Signal path monitor
AssigneeAllegro MicroSystems, LLC
InventorsEzequiel Rubinsztain, Pablo Javier Bolsinger
Life of this patent
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Abstract
A method for testing a signal path in a sensor, the signal path including a filter circuit and a comparator circuit, the method including: closing a first signal line that is arranged to bypass a first capacitor in the filter circuit; injecting a test signal into the signal path after the first signal line is closed; and detecting whether a signal that is output by the comparator circuit in response to the test signal satisfies a predetermined condition.
Claims20
A method for testing a signal path in a sensor, the signal path including a filter circuit and a comparator circuit, the method comprising:
- closing a first signal line that is arranged to bypass a first capacitor in the filter circuit, the first signal line having a first end and a second end, the first end being coupled to a first node in the signal path that is located downstream from the first capacitor, and the second end being coupled to a second node in the signal path that is located upstream from the first capacitor;
- injecting a test signal into the signal path after the first signal line is closed;
- and
- detecting whether a signal that is output by the comparator circuit in response to the test signal satisfies a predetermined condition.
A system, comprising:
- a signal processor;
- one or more sensing elements;
- a signal path that is arranged to couple the one or more sensing elements to the signal processor, the signal path including a comparator circuit and a filter circuit, the filter circuit including a first capacitor;
- and
- a diagnostic circuit configured to:
- close a first signal line that is arranged to bypass the first capacitor in the filter circuit, inject a test signal in the signal path after the first signal line is closed, and detect whether a signal that is output by the comparator circuit in response to the test signal satisfies a predetermined condition,
- wherein the first signal line has a first end and a second end, the first end being coupled to a first node in the signal path that is located downstream from the first capacitor, and the second end being coupled to a second node in the signal path that is located upstream from the first capacitor.
A system, comprising:
- a signal processor;
- one or more sensing elements;
- a signal path that is arranged to couple the one or more sensing elements to the signal processor, the signal path including a comparator circuit and a filter circuit, the filter circuit including a capacitor;
- and
- a diagnostic circuit configured to:
- close a first signal line that is arranged to bypass the capacitor in the filter circuit, inject a test signal in the signal path after the first signal line is closed, and detect whether a signal that is output by any component of the signal path, in response to the test signal, satisfies a respective predetermined condition,
- wherein the first signal line has a first end and a second end, the first end being coupled to a first node in the signal path that is located downstream from the capacitor, and the second end being coupled to a second nod in the signal path that is located upstream from the capacitor.
Dependencies are inferred from the claim text.