Dual feedback voltage regulator
AssigneeQuantefi Corporation
InventorSriramasubramanya Ayyagari
Life of this patent
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Abstract
A voltage regulator may comprise an output node, a pass device, a first feedback circuit, and a second feedback circuit. The output node may be operable to be coupled to a load. The pass device may be operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a p-channel transistor. The first feedback circuit may be operable to adjust the voltage applied to the pass device based on an output node voltage. The second feedback circuit may be operable to adjust the voltage applied to the pass device based on a change to the output node voltage.
Claims20
A voltage regulator, comprising:
- an output node operable to be coupled to a load;
- a pass device operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a p-channel transistor;
- a first feedback circuit operable to adjust the voltage applied to the pass device based on an output node voltage, wherein the first feedback circuit comprises an error amplifier and a resistor divider coupled between the output node and an input of the error amplifier;
- and
- a second feedback circuit operable to adjust the voltage applied to the pass device based on a change to the output node voltage, wherein the second feedback circuit comprises a capacitor coupled in parallel with a resistor of the resistor divider.
A voltage regulator comprising:
- an output node operable to be coupled to a load;
- a pass device operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a p-channel transistor;
- a first feedback circuit operable to adjust the voltage applied to the pass device based on an output node voltage, wherein the first feedback circuit comprises an error amplifier and a resistor divider coupled between the output node and an input of the error amplifier;
- a second feedback circuit operable to reduce an impedance of the output node by using a voltage follower;
- and
- a circuit operable to increase a phase margin of the voltage regulator.
A voltage regulator, comprising:
- an output node operable to be coupled to a load;
- a pass device operable to pass current to the output node based on a voltage applied to the pass device, wherein the pass device comprises a pass device p-channel transistor;
- and
- a first feedback circuit operable to adjust a voltage output to the pass device based on an output node voltage, wherein the first feedback circuit comprises an error amplifier and a resistor divider coupled between the output node and an input of the error amplifier;
- a second feedback circuit comprising a second feedback circuit first n-channel transistor and a second feedback circuit second n-channel transistor, wherein the second feedback circuit is operable to reduce an impedance of the output node by using a voltage follower;
- and
- a circuit comprising one or more circuit transistors in a mirror configuration to increase one or more of a power supply rejection ratio (PSRR) bandwidth or a transient response of the voltage regulator.
Dependencies are inferred from the claim text.