Charge pump circuit and methods of operation thereof
AssigneeWolfson Microelectronics plc
InventorsJohn P. Lesso, John L. Pennock, Peter J. Frith
Life of this patent
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Abstract
A charge pump circuit and associated method and apparatuses for providing a plurality of output voltages using a single flying capacitor. The circuit includes a network of switches that are operable in a number of different states and a controller for operating the switches in a sequence of states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage and centered on the voltage at the common terminal.
Claims27
A charge pump circuit comprising:
- an input terminal for receiving an input voltage;
- first and second output terminals;
- at most first and second flying capacitor terminals;
- and
- a switch network for interconnecting said input terminal, said first and second flying capacitor terminals and said first and second output terminals to generate a positive output voltage and a negative output voltage that are each substantially equal in magnitude to half the magnitude of said input voltage.
A charge pump circuit comprising:
- an input terminal;
- first and second output terminals;
- a common terminal;
- at most first and second flying capacitor terminals;
- and
- a switch network, said switch network comprising;
- a first switch for coupling the input terminal to the first flying capacitor terminal,
- a second switch for coupling the first flying capacitor terminal to the first output terminal,
- a third switch for coupling the first flying capacitor terminal to said common terminal,
- a fourth switch for coupling the second flying capacitor terminal to said first output terminal,
- a fifth switch for coupling the second flying capacitor terminal to said common terminal, and
- a sixth switch for coupling the second flying capacitor terminal to the second output terminal.
A method of generating a split-rail voltage comprising:
- interconnecting first and second output voltage terminals with an input voltage terminal and at most first and second flying capacitor terminals to generate a positive output voltage and a negative output voltage that are each substantially equal in magnitude to half the magnitude of an input voltage.
Dependencies are inferred from the claim text.