Voltage regulator having an inverse adaptive controller
AssigneeNanopower Solutions, Inc.
InventorShinichi Akita
Life of this patent
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Abstract
A low drop-out (LDO) voltage regulator that has high a PSRR (Power Supply Ripple Rejection) performance and a high load regulation with low current consumption is disclosed. The voltage regulator doses not require any high gain error amplifier that may cause instability in the voltage regulator. A voltage-controlled current-feedback is presented that generates an inverse phase signal and compensation voltage for a ripple noise and dropout voltage, respectively. The voltage-controlled current-feedback generates a negative voltage slope with regard to the power supply voltage, which can cancel the ripple noise at the output terminal. The current-feedback creates a positive coefficient voltage with regard to the load current, which compensates the voltage drop caused by parasitic resistances.
Claims2
Voltage regulator having an inverse adaptive controller comprising;
- a first power supply terminal and a second power supply terminal;
- a reference voltage generator to provide a reference voltage;
- a output buffer generating regulated voltage controlled by an error amplifier;
- a voltage divider to provide a feedback voltage;
- and
- a voltage regulator having a voltage controlled current feedback connected to said reference voltage generator and said error amplifier;
- wherein said voltage controlled current feedback decreases a feedback current inversely with regard to an increment of the said first supply voltage to decrease the reference voltage.
Voltage regulator having a inverse adaptive controller comprising;
- a first power supply terminal and a second power supply terminal;
- a reference voltage generator to provide a reference voltage;
- a output buffer generating regulated voltage controlled by an error amplifier;
- a voltage divider to provide a feedback voltage;
- and
- a voltage regulator having a voltage controlled current feedback connected to said reference voltage generator and said error amplifier;
- wherein said voltage controlled current feedback decreases a feedback current with regard to a decrement of the load current of said output buffer to increase the reference voltage.
Dependencies are inferred from the claim text.