Abstract: There is provided a noise canceling circuit that includes a first source terminal, a second source terminal, an output terminal, a reference voltage generator for generating a reference voltage, a bias current generator for generating a bias current determining an operating current, a voltage-current generator for generating an output of a power circuit, a voltage divider for detecting a fluctuation of an output voltage at the output terminal, and an error amplifier for amplifying an error voltage between said reference voltage and an output voltage from the voltage divider.

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.