Glitch detection and method for detecting a glitch
First Claim
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1. A circuit comprising:
- a MEMS system;
a glitch detection circuit comprising a comparator coupled to an input of the glitch detection circuit, the glitch detection circuit configured to detect a signal glitch at the input of the glitch detection circuit and produce a glitch detection signal at an output of the glitch detection circuit via the comparator when the signal glitch is detected; and
a switch having a controllable conductive path electrically connected between the MEMS system and the comparator of the glitch detection circuit, wherein the switch is configured to connect the MEMS system to the comparator of the glitch detection circuit when the switch is on, and is configured to disconnect the MEMS system from the comparator of the glitch detection circuit when the switch is off.
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Abstract
System and method for detecting a glitch is disclosed. An embodiment comprises increasing a bias voltage of a first capacitor, sampling an input signal of a first plate of the first capacitor with a time period, mixing the input signal with the sampled input signal, and comparing the mixed signal with a reference signal.
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Citations
20 Claims
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1. A circuit comprising:
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a MEMS system; a glitch detection circuit comprising a comparator coupled to an input of the glitch detection circuit, the glitch detection circuit configured to detect a signal glitch at the input of the glitch detection circuit and produce a glitch detection signal at an output of the glitch detection circuit via the comparator when the signal glitch is detected; and a switch having a controllable conductive path electrically connected between the MEMS system and the comparator of the glitch detection circuit, wherein the switch is configured to connect the MEMS system to the comparator of the glitch detection circuit when the switch is on, and is configured to disconnect the MEMS system from the comparator of the glitch detection circuit when the switch is off. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating a circuit, the method comprising:
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electrically connecting a signal node of a MEMS system to a comparator of a glitch detection circuit using a switch during a first mode; detecting a signal glitch on the signal node of the MEMS system using the glitch detection circuit; using the comparator, generating a glitch detection signal at an output of the glitch detection circuit based on the detecting; and electrically disconnecting the signal node of the MEMS system from the comparator of the glitch detection circuit using the switch during a second mode. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A circuit comprising:
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a first capacitor comprising a first plate and a second plate; a first circuit coupled to the first capacitor, wherein the first circuit comprises an amplifier coupled to the first plate and configured to amplify an input signal from the first plate, and a charge pump circuit configured to apply a bias voltage to the first capacitor; a switch coupled to the first capacitor; and a second circuit coupled to the first capacitor through the switch, wherein the second circuit comprises a sampling circuit coupled to the first plate and configured to generate a sampled signal by sampling the input signal with a sampling time period when the switch is conducting, a subtractor coupled to the first plate and the sampling circuit, wherein the subtractor is configured to generate a subtracted signal by subtracting the sampled signal from the input signal when the switch is conducting, a reference circuit configured to generate a reference signal, and a comparator coupled to the reference circuit and the subtractor, wherein the comparator is configured to compare the reference signal with the subtracted signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification