Method of operating voltage regulator
First Claim
1. A method of operating a voltage regulator circuit, comprisinggenerating a control signal by an amplifier of the voltage regulator circuit, the control signal being generated based on a reference signal at an inverting input of the amplifier and a feedback signal at a non-inverting input of the amplifier;
- generating, by a driver responsive to the control signal, a driving current flowing toward an output node of the voltage regulator circuit, the driver being coupled between a first power node and the output node;
generating the feedback signal responsive to a voltage level at the output node; and
causing a transistor, coupled between the output node and a second power node, to operate in saturation mode during a period while the voltage regulator circuit is operating,wherein the causing the transistor to operate in saturation mode comprises supplying a bias signal at a gate of the transistor by a bias circuit outside the amplifier.
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Abstract
A method of operating a voltage regulator circuit includes generating a control signal by an amplifier of the voltage regulator circuit. The control signal is generated based on a reference signal at an inverting input of the amplifier and a feedback signal at a non-inverting input of the amplifier. A driving current flowing toward an output node of the voltage regulator circuit is generated by a driver responsive to the control signal, and the driver is coupled between a first power node and the output node. The feedback signal is generated responsive to a voltage level at the output node. A transistor, coupled between the output node and a second power node, is caused to operate in saturation mode during a period while the voltage regulator circuit is operating.
21 Citations
20 Claims
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1. A method of operating a voltage regulator circuit, comprising
generating a control signal by an amplifier of the voltage regulator circuit, the control signal being generated based on a reference signal at an inverting input of the amplifier and a feedback signal at a non-inverting input of the amplifier; -
generating, by a driver responsive to the control signal, a driving current flowing toward an output node of the voltage regulator circuit, the driver being coupled between a first power node and the output node; generating the feedback signal responsive to a voltage level at the output node; and causing a transistor, coupled between the output node and a second power node, to operate in saturation mode during a period while the voltage regulator circuit is operating, wherein the causing the transistor to operate in saturation mode comprises supplying a bias signal at a gate of the transistor by a bias circuit outside the amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating a voltage regulator circuit, comprising:
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outputting a first control signal at a non-inverting output of an amplifier of the voltage regulator circuit, the first control signal being generated based on a reference signal at an inverting input of the amplifier and a feedback signal at a non-inverting input of the amplifier; outputting a second control signal at an inverting output of the amplifier; generating, by a driver responsive to the first control signal, a driving current flowing toward an output node of the voltage regulator circuit, the driver being coupled between a first power node and the output node; generating the feedback signal responsive to a voltage level at the output node; AC coupling the second control signal with a gate of a transistor, the transistor being coupled between the output node and a second power node; and DC biasing the transistor to operate in saturation mode during a period while the voltage regulator circuit is operating, wherein the DC biasing the transistor comprises supplying a bias signal at the gate of the transistor by a bias circuit outside the amplifier. - View Dependent Claims (13, 14, 18, 19)
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15. A method of operating a voltage regulator circuit, comprising:
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generating, by a first transistor, a first driving current flowing toward an output node of the voltage regulator circuit in response to at least a reference voltage and a voltage level at the output node, a gate of the first transistor and the output node being within a feed-back loop; and generating, by a second transistor, a second driving current flowing away from the output node of the voltage regulator circuit during a period while the voltage regulator circuit is operating, a gate of the second transistor being not within the feed-back loop, wherein the generating the second driving current comprises biasing the second transistor to operate in saturation mode during the period while the voltage regulator circuit is operating, the biasing comprising supplying a bias signal at the gate of the second transistor. - View Dependent Claims (16, 17, 20)
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Specification