AUTOMATIC FREQUENCY CALIBRATION AND LOCK DETECTION CIRCUIT AND PHASE LOCKED LOOP INCLUDING THE SAME
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United States of America Patent
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Issued Date -
Jun 16, 2022
app pub date -
Nov 29, 2021
filing date -
Nov 29, 2021
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Abstract
An automatic frequency calibration and lock detection circuit includes a frequency error generator circuit, an automatic frequency calibration signal generator circuit, and a lock flag generator circuit. The frequency error generator circuit generates a frequency error signal based on a reference frequency signal and an output frequency signal. The frequency error signal represents a difference between a frequency of the output frequency signal and a target frequency. The automatic frequency calibration signal generator circuit generates an automatic frequency calibration output signal and an automatic frequency calibration done signal based on the frequency error signal and a first clock signal. The lock flag generator circuit generates a lock done signal based on the frequency error signal, the automatic frequency calibration done signal and a second clock signal. The frequency error generator circuit is shared by the automatic frequency calibration signal generator circuit and the lock flag generator circuit.
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