High-resolution and agile frequency measurement

    公开(公告)号:US11923859B2

    公开(公告)日:2024-03-05

    申请号:US17033122

    申请日:2020-09-25

    CPC classification number: H03L7/085 G04F10/005 H03M1/50

    Abstract: An apparatus for generating a frequency estimate of an output signal includes a reference signal generator configured to generate a reference clock signal. The apparatus includes frequency estimation circuitry configured to generate a cycle count based frequency estimation of the output signal based on the reference clock signal and a clock cycle count of the output signal. The frequency estimation circuitry further generates a fractional frequency estimation of the output signal based on the reference clock signal and a plurality of time-to-digital conversion phase samples of the output signal. The frequency estimation circuitry further generates the frequency estimate of the output signal using the cycle count based frequency estimation within a range and a frequency error determined from the fractional frequency estimation. The plurality of time-to-digital conversion phase samples and the cycle count based frequency estimation use a same number of reference clock cycles of the reference clock signal.

    FREQUENCY ESTIMATION
    4.
    发明申请

    公开(公告)号:US20210116871A1

    公开(公告)日:2021-04-22

    申请号:US16500172

    申请日:2017-06-26

    Abstract: A frequency estimator for estimating a frequency, including a counter configured to count an integer number of full clock cycles during a measurement time window; a Time-to-Digital Converter (TDC) configured to measure a fraction of a clock cycle during the measurement time window; and a processor configured to determine the estimated frequency based on the counted number of full clock cycles and the measured fraction of the clock cycle.

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