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US 9,436,196 B2Granted
Voltage regulator and method
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorHao-Chieh Chan
Life of this patent
Estimating the term…
Abstract
A device includes a voltage buffer, a load compensation circuit, and a closed-loop current feedback circuit. The voltage buffer is configured to output an output voltage and an output current. The output current is the sum of a load current and a bias current. The load compensation circuit is configured to output the bias current at a variable level based on a variation in the load current. The closed-loop current feedback circuit is configured to feedback a voltage level based on the variation to the load compensation circuit.
Claims20
A device comprising:
- a voltage buffer comprising first and second transistors and being configured to output an output voltage and an output current, the output current being a sum of a load current and a bias current;
- a load compensation circuit configured to output the bias current at a variable level based on a variation in the load current;
- and
- a closed-loop current feedback circuit comprising a current mirror including a third transistor and a fourth transistor and configured to mirror the output current, the closed-loop current feedback circuit configured to feedback a voltage level based on the variation to the load compensation circuit,
- wherein the first transistor of the voltage buffer comprises a drain electrode coupled with a gate electrode of the first transistor.
2 more elements
A device comprising:
- a resistive divider configured to output a reference voltage;
- an amplifier circuit configured to output a first voltage equal to the reference voltage;
- a voltage buffer comprising first and second transistors and being configured to output an output voltage equal to the first voltage;
- a closed-loop current feedback circuit comprising a current mirror including a third and a fourth transistor and configured to output a second voltage based on an output current of the voltage buffer;
- and
- a load current compensation circuit configured to vary the output current and a second current of the voltage buffer based on the second voltage,
- wherein the first transistor of the voltage buffer comprises a drain electrode coupled with a gate electrode of the first transistor.
4 more elements
A method comprising:
- outputting an output voltage at a predetermined value using a voltage buffer of a voltage regulator, the voltage buffer comprising first and second transistors, the first transistor having a drain electrode coupled with a gate electrode of the first transistor;
- sensing a change in output current of the voltage buffer using a current mirror of a closed-loop current feedback circuit to mirror the output current;
- the current mirror including at least two transistor different from the first and the second transistors of the voltage buffer;
- and
- restoring the output current to a target value by changing a bias current of a variable current source in response to the change in the output current.
2 more elements
Dependencies are inferred from the claim text.