Linear voltage regulator with zero mobile compensation

A method of circuit operation in a low drop out voltage regulator comprising:

• accepting a reference voltage at an input stage having an error amplifier and a buffer stage;
• controlling a power transistor by a signal generated at an output of the buffer stage to produce an output signal of the voltage regulator at an output terminal;
• and
• varying a zero of the voltage regulator based on a load current value of the output signal generated at the output terminal of the voltage regulator, wherein varying a zero comprises changing a resistance value of an RC circuit by changing a gate voltage of a resistive transistor, wherein changing a gate voltage of a resistive transistor comprises:
• sensing a signal at the output of the buffer stage by a sensing transistor;
• and
• modulating a gate voltage signal coupled to a gate terminal of the resistive transistor based on the signal sensed by the sensing transistor.

A method of circuit operation in a low drop out voltage regulator comprising:

• accepting a reference voltage at an input stage having an error amplifier and a buffer stage;
• controlling a power transistor by a signal generated at an output of the buffer stage to produce an output signal of the voltage regulator at an output terminal;
• and
• dynamically moving a zero of the voltage regulator to a higher frequency as the load current of the output signal generated at the output terminal of the voltage regulator raises, wherein dynamically moving a zero comprises changing a resistance value of an RC circuit by changing a gate voltage of a resistive transistor, wherein changing a gate voltage of a resistive transistor comprises:
• sensing a signal at the output of the buffer stage by a sensing transistor;
• and
• modulating a gate voltage signal coupled to a gate terminal of the resistive transistor based on the signal sensed by the sensing transistor.