Circuit to correct duty cycle and phase error of a differential signal with low added noise
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United States of America Patent
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Jun 6, 2023
Grant Date -
May 4, 2023
app pub date -
Nov 1, 2021
filing date -
Nov 1, 2021
priority date (Note) -
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Abstract
A duty cycle correction (DCC) circuit for use in relation to differential signal communications, a method of providing duty cycle correction, and communications systems and methods employing same, are disclosed herein. In one example embodiment, the circuit includes a differential signal inverter circuit including first and second inverter circuits, each of which has a respective inverter and respective first and second transistor devices respectively coupled between the respective inverter and first and second voltages, respectively. The circuit also includes a feedback circuit coupled to respective output ports of the respective first and second inverter circuits and also to respective feedback input ports of the respective transistor devices. The feedback circuit operates to provide one or more feedback signals causing one or more of the transistor devices to perform current limiting. Respective duty cycles of output signals respectively are equal or substantially equal based on the current limiting.
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