SYSTEM FOR SUBSTRATE POTENTIAL REGULATION DURING POWER-UP IN INTEGRATED CIRCUITS
First Claim
1. A circuit for regulating a substrate potential of an integrated circuit comprising:
- a circuit element including;
a first input coupled to a first bias potential;
a second input coupled to a second bias potential;
a third input coupled to a charge pump enable line; and
an output terminal coupled to a substrate of said integrated circuit.
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Accused Products
Abstract
An integrated circuit with body-bias inputs coordinated by a switch at initial power application. A switch coupled to the N-well bias and P-type substrate bias lines of an integrated circuit selectively couples the substrate to ground or the substrate bias supply, depending upon the state of the bias supply lines. During power-up and the initial application of the N-well bias, the substrate is coupled to ground to prevent a leakage induce rise in the substrate potential. Upon sensing the presence of the substrate bias potential on the substrate bias line, the switch couples the substrate to the substrate bias line instead of ground. In another embodiment, a switch indirectly senses the availability of the substrate bias potential by sensing a charge pump enable signal.
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Citations
22 Claims
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1. A circuit for regulating a substrate potential of an integrated circuit comprising:
a circuit element including; a first input coupled to a first bias potential; a second input coupled to a second bias potential; a third input coupled to a charge pump enable line; and an output terminal coupled to a substrate of said integrated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An integrated circuit comprising:
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a substrate; a first well disposed in said substrate; and a circuit element including; a first input coupled to a first bias potential and to said first well; a second input coupled to a second bias potential; a third input coupled to a charge pump enable line; and an output terminal coupled to said substrate. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification