Detection of Dependent Failures
First Claim
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1. A dependency breaking circuit, comprising:
- a sensing element sensitive to at least one disturbance parameter, andan output coupled with the sensing element, a signal at the output being dependent on the at least one disturbance parameter in a well-defined manner.
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Abstract
Devices and methods are provided which facilitate detecting of a disturbance parameter being outside a predetermined range. Such disturbance parameter may for example cause dependent failures in redundant circuits, for example redundant circuits being arranged on a same substrate.
7 Citations
27 Claims
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1. A dependency breaking circuit, comprising:
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a sensing element sensitive to at least one disturbance parameter, and an output coupled with the sensing element, a signal at the output being dependent on the at least one disturbance parameter in a well-defined manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A functional safety device, comprising:
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a first dependency breaking circuit, comprising; a first sensing element sensitive to at least one disturbance parameter, and a first output coupled with the first sensing element, a signal at the first output being dependent on the at least one disturbance parameter in a well-defined manner; and a second dependency breaking circuit, comprising; a second sensing element sensitive to at least one disturbance parameter, and a second output coupled with the second sensing element, a signal at the second output being dependent on the at least one disturbance parameter in a well-defined manner, wherein a first response of the signal at the first output of the first dependency breaking circuit when the at least one disturbance parameter leaves a specified range differs from a second response of the signal at the second output of the second dependency breaking circuit when the at least one disturbance parameter leaves the specified range. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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10. A functional safety device, comprising:
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a first circuit to provide a predetermined functionality, and a second circuit to provide the predetermined functionality to provide redundancy, and a dependency breaking circuit, comprising; a sensing element sensitive to at least one disturbance parameter, and an output coupled with the sensing element, a signal at the output being dependent on the at least one disturbance parameter in a well-defined manner, wherein the dependency breaking circuit is coupled with the first circuit to modify an output of the first circuit when the at least one disturbance parameter is outside a specified range. - View Dependent Claims (19, 20)
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21. A functional safety device, comprising:
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a first circuit to provide a predetermined functionality when at least one disturbance parameter is within a specified range, and a second circuit to provide the predetermined functionality when the at least one disturbance parameter is within the specified range to provide redundancy, wherein the first circuit is detuned with respect to the second circuit to cause the first signal to deviate from the second signal by more than the predetermined tolerance when the at least one disturbance parameter is outside the specified range. - View Dependent Claims (22, 23)
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24. A method, comprising:
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measuring a first signal at a first output of a circuit on a substrate, the circuit being sensitive to at least one disturbance parameter, measuring a second signal at a second output of the circuit, and deciding that the at least one disturbance parameter is outside a specified range, if a property of the first signal differs from the property of the second signal by more than a predetermined tolerance. - View Dependent Claims (25, 26, 27)
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Specification