Patent ID: 7307464

Claim:
A system for providing a voltage, the system comprising: a first transistor including a first gate, a first terminal, and a second terminal, the first terminal configured to receive a first predetermined voltage, the first gate configured to receive a first control signal; a second transistor including a second gate, a third terminal, and a fourth terminal, the second gate configured to receive a second control signal, the third terminal being biased to a second predetermined voltage, the second terminal and the fourth terminal being directly connected to a first node, the first node being associated with a first voltage level; a third transistor including a third gate, a fifth terminal, and a sixth terminal, the third gate configured to receive a third predetermined voltage, the fifth terminal directly connected to the first node; a fourth transistor including a fourth gate, a seventh terminal, and an eighth terminal, the fourth gate directly connected to the first node, the eighth terminal configured to receive the third predetermined voltage; a level shifter configured to receive a third control signal and generate the first control signal; wherein: if the first transistor is turned on, the second transistor is turned off; if the first transistor is turned off, the second transistor is turned on; the sixth terminal and the seventh terminal are directly connected to each other at a second node; the second node is associated with a second voltage level.