Level shifter and a method for shifting voltage level

A method for controlling a level shifter, wherein the lever shifter comprises:

• an input terminal for receiving an input signal and an output terminal for outputting an output signal,
• a level shift circuit comprising a first control switch for connecting the output terminal to a first supply voltage so as to set the output signal to a first logical value and a second control switch for connecting the output terminal to a signal ground so as to set the output signal to a second logical value, and
• a pre-charge circuit comprising a pre-charging switch for connecting the output terminal to the first supply voltage and an input gate circuit for controlling an ability of the input signal to control the second control switch,
• the method comprising:
• connecting the first supply voltage to a control terminal of the first control switch so as to keep the first control switch non-conductive when the output signal has the second logical value,
• wherein the method comprises connecting a second supply voltage to the control terminal of the first control switch so as to keep the first control switch conductive when the output signal has the first logical value, an electric potential of the second supply voltage being between those of first supply voltage and the signal ground.