Patent ID: 8624655

Claim:
A level shifter circuit, comprising: a plurality of switching devices connected to a predetermined DC power supply through a resistor and operated by different driving signals; a gain conversion unit operated by first signals output from the plurality of switching devices, respectively, and generating second signals having a level within a predetermined range of the first signals; and a noise removal unit connected to at least one output terminal among the plurality of switching devices to prevent malfunctioning of the gain conversion unit, the gain conversion unit inputting the second signals to a high side gate driver circuit through an inverter circuit, wherein: the plurality of switching devices include a first switching device and a second switching device that are operated by different driving signals to generate different output signals, the gain conversion unit includes a third switching device connected to an output terminal of the first switching device, the noise removal unit includes a fourth switching device connected to an output terminal of the second switching device, and the gain conversion unit includes a current mirror circuit that is controlled by a turning-on and turning-off operation of the third switching device.