Circuit to transfer a signal between different voltage domains and corresponding method to transfer a signal

A method for operating a level shifter, comprising:

• controlling, with a pulse generator, a first current generator of a first current path coupled between a floating supply voltage and ground;
• controlling, with the pulse generator, a second current generator of a second current path coupled between the floating supply voltage and ground;
• and
• causing, with a negative bootstrap circuit, a first terminal of a first bootstrap capacitor of the first current path to have a voltage lower than ground, the first terminal of the first bootstrap capacitor being coupled between a second terminal of the first bootstrap capacitor and the first current source.

A method of operating a level shifter, comprising:

• outputting a first pulse signal and a second pulse from a pulse generator;
• controlling, with the first pulse signal, a first current source of a first current path coupled between a floating voltage and a negative bootstrap circuit, the first current path including the first current generator coupled through a first resistor to the floating voltage at a first node of the first current generator;
• and
• controlling, with the second pulse signal, a second current source of a second current path coupled between the floating voltage and the negative bootstrap circuit, the second current path including the second current generator coupled through a second resistor to the floating voltage at a first node of the second current generator;
• and
• inducing a voltage lower than ground at a first terminal of a first bootstrap capacitor of the negative bootstrap circuit by selectively applying either a first voltage potential or a second voltage potential to a second terminal of the first bootstrap capacitor based on the first pulse signal or the second pulse signal, wherein the first terminal of the first pump capacitor is coupled to a second node of the first current generator.

A method of operating a level shifter, comprising:

• inducing a negative voltage on a first terminal of a bootstrap capacitor of a negative bootstrap circuit, the first terminal of the bootstrap capacitor coupled to a first node of a current generator;
• by selectively coupling a second terminal of the bootstrap capacitor to either a first voltage potential or a second voltage potential through a first inverting buffer;
• controlling, with a pulse signal, a transistor coupled between the first terminal of the pump capacitor and the second voltage potential;
• and
• outputting, with a selection circuit, one of the first voltage potential or the second voltage potential at the first terminal of the bootstrap capacitor to a control terminal of the transistor based on the pulse signal.