Circuit for determining whether an actual transmission was received in a low-voltage differential sensing receiver
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United States of America Patent
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Feb 9, 2021
Grant Date -
May 16, 2019
app pub date -
Nov 14, 2017
filing date -
Nov 14, 2017
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Abstract
A circuit has a first window comparator determining whether a signal at a first input has a voltage higher than a first threshold but lower than a second threshold, and a second window comparator determining whether a signal at a second input has a voltage higher than the first threshold but lower than the second threshold. A logic circuit generates pulses in response to either the first window comparator determining that the signal at the first differential input has a voltage higher than the first threshold but lower than the second threshold or the second window comparator determining that the signal at the second input has a voltage higher than the first threshold but lower than the second threshold. A filter circuit receives the pulses from the logic circuit and generates a flag indicating that the signal is invalid, based upon pulses received from the logic circuit.
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