Low voltage, high precision current source

Details Low voltage, high precision current source Low voltage, high precision current source

1985-10-21

1987-03-03

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

307495, 307499, 330257, 330300, G05F 320

Patent

active

046478418

ABSTRACT:
A precision current mirror circuit includes first and second transistors the bases of which are coupled together and whose emitters are coupled to ground. The collector of the first transistor is connected to a reference current source for sinking a reference current therefrom while the collector of the second transistor is connected to an output of the current error for sinking a current at the output that substantially mirrors the reference current. A differential amplifier is provided having its non-inverting and inverting inputs coupled to the collectors of the first and second transistors respectively and its output connected to the bases of the two transistors such that the voltage that is established at the output of the current mirror is forced onto the collector of the first transistor. With the two transistors being matched the respective collector-base voltages therefore track which eliminates "Early" voltage errors as well as affects of the lower output impedances of the two transistors.

REFERENCES:
patent: 3914683 (1975-10-01), van de Plassche
patent: 4471236 (1984-09-01), Patterson, III

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