Power supplying circuit and power supplying method

摘要

A power supplying circuit for generating an output voltage, which comprises: a noise detecting circuit, for receiving a first reference voltage and for generating a second reference voltage according to the output voltage and the first reference voltage, wherein a noise component of the second reference voltage is the same as which of the output voltage; a control voltage generating unit, for receiving a feedback voltage and the second reference voltage, and for generating a control voltage according to the feedback voltage and the second reference voltage; a voltage providing device, for generating the output voltage according to the control voltage and an input voltage; and a feedback module, for generating the feedback voltage according to the output voltage.

主权项

1. A power supplying circuit, for generating an output voltage, comprising:
a noise detecting circuit, comprising at least one resistor, for receiving a first reference voltage and for generating a second reference voltage according to the output voltage and the first reference voltage, wherein a noise component of the second reference voltage is related to a noise component of the output voltage; a control voltage generating unit, for receiving a feedback voltage and the second reference voltage, and for generating a control voltage according to the feedback voltage and the second reference voltage; a voltage providing device, for generating the output voltage according to the control voltage and an input voltage; and a feedback module, comprising at least one resistor, for generating the feedback voltage according to the output voltage; wherein the noise detecting circuit comprises an isolating circuit to isolate an effect that the resistor of the noise detecting circuit and the resistor of the feedback module cause to each other.