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This paper presents a PWPLL (Pulse-Width Controlled PLL) using a variable-length ring oscillator for autonomously tracking PVT (Process, Voltage and Temperature) variations. We fix the ring oscillator control code and the numbers of the reference CLKs and the feedback CLKs are compared, and then the additional Tracking Circuits switch the number of stages for a PWPLL to be locked. The PWPLL using...