Glitch detection and method for detecting a glitch
First Claim
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1. A circuit comprising:
- 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 configured to be electrically connected between a first terminal configured to be coupled to a MEMS transducer and the comparator of the glitch detection circuit, wherein the switch is configured to connect the first terminal to the comparator of the glitch detection circuit when the switch is on, and is configured to disconnect the first terminal 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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18 Claims
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1. A circuit comprising:
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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 configured to be electrically connected between a first terminal configured to be coupled to a MEMS transducer and the comparator of the glitch detection circuit, wherein the switch is configured to connect the first terminal to the comparator of the glitch detection circuit when the switch is on, and is configured to disconnect the first terminal from the comparator of the glitch detection circuit when the switch is off. - View Dependent Claims (2, 3, 4, 5)
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6. A method of operating a circuit, the method comprising:
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electrically connecting a signal node of a first system to a comparator of a glitch detection circuit using a switch during a first mode, the first system comprising a first capacitor having a capacitance proportional to a pressure level; detecting a signal glitch on the signal node of the first 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 first system from the comparator of the glitch detection circuit using the switch during a second mode. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A circuit comprising:
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a first plate terminal configured to be coupled to a first plate of a first capacitor; a second plate terminal configured to be coupled to a second plate of the first capacitor; a first circuit comprising an amplifier configured to be coupled to the first plate terminal and configured to amplify an input signal from the first plate terminal, and a charge pump circuit coupled to the second plate terminal and configured to apply a bias voltage to the first capacitor via the second plate terminal; a switch coupled to the first plate terminal; and a second circuit coupled to the first plate terminal through the switch, wherein the second circuit comprises a sampling circuit coupled to the first plate terminal via the switch 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 terminal via the switch and coupled to 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 (13, 14, 15, 16, 17, 18)
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Specification