Circuit configuration for producing negative voltages, charge pump having at least two circuit configurations and method of operating a charge pump

A charge pump for generating negative voltages, comprising:

• at least two circuit configurations connected in series, said circuit configurations including a first circuit configuration, and each of said circuit configurations including:
• an input connection and an output connection;
• first and second clock signal connections;
• a first MOS transistor having a first connection connected to said input connection, a second connection connected to said output connection, and a gate connection;
• a first capacitor connected between said gate connection of said first transistor and said first clock signal connection;
• a second MOS transistor having a first connection connected to said gate connection of said first transistor, a second connection connected to said second connection of said first transistor, and a gate connection connected to said first connection of said first transistor;
• a second capacitor having a first connection connected to said second connection of said first transistor and a second connection connected to said second clock signal connection;
• a third transistor having a first connection connected to said second connection of said first transistor, a second connection connected to backgates of said first and second transistors, and a gate connection connected to said first connection of said first transistor;
• a third capacitor having a first connection connected to said first connection of said first transistor and a second connection connected to backgates of said first and second transistors;
• and
• said first, second and third MOS transistors produced in a triple well structure;
• and
• said input connection of said first circuit configuration connected to ground potential.