LOCK DETECTION CIRCUIT AND PHASE-LOCKED LOOP CIRCUIT
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United States of America Patent
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Issued Date -
Jul 8, 2021
app pub date -
Mar 24, 2021
filing date -
Mar 24, 2021
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Abstract
A lock detection circuit is configured to include an integrating circuit that integrates a phase difference between a frequency-divided signal of a VCO and a reference signal during a constant period within a transient response period for an output signal from the VCO, and integrates a phase difference between the frequency-divided signal and the reference signal during a constant period within a convergence period for the output signal from the VCO; and a degree-of-convergence calculating circuit that calculates a degree at which the output signal from the VCO has converged, from a result of the integration of the phase difference obtained by the integrating circuit during the constant period within the transient response period and a result of the integration of the phase difference obtained by the integrating circuit during the constant period within the convergence period.
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