Frequency detection circuit
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United States of America Patent
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Aug 15, 2023
Grant Date -
Oct 7, 2021
app pub date -
Jun 18, 2021
filing date -
Jan 22, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
A frequency detection circuit includes: a first signal source for outputting a first clock signal; a second signal source for outputting a second clock signal having the same frequency as but a different phase from those of the first clock signal; a first sample hold circuit for undersampling a reception signal using the first clock signal; a second sample hold circuit for undersampling the reception signal using the second clock signal; and a frequency calculating circuit for calculating the frequency of the reception signal using a phase difference between output signals of the first sample hold circuit and the second sample hold circuit.
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