Demodulation of on-off-key modulated signals in signal isolator systems
First Claim
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1. An on-off key (“
- OOK”
) receiver system, comprising;
a first receiver that generates a first current signal representing a received OOK signal;
a second receiver that generates a second current signal based on a common mode representation of the received OOK signal,wherein the second current signal has a magnitude that is larger than a magnitude of the first current signal when the received OOK signal is inactive; and
a current comparator to generate an output signal representing a comparison of the first and second current signals.
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Abstract
A receiver system for an on-off key (“OOK”) isolator system may include a pair of receivers. A first receiver may generate a first current signal representing a received OOK signal, and a second receiver may generate a second current signal from a common mode representation of the received OOK signal. The receiver system may include circuitry to compare the first and second current signals and generate an output signal therefrom.
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Citations
19 Claims
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1. An on-off key (“
- OOK”
) receiver system, comprising;a first receiver that generates a first current signal representing a received OOK signal; a second receiver that generates a second current signal based on a common mode representation of the received OOK signal, wherein the second current signal has a magnitude that is larger than a magnitude of the first current signal when the received OOK signal is inactive; and a current comparator to generate an output signal representing a comparison of the first and second current signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- OOK”
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11. An on-off key (“
- OOK”
) receiver system, comprising;a first receiver that generates a first current signal representing a received OOK signal; a second receiver that generates a second current signal based on a common mode representation of the received OOK signal; a current comparator to generate an output signal representing a comparison of the first and second current signals; a voltage divider connected across differential inputs to the first receiver; a pair of current routers, each coupled to a common current source, a first current router of the pair of current routers having inputs coupled to the differential inputs to the first receiver, and a second current router of the pair of current routers forming part of the second receiver and having at least one input coupled to an intermediate node of the voltage divider, wherein transistors of the second current router are larger than transistors of the first current router wherein; the current comparator has inputs coupled to the first and second current routers and a node for comparison of currents from each of the first and second current routers; and an output circuit having an input coupled to the node and an output for outputting a binary representation of the output signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
- OOK”
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18. A method of generating a digital voltage signal representing a differential on-off keyed input signal, comprising:
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generating, by an isolator device, a first current signal representing activity of a differential OOK signal receiver; generating a second current signal based on a common mode level of the differential OOK signal, wherein the second current signal has a magnitude that is larger than a magnitude of the first current signal when the differential OOK signal is inactive; comparing the first and second current signals; and generating a binary voltage signal from the current comparison. - View Dependent Claims (19)
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Specification