Patent ID: 9294002
Filing Date: 2016-03-22
CPC Classification: G05F,H02M

Claim Text:
1. A power supply circuit, comprising: an input terminal for inputting an input voltage; an output terminal for outputting an output voltage; a first reference voltage terminal and a second reference voltage terminal for inputting a reference voltage; a clock signal terminal for inputting a digital clock signal; a digital power supply circuit, connected to the first reference voltage terminal, the clock signal terminal, the input terminal and the output terminal, including: an analog power supply circuit, connected to the second reference voltage terminal, and, in parallel with the digital power supply circuit, the input terminal and the output terminal, including: wherein the digital power supply circuit controls the output voltage by changing a number of switches in the ON-state, wherein the analog power supply circuit controls the output voltage by changing the equivalent resistance of the output transistor, wherein a minimum equivalent resistance of the output transistor is equal to or lower than a minimum ON-resistance of the plurality of switches, and wherein a magnitude of an oscillation of the output voltage, generated by a delay of the control unit of the digital power supply circuit when changing the number of switches in the ON-state, is reduced by the analog power supply circuit.