Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1995-06-15
1997-11-11
Berhane, Adolf
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323280, G05F 156
Patent
active
056868200
ABSTRACT:
A voltage regulator, providing a constant-voltage output through an output terminal, includes an operational amplifier and an output stage driven by an output of the amplifier. A voltage reference is applied to a negative input terminal of the amplifier, and an input voltage, which is greater in magnitude than the output voltage, is applied to the output stage. A first feedback loop returns a signal proportional to the output voltage to the positive input of the amplifier. A second feedback loop extends between the output and input of the amplifier, including resistive and capacitative elements to stabilize the voltage regulator. In a version producing a positive output, the voltage reference applies a positive voltage to the amplifier, and the output stage includes a p-channel power MOSFET device. In a version producing a negative output, the voltage reference applies a negative voltage to the amplifier, and the output stage includes an n-channel power MOSFET device. While the input voltage must be greater than the output voltage, the difference between these voltages is minimized with this configuration, improving the efficiency of the voltage regulator.
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Berhane Adolf
Davidge Ronald V.
International Business Machines - Corporation
Tomlin Richard A.
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