Constant current circuit

Details Constant current circuit Constant current circuit

1993-04-02

1994-04-19

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072964, 323315, G05F 302

Patent

active

053048628

ABSTRACT:
In a starting circuit of a constant current circuit utilized in semiconductor integrated circuits, when a starting transistor is turned on upon the application of a power supply potential, a feedback transistor is turned on whereupon a first current mirror circuit, a second current mirror circuit and feedback transistor form a current feedback loop. If a defect, such as disconnection is present, the starting transistor in the starting circuit is prevented from operating. The feedback transistor cannot turn on and the current feedback loop cannot be completed. Making use of such a circuit characteristic, detection of a defect in the circuit can be made simply by checking to see whether or not the circuit operates upon turn-on of the power supply used to power the circuit.

REFERENCES:
patent: 4103249 (1978-07-01), Burdick
patent: 4396883 (1983-08-01), Holloway et al.
patent: 5027004 (1991-06-01), Palara
patent: 5045718 (1991-09-01), Vanderhoydonck et al.
patent: 5063305 (1991-11-01), Minami et al.

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