Self-calibrated voltage regulator
First Claim
1. A voltage regulator, comprising:
- an input node;
an output node;
a driving circuit coupled to the input node and the output node, the driving circuit configured to generate an output voltage at the output node from an input voltage at the input node;
a feedback circuit coupled to the output node, the feedback circuit configured to generate a feedback voltage based on the output voltage;
a first control circuit coupled to the feedback circuit and the driving circuit, the first control circuit configured to control the output voltage based on the feedback voltage;
an output stage resistor having opposite first and second terminals, the first terminal of the output stage resistor coupled to the output node; and
a second control circuit coupled to the second terminal of the output stage resistor and the feedback circuit, the second control circuit configured to control the feedback voltage based on a regulated voltage at the second terminal of the output stage resistor.
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Accused Products
Abstract
A voltage regulator includes a driving circuit, a feedback circuit, first and second control circuits and a resistor. The driving circuit is coupled to an input node and an output node and generates an output voltage at the output node from an input voltage at the input node. The feedback circuit is coupled to the output node and generates a feedback voltage based on the output voltage. The first control circuit is coupled to the feedback circuit and the driving circuit to control the output voltage based on the feedback voltage. The resistor has opposite first and second terminals. The first terminal of the resistor is coupled to the output node. The second control circuit is coupled to the second terminal of the output stage resistor and the feedback circuit to control the feedback voltage based on a regulated voltage at the second terminal of the resistor.
31 Citations
20 Claims
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1. A voltage regulator, comprising:
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an input node; an output node; a driving circuit coupled to the input node and the output node, the driving circuit configured to generate an output voltage at the output node from an input voltage at the input node; a feedback circuit coupled to the output node, the feedback circuit configured to generate a feedback voltage based on the output voltage; a first control circuit coupled to the feedback circuit and the driving circuit, the first control circuit configured to control the output voltage based on the feedback voltage; an output stage resistor having opposite first and second terminals, the first terminal of the output stage resistor coupled to the output node; and a second control circuit coupled to the second terminal of the output stage resistor and the feedback circuit, the second control circuit configured to control the feedback voltage based on a regulated voltage at the second terminal of the output stage resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A voltage regulator, comprising:
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an input node; an output node; a driving transistor including a first terminal coupled to the input node, a second terminal coupled to the output node, and a gate terminal; a voltage divider including a first resistor coupled between the output node and an intermediate node, and a second resistor coupled between the intermediate node and a voltage supply terminal, wherein at least one of the first resistor or the second resistor is a variable resistor; a first operational amplifier including a first input coupled to a reference voltage node, a second input coupled to the intermediate node of the voltage divider, and an output coupled to the gate terminal of the driving transistor; an output stage resistor having opposite first and second terminals, the first terminal of the output stage resistor coupled to the output node; and a second operational amplifier including a first input coupled to a set voltage node, a second input coupled to the second terminal of the output stage resistor, and an output coupled to the variable resistor of the voltage divider for controlling a resistance value of the variable resistor. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A process of operating a voltage regulator, the process comprising:
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receiving an input voltage at an input node of the voltage regulator; generating, from the input voltage, an output voltage at an output node of the voltage regulator, the output node coupled to a first terminal of an output stage resistor; generating a feedback voltage based on the output voltage; controlling the generation of the output voltage based on the feedback voltage; and controlling the generation of the feedback voltage based on a regulated voltage at a second terminal of the output stage resistor. - View Dependent Claims (19, 20)
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Specification