Calibration circuit and transmitter including the same
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United States of America Patent
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Aug 10, 2021
Grant Date -
N/A
app pub date -
Feb 3, 2021
filing date -
Jul 24, 2020
priority date (Note) -
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Abstract
A calibration circuit includes an oscillator configured to generate an oscillation signal according to a control voltage; a counter configured to generate a count value according to the oscillation signal; and a control circuit configured to control a pull-up driver and a pull-down driver commonly coupled to an output node according to the count value, wherein the control circuit compares a reference count value of the counter by providing a reference voltage as the control voltage for a unit control period with a count value of the counter by providing an output voltage of the output node as the control voltage for a unit control period, and controls a pull-up control signal that adjusts turn-on impedance of the pull-up driver and a pull-down control signal that adjusts turn-on impedance of the pull-down driver.
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