Constant current source

Details Constant current source Constant current source

1994-10-20

1996-01-30

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327541, 327543, 327513, 323312, G05F 110, G05F 304, H01L 3500

Patent

active

054883288

ABSTRACT:
A constant-current source that contains two substantial identical field effect transistors as well as a simple resistance network. The actual saturation current of one of the field effect transistors is measured and converted by the resistance network into a control voltage for the other field effect transistor which produces the desired constant current. With such a circuit, production tolerances, especially tolerances for field effect transistor, as well as operation-dependent temperature variations can be compensated for within a wide range.

REFERENCES:
patent: 4642552 (1987-02-01), Suzuki et al.
patent: 4716356 (1987-12-01), Vyne et al.
patent: 4760284 (1988-07-01), Taylor
patent: 5065043 (1991-11-01), Bartling et al.
patent: 5166553 (1992-11-01), Kotera et al.
Toumazou C et al., "Design and Application of Gaas Mesfet Current Mirror Circuits", IEE Proceedings G. Electronic Circuits & Systems, vol. 137, No. 2, Part G, Apr. 1, 1990, pp. 101-108.
Lange, K. and K.-H. Locherer, Taschenbuch Der Hochfrequenztechnik, Band 2: Komponenten, Springer-Verlag (1986) pp. M22-M23.

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