Detecting voltage glitches
First Claim
1. An apparatus comprising:
- a filter circuit that receives an input signal and generates in response a filtered signal; and
a comparison circuit that receives the input signal and the filtered signal, and outputs in response a comparison output signal having a first level when a magnitude of the filtered signal is less than or substantially equal to a magnitude of the input signal and a second level when the magnitude of the filtered signal is greater than the magnitude of the input signal;
wherein the filter circuit is configured to generate the filtered signal including applying a first transfer function to the input signal when the magnitude of the input signal is substantially constant or increasing, and applying a second transfer function to the input signal when the magnitude of the input signal is decreasing.
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Accused Products
Abstract
In some implementations, an apparatus includes a filter circuit that receives an input signal and generates in response a filtered signal; and a comparison circuit that receives the input signal and the filtered signal, and outputs in response a comparison output signal having a first level when a magnitude of the filtered signal is less than or substantially equal to a magnitude of the input signal and a second level when the magnitude of the filtered signal is greater than the magnitude of the input signal. The filter circuit can be configured to generate the filtered signal including applying a first transfer function to the input signal when the magnitude of the input signal is substantially constant or increasing, and applying a second transfer function to the input signal when the magnitude of the input signal is decreasing.
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Citations
28 Claims
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1. An apparatus comprising:
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a filter circuit that receives an input signal and generates in response a filtered signal; and a comparison circuit that receives the input signal and the filtered signal, and outputs in response a comparison output signal having a first level when a magnitude of the filtered signal is less than or substantially equal to a magnitude of the input signal and a second level when the magnitude of the filtered signal is greater than the magnitude of the input signal; wherein the filter circuit is configured to generate the filtered signal including applying a first transfer function to the input signal when the magnitude of the input signal is substantially constant or increasing, and applying a second transfer function to the input signal when the magnitude of the input signal is decreasing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method comprising:
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receiving an input signal; determining if a magnitude of the input signal is increasing or remaining substantially constant, or decreasing; generating a filtered signal including applying a first transfer function to the input signal if the magnitude is increasing or remaining substantially constant, and applying a second, different transfer function to the input signal if the magnitude is decreasing; and comparing the filtered signal and the received input signal and providing an output signal having a first level if a magnitude of the filtered signal is less than or equal to the magnitude of the input signal and a second level if the magnitude of the filtered signal is greater than the magnitude of the input signal. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A method comprising:
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generating an input signal corresponding to a level of a supply voltage of a device; determining if the level is increasing or remaining substantially constant, or decreasing; generating a filtered signal including applying a first transfer function to the input signal if the level is increasing or remaining substantially constant, and applying a second, different transfer function to the input signal if the level is decreasing; and asserting an alarm signal if a magnitude of the filtered signal exceeds a magnitude of the input signal. - View Dependent Claims (25, 26, 27, 28)
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Specification