CMOS bandgap voltage reference apparatus and method

Details CMOS bandgap voltage reference apparatus and method CMOS bandgap voltage reference apparatus and method

1988-11-07

1989-07-18

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323907, G05F 330

Patent

active

048496847

ABSTRACT:
An improved CMOS bandgap voltage reference in which a magnified current derived from a thermal voltage reference produces a voltage drop across a resistor. The resistor in turn couples to a single bipolar transistor which is part of the thermal voltage reference. The bandgap voltage is the sum of the voltage across the resistor and the voltage across the bipolar transistor. In addition, the immunity of a bandgap voltage reference to variations in power supply variations is improved by having a differential amplifier sense the voltages at the control current input and the output of a current mirror in the thermal voltage reference portion of the bandgap voltage reference and adjusting the power supply voltage to the thermal voltage reference until the sensed voltages are substantially the same.

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patent: 4795918 (1989-01-01), Menon et al.
"A Low-Voltage CMOS Bandgap Reference", IEEE Journal of Solid-State Circuits, vol. SC-14, No. 3, Jun. 1979, Eric A. Vittoz, Member IEEE and Olivier Neyroud, pp. 573 through 577.
"Analysis and Design of Analog Integrated Circuits", Second Edition, Paul R. Gray, Robert G. Meyer, University of California, Berkeley, Published by John Wiley & Sons, Inc., Copyright 1977, 1984, pp. 733 through 737.

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