Precision current source

Details Precision current source Precision current source

1981-12-21

1983-08-16

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323316, G05F 320

Patent

active

043993990

ABSTRACT:
A circuit for providing an output current the magnitude of which is substantially independent to variations in the power supply voltage applied thereto. The circuit comprises first and second current sourcing transistors, and a conventional .DELTA.V.sub.be /R current mirror circuit for setting the current sourced from the two transistors. At least one output transistor having its base and emitter electrodes coupled in parallel with the base and emitter electrodes of the two transistors is included for sourcing the output current. An operational amplifier having its inverting and non-inverting inputs connected with respective collectors of the two transistors and its output connected to the commonly connected bases of the two transistors and the output transistor is provided which maintains the collectors of the two transistors at equal potential levels even though the magnitude of the power supply voltage may vary so that the current produced at the collector of the output transistor does not vary substantially.

REFERENCES:
patent: 3914683 (1975-10-01), van de Plassche
patent: 3962592 (1976-06-01), Thommen et al.
patent: 4217539 (1980-08-01), Okada
patent: 4292584 (1981-09-01), Kusakabe
patent: 4350904 (1982-09-01), Cordell

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