Low voltage bias circuit for generating supply-independent bias

Details Low voltage bias circuit for generating supply-independent bias Low voltage bias circuit for generating supply-independent bias

1997-05-19

1998-10-20

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327543, G05F 110

Patent

active

058252363

ABSTRACT:
A CMOS bias circuit capable of operating down to a supply voltage equal to the sum of the threshold voltage and the saturation voltage. It generates a threshold referenced bias voltage which is independent of the supply voltage. This bias voltage is equal to the gate source voltage of a transistor which supplies a current equal to the gate-source voltage of another transistor divided by the resistance of a feedback resistor. Via the feedback resistor, changes in the supply voltage cause counteracting changes in the gate-source voltages of the transistors, resulting in a bias voltage which is substantially constant with changing supply voltage.

REFERENCES:
patent: 5216291 (1993-06-01), Seevinck et al.
P.R. Gray and R.G. Meyer, Analysis and Design of Analog Integrated Circuits, Second Edition, Wiley, New York, 1984, Fig. 4.24A.

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