Phase synchronization circuit, transmission and reception circuit, and semiconductor integrated circuit
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United States of America Patent
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Sep 12, 2023
Grant Date -
Nov 17, 2022
app pub date -
Jul 29, 2022
filing date -
Feb 20, 2020
priority date (Note) -
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Abstract
A phase synchronization circuit includes: an oscillation circuit that includes a variable current generation unit that generates a variable current of a current amount corresponding to a control voltage and a fixed current generation unit that generates a fixed current of a current amount corresponding to a correction code and generates an output clock signal having a frequency corresponding to the total current amount of the variable current and the fixed current; a feedback circuit that generates a feedback clock signal based on the output clock signal; a control voltage generation circuit that generates the control voltage to make a frequency of the output clock signal become a desired frequency in a normal operation mode; and a correction code generation circuit that generates the correction code in a calibration mode, in which in the calibration mode, the control voltage generation circuit outputs a fixed one of the control voltage.
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