent: 5157322 (1992-10-01), Llewellyn
patent: 5164658 (1992-11-01), Kuwahara
patent: 5311146 (1994-05-01), Brannon et al.
IBM Technical Disclosure Bulletin, vol. 32, No. 6B, Nov. 1989, p. 14.
Analysis and design of analog integrated circuits, (Gary) 1984, pp. 234-239.

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