Apparatus and method for over-voltage protection
First Claim
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1. An apparatus comprising:
- a first power supply rail to provide a first power supply;
a second power supply rail to provide a second power supply, wherein the first power supply is higher than the second power supply, wherein a voltage level of the first power supply and a voltage level of the second power supply are higher than a ground voltage on a ground power supply rail;
a first stack of transistors of a same conductivity type, the first stack including a first transistor and a second transistor coupled in series and having a first common node, wherein the first transistor is coupled to the first power supply rail;
a second stack of transistors of an opposite conductivity type to the first stack of transistors, the second stack including a third transistor and a fourth transistor coupled in series and having a second common node, wherein the second stack of transistor is coupled in series to the first stack of transistors and having a third common node, wherein a gate terminal of the third transistor is coupled to a circuitry which is coupled to the second power supply rail; and
a feedback transistor of a same conductivity type of the third transistor coupled to the second common node and a gate terminal of the third transistor of the second stack, wherein the feedback transistor includes a gate terminal which is coupled to the third common node.
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Abstract
An apparatus is provided which comprises: a dual stack voltage driver, wherein the dual stack voltage driver comprises a first stack of transistors, and a second stack of transistors; and one or more feedback transistors each coupled to a transistor of the second stack of transistors.
10 Citations
21 Claims
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1. An apparatus comprising:
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a first power supply rail to provide a first power supply; a second power supply rail to provide a second power supply, wherein the first power supply is higher than the second power supply, wherein a voltage level of the first power supply and a voltage level of the second power supply are higher than a ground voltage on a ground power supply rail; a first stack of transistors of a same conductivity type, the first stack including a first transistor and a second transistor coupled in series and having a first common node, wherein the first transistor is coupled to the first power supply rail; a second stack of transistors of an opposite conductivity type to the first stack of transistors, the second stack including a third transistor and a fourth transistor coupled in series and having a second common node, wherein the second stack of transistor is coupled in series to the first stack of transistors and having a third common node, wherein a gate terminal of the third transistor is coupled to a circuitry which is coupled to the second power supply rail; and a feedback transistor of a same conductivity type of the third transistor coupled to the second common node and a gate terminal of the third transistor of the second stack, wherein the feedback transistor includes a gate terminal which is coupled to the third common node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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a memory; a processor coupled to the memory, the processor including; a first power supply rail to provide a first power supply; a second power supply rail to provide a second power supply, wherein the first power supply is higher than the second power supply, wherein a voltage level of the first power supply and a voltage level of the second power supply are higher than a ground voltage on a ground power supply rail; a first stack of transistors of a same conductivity type, the first stack including a first transistor and a second transistor coupled in series and having a first common node, wherein the first transistor is coupled to the first power supply rail; a second stack of transistors of an opposite conductivity type to the first stack of transistors, the second stack including a third transistor and a fourth transistor coupled in series and having a second common node, and wherein the second stack of transistor is coupled in series to the first stack of transistors and having a third common node,and wherein a gate terminal of the third transistor is coupled to a circuitry which is coupled to the second power supply rail; a feedback transistor of a same conductivity type of the third transistor coupled to the second common node and a gate terminal of the third transistor of the second stack; a capacitor coupled with the gate of the third transistor and the gate of the fourth transistor; and a wireless interface to allow the processor to communicate with another device. - View Dependent Claims (10, 11, 12)
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13. An apparatus comprising:
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a dual stack voltage driver, wherein the dual stack voltage driver comprises a first stack of transistors, and a second stack of transistors, wherein the second stack of transistors is coupled in series to the first stack of transistors; and one or more feedback transistors each coupled to a transistor of the second stack of transistors, wherein each of the gate terminals of the transistors of the second stack transistors are controlled by a separate control node. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a dual stack voltage driver, wherein the dual stack voltage driver comprises a first stack of transistors, and a second stack of transistors, wherein the second stack of transistors is coupled in series to the first stack of transistors; and one or more feedback transistors each coupled to a transistor of the second stack of transistors, wherein each second stack transistor and its adjacent second stack transistor are coupled at a first common node, and wherein the one or more feedback transistors coupled to the second stack transistor includes a gate terminal which is coupled to the first common node. - View Dependent Claims (21)
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Specification