Low voltage current reference circuit with active feedback for P

Details Low voltage current reference circuit with active feedback for P Low voltage current reference circuit with active feedback for P

1996-09-06

1997-12-02

Hecker, Stuart N.

Electricity: power supply or regulation systems

Self-regulating

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

323316, G05F 316

Patent

active

056940335

ABSTRACT:
A current reference circuit includes a first, current mirror transistor having a gate coupled to a first feedback node, a source coupled to a first supply terminal and a drain forming a first reference node. A second, current mirror transistor has a gate coupled to the first feedback node, a source coupled to the first supply terminal and a drain forming a second reference node. A third transistor has a gate coupled to a second feedback node, a source coupled to a second supply terminal and a drain coupled to the first reference node. A fourth transistor has a gate coupled to the second feedback node, a source coupled to the second supply terminal and a drain coupled to the second reference node. A first operational amplifier has a first input coupled to the first reference node, a second input coupled to a bias node and an output forming the first feedback node. A second operational amplifier has a first input coupled to the second reference node, a second input coupled to the bias node and an output forming the second feedback node. The operational amplifiers are active elements which allow the current reference circuit to operate at a very low voltage and have a very low sensitivity to changes in the supply voltage.

REFERENCES:
patent: 4890052 (1989-12-01), Hellums
patent: 5029295 (1991-07-01), Bennett et al.
patent: 5245273 (1993-09-01), Greaves et al.
patent: 5532579 (1996-07-01), Park
patent: 5563503 (1996-10-01), Ng et al.
patent: 5627456 (1997-05-01), Novof et al.
J. Alvarez, H. Sanchez, G. Gerosa, and R. Countryman, "A Wide-Bandwidth Low-Voltage PLL for PowerPC.TM. Microprocessors," IEEE Journal of Solid-State Circuits, vol. 30, No. 4, Apr. 1995, pp. 385-391.

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