Charge pump initialization device, integrated circuit having charge pump initialization device, and method of operation

An integrated circuit, comprising:

• a charge pump initialization device, the charge pump initialization device comprising:
• a driving circuit coupled to a first power supply node and a second power supply node, the driving circuit comprising a driver, a first resistance circuit, a first node between the driver and the resistance circuit, and first and second switches coupled to one another in series, the driving circuit being coupled to an output electrode of a capacitor though the first node;
• and
• a bias voltage circuit comprising a second node between a second resistance circuit and a third resistance circuit, third and fourth switches being coupled to one another in series, fifth and sixth switches being coupled to one another in series, and a fourth resistance circuit being coupled to a third node, the second node being coupled to a control terminal of the driving circuit, the third and fourth switches being coupled to the third node, the fifth and sixth switches being coupled to the fourth resistance circuit, the bias voltage circuit being coupled to an input electrode of the capacitor through the third switch,
• wherein the integrated circuit is configured to receive
• an initialization signal for controlling the second, fourth and sixth switches, and
• an input signal for controlling the first, third and fifth switches.

A method of operating a charge pump comprising:

• in an initialization phase,
• supplying a first signal to an input electrode of a capacitor and an initialization device;
• supplying a second signal to the initialization device;
• supplying an output signal to an output electrode of the capacitor responsive to the second signal, the output signal having at least two levels;
• and
• causing a charge to be accumulated in the capacitor responsive to the first signal and the output signal;
• and
• in a pumping operation phase following the initialization phase,
• placing the output electrode of the capacitor in a floating state, and
• performing a pumping action with the charge accumulated in the capacitor.