Voltage regulator
AssigneeMediaTek Singapore Pte. Ltd.
InventorsYingyi LIU, Kun LAN, Chih-Chien HUANG, Yu-Kai CHOU
Life of this patent
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Abstract
A voltage regulator includes a pass transistor, an operational amplifier and a voltage divider circuit. The pass transistor receives a supply voltage to generate a regulated output voltage according to a control signal. The operational amplifier generates the control signal according to a feedback voltage. The voltage divider circuit generates the feedback voltage at a feedback node according to the regulated output voltage, and includes a string of resistors and a stabilization element. The string of resistors is coupled to the pass transistor and includes multiple resistors. The stabilization element is coupled to the resistors and receives the regulated output voltage.
Claims17
A voltage regulator, comprising:
- a pass transistor, receiving a supply voltage to generate a regulated output voltage according to a control signal;
- an operational amplifier, generating the control signal according to a feedback voltage;
- and
- a voltage divider circuit, generating the feedback voltage at a feedback node according to the regulated output voltage, wherein the voltage divider circuit comprises:
- a string of resistors, coupled to the pass transistor and comprising a plurality of resistors;
- and
- a stabilization element, coupled to the string of resistors and receiving the regulated output voltage.
A voltage regulator, comprising:
- a first transistor, receiving a supply voltage to generate a regulated output voltage at an output node according to a control signal;
- an operational amplifier, generating the control signal according to a difference between a reference voltage and a feedback voltage;
- and
- a voltage divider circuit, generating the feedback voltage at a feedback node according to the regulated output voltage, wherein the voltage divider circuit comprises:
- a string of resistors, coupled to the first transistor and comprising a plurality of resistors;
- and
- a second transistor, coupled to the string of resistors and comprising a gate coupled to the output node.
A voltage regulator, comprising:
- a pass transistor, receiving a supply voltage to generate a regulated output voltage according to a control signal, wherein the control signal is generated according to a feedback voltage;
- and
- a voltage divider circuit, generating the feedback voltage at a feedback node according to the regulated output voltage, wherein the voltage divider circuit comprises:
- a string of resistors, coupled to the pass transistor and comprising a plurality of resistors, wherein the plurality of resistors and a plurality of parasitic capacitance generate a pole in a low frequency region at the feedback node;
- and
- a stabilization element, coupled to the string of resistors and pushing the pole to a high frequency region.
Dependencies are inferred from the claim text.