Precise current generator

Details Precise current generator Precise current generator

1992-09-23

1996-03-12

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

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

323315, G05F 316

Patent

active

054989523

ABSTRACT:
A current generator which includes a first bipolar transistor, the base of which is connected to a reference voltage and the emitter to ground through a first resistor. A first current mirror is connected to mirror the emitter current of this first transistor. The mirrored current is augmented by the base current of a second transistor (matched to the first transistor), and by current Vbe/R passed by a second resistor (matched to the first transistor), which is connected between the base and emitter of the second transistor. The current thus augmented drives a second current mirror. The output of the second mirror provides a precise reference current, determined by the reference voltage and the resistor magnitude.

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Wang et al., "A voltage-controllable linear MOS transconductor using bias offset technique" 25 IEEE Journal Of Solid-State Circuits, pp. 315-317 (Feb. 1990).
Rudy J. Van de Plassche, "A wide-band monolithic instrumentation amplifier," 10 IEEE Journal Of Solid-State Circuits 424-431 (Dec. 1975).
Pookaiyaudom et al., "An integratable precision voltage-to-currnet converter with bilaterial capability," 13 IEEE Journal Of Solid-State Circuits (Jun. 1978).
Blauschild, "An open loop programmable amplifier with extended frequency range", 16 IEEE Journal Of Solid State Circuits 626-633 (Dec. 1981).
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