Method and system for latchup suppression
First Claim
Patent Images
1. A latchup suppression system comprising:
- a voltage supply configured for applying a voltage to a body terminal of a semiconductor device;
a selective coupling mechanism configured to selectively isolate the body terminal from the voltage-supply responsive to a reference voltage exceeding the voltage at the body terminal; and
a voltage comparator configured to compare the voltage at body terminal to the reference voltage, and configured to control the selective coupling mechanism.
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Abstract
Systems and methods of suppressing latchup. In accordance with a first embodiment of the present invention a latchup suppression system comprises a voltage comparator for comparing a voltage applied to a body terminal of a semiconductor device to a reference voltage. The voltage comparator is also for controlling a selective coupling mechanism. The selective coupling mechanism is for selectively coupling the body terminal to a respective power supply. The latchup suppressing system is preferably independent of a voltage supply for applying a voltage to the body terminal.
110 Citations
38 Claims
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1. A latchup suppression system comprising:
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a voltage supply configured for applying a voltage to a body terminal of a semiconductor device; a selective coupling mechanism configured to selectively isolate the body terminal from the voltage-supply responsive to a reference voltage exceeding the voltage at the body terminal; and a voltage comparator configured to compare the voltage at body terminal to the reference voltage, and configured to control the selective coupling mechanism. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A latchup suppression system comprising:
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a voltage comparator for generating a first control voltage responsive to a relationship of a voltage applied to a body terminal of a semiconductor device and a reference voltage; a plurality of selective coupling transistors for selectively coupling said body terminal to a respective power supply; and a level shifting circuit for accessing said first control voltage to produce a second control voltage for controlling said plurality of selective coupling transistors. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of suppressing latchup in an integrated circuit comprising:
- comparing a body biasing voltage of a body terminal to a desirable reference voltage; and
responsive to said comparing, selectively isolating said body terminal from a respective power supply. - View Dependent Claims (15, 16, 17, 18, 19, 20)
- comparing a body biasing voltage of a body terminal to a desirable reference voltage; and
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21. A method of changing body bias of a semiconductor device comprising:
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isolating a body terminal of the semiconductor device; comparing a voltage of the body terminal to a reference voltage; and responsive to said comparing, selectively coupling the body terminal to a respective power supply. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A latchup suppression system comprising:
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a voltage supply means configured to apply a voltage to a body terminal of a metal oxide semiconductor field effect transistor (MOSFET); a selective coupling means configured to selectively couple the body terminal to a respective power supply means responsive to the body terminal voltage exceeding a reference voltage; and a voltage comparator means configured to compare the voltage applied to the body terminal of the MOSFET to the reference voltage, and configured to control the selective coupling means and wherein the voltage comparator means and the selective coupling means are configured to be controlled independently of the voltage supply configured for applying a voltage to the body terminal of the MOSFET. - View Dependent Claims (29, 30, 31, 32)
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33. A latchup suppression system comprising:
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a voltage comparator means for generating a first control voltage responsive to a relationship of a voltage applied to a body terminal of a semiconductor device and a reference voltage; a plurality of selective coupling transistor means for selectively coupling the body terminal to a respective power supply means; and a level shifting circuit means coupled to receive the first control voltage and for producing a second control voltage for controlling the plurality of selective coupling transistor means. - View Dependent Claims (34, 35, 36, 37, 38)
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Specification