Patent ID: 7323853

Claim:
A low drop-out (LDO) voltage regulator circuit with common-mode feedback, comprising: an error amplifier with an internal common-mode feedback unit for generating an amplified error voltage, the error amplifier having a first input terminal for receiving a reference voltage, a second input terminal for receiving a feedback voltage, a third input terminal, and an output terminal; a pass device for providing an output voltage to at least one external component, the pass device having an input terminal and an output terminal, the input terminal of the pass device being connected to the output terminal of the error amplifier; a feedback circuit for scaling down the output voltage, the feedback circuit having a first terminal and a second terminal, the first terminal of the feedback circuit being connected to the output terminal of the pass device, the second terminal of the feedback circuit being connected to the second input terminal of the error amplifier; and a compensation circuit for providing frequency compensation, the compensation circuit having a first terminal and a second terminal, the first terminal of the compensation circuit being connected to a common node between the pass device and the feedback circuit, and the second terminal of the compensation circuit being connected to the third terminal of the error amplifier, wherein the internal common-mode feedback unit further comprising two resistor-capacitor devices, each resistor-capacitor device comprising a resistor connected in parallel with a capacitor, each resistor-capacitor device having a first terminal and a second terminal, the first terminals of two resistor-capacitor devices being connected to a transistor.