Cross coupled N-channel negative pump

A charge pump circuit comprising:

• a first pumping stage comprising a first path and a second path for charge delivery;
• a second pumping stage comprising a third path and a fourth path for charge delivery, the second pumping stage coupled to the first pumping stage via the first path and the second path, wherein said second pumping stage receives charge from said first pumping stage via the first path and the second path;
• and
• at least a third pumping stage coupled to the second pumping stage via the third path and the fourth path, wherein said third pumping stage receives charge from said second pumping stage via the third path and the fourth path;
• wherein said first path comprises a first switch and said second path comprises a second switch crossed coupled to said first switch, wherein the first switch and the second switch are cross coupled without having transistors disposed therebetween, further wherein said third path comprises a third switch and said fourth path comprises a fourth switch crossed coupled to said third switch, wherein the third switch and the fourth switch are cross coupled without having transistors disposed therebetween.

A charge pump circuit comprising:

• a first input node and a second input node for receiving first and second input signals, respectively;
• X pumping stages, where X is an integer greater than one, and where pumping stages one through X are coupled consecutively in series and pumping stage one is coupled to the first and second input nodes, wherein each of said X pumping stages comprises:
• a first switch;
• and
• a second switch cross coupled to the first switch,
• wherein each of said X pumping stages receives a first input voltage at an input of said first switch and pumps a first output voltage at an output of said first switch, further wherein each of said X pumping stages receives a second input voltage at an input of said second switch and pumps a second output voltage at an output of said second switch, wherein said first and second output voltages are pumped within a clock cycle;
• and
• an output node coupled to pumping stage X for providing an output voltage;
• wherein said first and second switches comprise transistors, further wherein a well in which said transistors in each of said X pumping stages are formed is biased by the output voltage.

A method of pumping an output voltage, said method comprising:

• first pumping a first output of a first pumping stage from a first input voltage to a first output voltage;
• second pumping a second output of the first pumping stage from a second input voltage to a second output voltage;
• and
• biasing a well in which pumping transistors in the first pumping stage are formed with the output voltage;
• wherein said first pumping and said second pumping occur in one clock cycle.