System for controlling switch transistor performance
First Claim
1. A method for controlling performance of a switch transistor, the method comprising the steps of:
- providing a switch transistor, having a first terminal coupled to a first supply voltage, a second terminal coupled to an internal voltage rail, a gate coupled to an activation signal source, and a body coupled to a bias signal source;
providing a bias signal sufficient to induce a negative body bias across the switch transistor when that transistor is shut off;
providing a bias signal sufficient to induce a negative body bias across the switch transistor for a period of time following assertion of an activation signal from the activation signal source that turns the switch transistor on; and
providing a bias signal sufficient to induce a positive body bias across the switch transistor after the period of time.
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Abstract
The present invention provides a system for controlling performance of a switch transistor (106)—one that is implemented within a circuitry segment (100) to shut off a circuitry component (116) when that component is not in use. The switch transistor has a first terminal coupled to a first supply voltage (102), a second terminal coupled to an internal voltage rail (108), a gate coupled to an activation signal source (110), and a body coupled to a bias signal source (114). A bias signal, sufficient to induce a negative body bias across the switch transistor, is applied by the bias signal source when that transistor is shut off. A bias signal, sufficient to induce a negative body bias across the switch transistor, is applied by the bias signal source for a period of time following assertion of an activation signal from the activation signal source that turns the switch transistor on. A bias signal, sufficient to induce a positive body bias across the switch transistor, is applied by the bias signal source after the period of time.
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Citations
19 Claims
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1. A method for controlling performance of a switch transistor, the method comprising the steps of:
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providing a switch transistor, having a first terminal coupled to a first supply voltage, a second terminal coupled to an internal voltage rail, a gate coupled to an activation signal source, and a body coupled to a bias signal source;
providing a bias signal sufficient to induce a negative body bias across the switch transistor when that transistor is shut off;
providing a bias signal sufficient to induce a negative body bias across the switch transistor for a period of time following assertion of an activation signal from the activation signal source that turns the switch transistor on; and
providing a bias signal sufficient to induce a positive body bias across the switch transistor after the period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A semiconductor circuitry segment comprising:
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a switch transistor, having a first terminal coupled to a first supply voltage, a second terminal coupled to an internal voltage rail, a gate coupled to an activation signal source, and a body coupled to a bias signal source;
whereinthe segment is adapted to induce a negative body bias across the switch transistor when the switch transistor is shut off;
the segment is adapted to induce a negative body bias across the transistor for a period of time following assertion of an activation signal from the activation signal source that turns the switch transistor on; and
the segment is adapted to induce a positive body bias across the transistor after the period of time. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification