Renesas Electronics America Inc.

Dominic WingKin Yip

Dong-Young Chang

Systems and methods for calibrating a clock signal are described. A device can include a processer, a circuit and a system duty cycle control (DCC) circuit. The circuit can perform a first phase shift on a clock signal to generate a first phase-shifted signal. The circuit can perform a second phase shift on the clock signal to generate a second phase-shifted signal. The circuit can perform a fixed DCC on the first phase-shifted signal to generate a first voltage signal. The circuit can sweep the second phase-shifted signal at a range of duty cycles to generate a second voltage signal. The circuit can sample an output clock signal at a time where the first voltage signal and the second voltage signal overlaps. The processor can generate a digital code based on the output clock signal. The system DCC circuit can calibrate the clock signal using the digital code.

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Fremont, CA, United States of America

Dominic WingKin Yip