Reference current generating circuit for generating a constant c

Details Reference current generating circuit for generating a constant c Reference current generating circuit for generating a constant c

1994-12-23

1997-05-20

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327538, 327546, 327513, G05F 302

Patent

active

056316003

ABSTRACT:
A constant current generating circuit is provided with a first current generating circuit unit which generates a first current having a positive temperature dependency and includes a pair of first and second bipolar transistors, a first current mirror circuit comprised of a plurality of first MOS transistors which regulates a current density ratio of the currents fed to the first and second bipolar transistors to be constant and derives the first current and a first circuit disposed between the first and second bipolar transistors and the first current mirror circuit for limiting dependency of the currents flowing through the first and second bipolar transistors on a voltage of a power source applied to the first current mirror circuit, a second current generating circuit unit is also provided which generates a second current having as negative temperature dependency and which includes a third bipolar transistor and a second resistor through which the second current is derived. Also, a summing current generating circuit unit is provided which sums the first current and the second current and generates a constant current with substantially no temperature dependency representing the summed current. This summary current generating circuit unit includes a second current mirror circuit comprised of a plurality of second MOS transistors which generates the constant current representing the summed current.

REFERENCES:
patent: 5001362 (1991-03-01), Tran
patent: 5352934 (1994-10-01), Khan
patent: 5391980 (1995-02-01), Thiel et al.
patent: 5394026 (1995-02-01), Yu et al.
patent: 5430395 (1995-07-01), Ichimaru
patent: 5440277 (1995-08-01), Ewen et al.

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