Patent ID: 7667490

Claim:
A voltage shifter circuit, comprising: a pull-up circuit, connected to a first voltage source; a pull-down circuit, connected between the pull-up circuit and a ground terminal and connected to an input signal source, adapted to make the voltage shifter circuit output a modulated pulse signal having a high voltage of a first voltage and a low voltage of zero with an operation together with the pull-down circuit; a node, at which the pull-up circuit and the pull-down circuit are connected; a control circuit, comprising: a second inverter, one input terminal of which is connected to the node and the other input terminal is connected to the first voltage source, adapted to invert a node voltage and output an inverted node voltage as an output signal of the voltage shifter circuit; a first delayer, connected to the second inverter, adapted to delay the inverted node voltage; and a control sub-circuit in the pull-up circuit, a first input terminal of which is connected to the first delayer, a second input terminal of which is connected to the first voltage source, a third input terminal of which is connected to the inverted input signal and an output terminal of which is connected to the pull-up circuit, adapted to turn off the pull-up circuit when the input signal source changes to a high voltage from a low voltage.