Capacitive isolated voltage domains
First Claim
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1. A device comprising:
- a receiver circuit having a first comparator circuit and a second comparator circuit and configured and arranged toreceive a modulated signal, the modulated signal including a binary data signal encoded according to a communication protocol,provide common mode suppression for current transients, anddemodulate the modulated signal to retrieve the binary data signal byusing the first comparator circuit to detect the absence of a first signal state of the modulated signal,using the second comparator circuit to detect the absence of a second signal state of the modulated signal, anddetermine the absence of a carrier signal in the modulated signal in response to the absence of both the first signal state and the second signal state.
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Abstract
In some embodiments, a receiver circuit is configured to receive a modulated signal from a transmitter that is galvanically isolated from the receiver circuit. The receiver circuit is configured to demodulate the modulated signal by using two comparator circuits that respectively detect the presence or absence of first and second signal states of a carrier signal. Based on the detection of the first and second states, the receiver circuit determines whether the carrier signal is present or absent in the modulated signal to determine a demodulated value of the modulated signal.
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Citations
21 Claims
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1. A device comprising:
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a receiver circuit having a first comparator circuit and a second comparator circuit and configured and arranged to receive a modulated signal, the modulated signal including a binary data signal encoded according to a communication protocol, provide common mode suppression for current transients, and demodulate the modulated signal to retrieve the binary data signal by using the first comparator circuit to detect the absence of a first signal state of the modulated signal, using the second comparator circuit to detect the absence of a second signal state of the modulated signal, and determine the absence of a carrier signal in the modulated signal in response to the absence of both the first signal state and the second signal state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method, for communication, comprising:
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receiving a modulated signal from a differential pair of capacitive-coupled signal lines; using a first comparator, determining whether a first state of the modulated signal is present; using a second comparator, determining whether a second state of the modulated signal is present; in response to either an output of the first comparator or an output of the second comparator indicating that the first or second states of the modulated signal is present, setting a demodulated signal to a first value; and in response to the output of the first comparator and output of the second comparator indicating that neither of the first or second states of the modulated signal is present, setting the demodulated signal to a second value. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus comprising:
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a transmitter circuit configured and arranged to encode a binary data value according to a first communication protocol to produce a modulated signal; and a receiver circuit configured and arranged to receive the modulated signal from the transmitter and demodulate the modulated signal to retrieve the binary data signal, the receiver circuit including; a first comparator circuit configured and arranged to detect the absence of a first signal state of the modulated signal, a second comparator circuit configured and arranged to detect the absence of a second signal state of the modulated signal, and a detection circuit configured and arranged to demodulate the modulated signal, based on an output of the first comparator and an output of the second comparator, and to output the binary data signal. - View Dependent Claims (21)
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Specification