Method and apparatus for controlling a circuit with a high voltage sense device
First Claim
1. A circuit, comprising:
- a first transistor disposed in a first substrate having first, second and third terminals, the first terminal of the first transistor coupled to an external voltage, wherein a voltage provided at the third terminal of the first transistor is substantially proportional to a voltage between the first and second terminals of the first transistor when the voltage between the first and second terminals of the first transistor is less than a pinch-off voltage of the first transistor, wherein the voltage provided at the third terminal of the first transistor is substantially constant and less than the voltage between the first and second terminals of the first transistor when the voltage between the first and second terminals of the first transistor is greater than the pinch-off voltage of the first transistor;
a control circuit disposed in the first substrate and coupled to the third terminal of the first transistor; and
a second transistor disposed in a second substrate, a first terminal of the second transistor coupled to the external voltage.
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Accused Products
Abstract
A control circuit with a high voltage sense device. In one embodiment, a circuit includes a first transistor disposed in a first substrate having first, second and third terminals. A first terminal of the first transistor is coupled to an external voltage. A voltage provided at a third terminal of the first transistor is substantially proportional to a voltage between the first and second terminals of the first transistor when the voltage between the first and second terminals of the first transistor is less than a pinch-off voltage of the first transistor. The voltage provided at the third terminal of the first transistor is substantially constant and less than the voltage between the first and second terminals of the first transistor when the voltage between the first and second terminals of the first transistor is greater than the pinch-off voltage of the first transistor. The circuit also includes a control circuit disposed in the first substrate and coupled to the third terminal of the first transistor. The circuit further includes a second transistor disposed in a second substrate. A first terminal of the second transistor coupled to the external voltage.
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Citations
15 Claims
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1. A circuit, comprising:
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a first transistor disposed in a first substrate having first, second and third terminals, the first terminal of the first transistor coupled to an external voltage, wherein a voltage provided at the third terminal of the first transistor is substantially proportional to a voltage between the first and second terminals of the first transistor when the voltage between the first and second terminals of the first transistor is less than a pinch-off voltage of the first transistor, wherein the voltage provided at the third terminal of the first transistor is substantially constant and less than the voltage between the first and second terminals of the first transistor when the voltage between the first and second terminals of the first transistor is greater than the pinch-off voltage of the first transistor; a control circuit disposed in the first substrate and coupled to the third terminal of the first transistor; and a second transistor disposed in a second substrate, a first terminal of the second transistor coupled to the external voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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sensing an external voltage coupled to a first transistor disposed on a first substrate; providing an output voltage from the first transistor that is substantially proportional to the external voltage when the external voltage is less than a pinch-off voltage of the first transistor, wherein the output voltage provided from the first transistor is substantially constant and less than the external voltage when the external voltage is greater than the pinch-off voltage of the first transistor; and switching a second transistor disposed on a second substrate with a control circuit disposed on the first substrate. - View Dependent Claims (12, 13, 14, 15)
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Specification