Security device
AssigneeNXP USA, Inc.
InventorsHenri Verhoeven, Edwin Schapendonk, Oswald Moonen, Matheus Johannus Gerardus Lammers
Life of this patent
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Abstract
One example discloses a security device, including: a bulk security capacitance, including a first endpoint and a second endpoint, and having, a first layer including a first set of conductive elements, the first endpoint, and the second endpoint; and a second layer including a second set of conductive elements; wherein the first set of conductive elements and the second set of conductive elements together form at least two bulk capacitors in series; wherein the first and second layers are separated by a distance; and wherein the first and second endpoints are configured to be coupled to a tamper detection circuit configured to detect a change in the bulk security capacitance.
Claims22
A security device, comprising:
- a bulk security capacitance, including a first endpoint and a second endpoint, and having,
- a first layer including a first set of two conductive elements, the first endpoint, and the second endpoint;
- and
- a second layer including a second set of two conductive elements;
- wherein the first set of conductive elements and the second set of conductive elements together form at least two bulk capacitors in series;
- wherein the first and second layers are separated by a distance;
- and
- wherein the first and second endpoints are configured to be coupled to a tamper detection circuit configured to detect a change in the bulk security capacitance.
A security device, comprising:
- a bulk security capacitance, including a first endpoint and a second endpoint, and having,
- a first layer including a first set of conductive elements, the first endpoint, and the second endpoint;
- and
- a second layer including a second set of conductive elements;
- wherein the first set of conductive elements and the second set of conductive elements together form at least two bulk capacitors in series;
- wherein the first and second layers are separated by a distance;
- wherein the first and second endpoints are configured to be coupled to a tamper detection circuit configured to detect a change in the bulk security capacitance;
- wherein the first layer further includes a third endpoint and a fourth endpoint;
- and
- wherein the first, second, third and fourth endpoints from the bulk capacitors in the security capacitance together form a capacitive Wheatstone Bridge.
Dependencies are inferred from the claim text.