Patent ID: 7605637

Claim:
A voltage multiplier for receiving a constant input voltage, said multiplier comprising: means for generating first and second signals in phase opposition between each other; a charging section that includes: a first charge transfer capacitor having a first terminal, coupled to the first signal, and a second terminal; a second charge transfer capacitor having a first terminal, coupled with the second signal, and a second terminal; a first parasitic capacitance placed between the first terminal of the first charge transfer capacitor and a reference voltage; and a second parasitic capacitance placed between the first terminal of the second charge transfer capacitor and the reference voltage, said charging section being coupled with said input voltage and being suitable for producing an output a multiple voltage that is a multiple of the input voltage; output means receiving said multiple voltage and being suitable for supplying a substantially constant output voltage which is multiple of the input voltage; means suitable for connecting said parasitic capacitances to carry out a charge transfer from one parasitic capacitance to the other; and isolation means for isolating the charging section from the output means while charge is transferred from one parasitic capacitance to the other, wherein: the charging section comprises further means connected to the second terminals of the first and second charge transfer capacitors and suitable for permitting a charge transfer from the first or from the second charge transfer capacitor towards said output means in alternate periods of pumping time; said means suitable for connecting said parasitic capacitances including switch means connected between said parasitic capacitances; said multiplier comprising means suitable for closing said switch means in periods of transition time comprised between two successive periods of pumping time; and the isolation means include means for isolating said charging section from said input voltage, from said first and second signals, and from said output means during said periods of transition time.