Efficient charge pump capable of high voltage operation
AssigneeTexas Instruments Incorporated
InventorsTimothy P. Pauletti, David Baldwin, John H. Carpenter, Jr.
Life of this patent
Estimating the term…
Abstract
A high voltage integrated circuit operable in a system having a low voltage reference, a high voltage reference, and a ground, for providing an output voltage higher than the high voltage reference. The integrated circuit includes a high voltage ground reference circuit, operable to provide a high voltage ground reference node. Also included is an oscillator, operable to provide a clock signal, the oscillator being connected to the high voltage reference and to the high voltage ground reference node. An isolated charge pump circuit is provided, operable to generate the output voltage and isolated in the integrated circuit from other circuitry.
Claims6
A high voltage integrated circuit operable in a system having a low voltage reference, a high voltage reference, and a ground, for providing an output voltage higher than the high voltage reference, comprising:
- a bias current generator stage coupled to receive the low voltage reference to generate a bias current;
- a high voltage ground reference circuit coupled to receive the bias current, the low voltage reference, the high voltage reference and ground, the high voltage ground reference circuit operable to provide a high voltage ground reference node;
- an oscillator, operable to provide a clock signal, the oscillator being connected to the high voltage reference and to the high voltage ground reference node;
- and
- an isolated charge pump circuit coupled to receive the clock signal, the high voltage reference and an inverted clock signal, the isolated charge pump circuit operable to generate the output voltage.
Dependencies are inferred from the claim text.