A Secret Weapon For Anti-Tamper Digital Clocks



Clock-signals with uneven duty cycles could possibly be detected by utilizing twin circuits: 1 pushed through the clock sign and another driven through the negated clock signal. Without the twin circuits, the frequency may be slowed down undetectably by rising the reset interval but keeping the evaluation interval consistent.

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One more facet of the invention could reside within an apparatus for detecting clock tampering, comprising a circuit that gives a monotone sign, a plurality of resettable delay line segments, and an Appraise circuit. The circuit gives the monotone sign through a clock evaluate time frame connected to a clock. The plurality of resettable delay line segments delay the monotone sign to deliver a respective plurality of delayed monotone alerts.

twenty five. The tactic for detecting voltage tampering as described in claim 23, wherein using the clock to result in the Consider circuit comprises utilizing a clock edge at an conclusion of your Examine time frame to result in the Consider circuit.

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22. An equipment for detecting clock tampering, comprising: a first circuit that provides a first monotone signal in the course of a first clock Appraise time frame linked to a clock;

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Resettable hold off line segments between a resettable delay line phase linked to a minimal delay time along with a resettable hold off line phase associated with a utmost delay time are Just about every affiliated with discretely escalating delay situations. An Appraise circuit is brought on by a clock and employs the plurality of delayed monotone signals to detect a voltage fault.

The procedure from the invention could detect a lot quicker- and slower-than-anticipated clock frequencies. It also may perhaps detect a set up-time violation from the monotone signal to perception faster than predicted frequencies or glitches. A substantial adjust in the number of setup-time violations could possibly be detected PROENC to provide an adaptive ecosystem insensitive sensor.

19. The apparatus for detecting clock tampering as described in declare eighteen, whereby the drinking water amount quantity is decided based upon delayed monotone indicators from a number of preceding clock evaluate time.

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