Compensation for low drop out voltage regulator

Details Compensation for low drop out voltage regulator Compensation for low drop out voltage regulator

2005-12-20

2005-12-20

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

06977490

ABSTRACT:
A voltage regulator apparatus includes an error amplifier that amplifies a voltage difference between a reference and a sampled output voltage of the voltage regulator apparatus. A driver amplifier has an input that is responsive to the amplified voltage difference to produce a gate driving voltage at its output. An output transistor having a drain, a gate, and a source is also included. The gate is responsive to the gate driving voltage to produce a regulated output voltage at the source. To stabilize the voltage regulator apparatus, a Miller compensation capacitor is provided to feed a sample of the regulated output voltage back to the input of the driver amplifier; and additionally, an Ahuja compensation circuit is provided to feed back a portion of the regulated output voltage back to the input of the driver amplifier.

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Bhupendra K. Ahuja; “An Improved Frequency Compensation Technique for CMOS Operational Amplifiers”; IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6, Dec. 1983, pp. 629-633.
Paul R. Gray/Robert G. Meyer; “MOS Operational Amplifier Design—A Tutorial Overview”; IEEE Journal of Solid-State Circuits, vol. SC-17, No. 6, Dec. 1982; pp. 969-982.

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