C/N ratio detection circuit and signal receiving circuit
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United States of America Patent
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Aug 27, 2019
Grant Date -
Jan 18, 2018
app pub date -
Jan 28, 2016
filing date -
Jan 28, 2015
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Abstract
A C/N ratio detection circuit includes a voltage detector, an averaging section, a time variation range calculator, and a C/N ratio calculator. The voltage detector measures an input voltage of a signal. The averaging section calculates an average of the input voltage over a predetermined time. The time variation range calculator calculates a time variation range of the input voltage over the predetermined time. The C/N ratio calculator calculates a C/N ratio of the signal by using the average and time variation range of the input voltage.
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