| Summary: | 碩士 === 國立臺灣大學 === 電子工程學研究所 === 107 === This thesis presents a fast-locking delay-locked loop (DLL) based four-phase DC-DC buck converter, which is manipulated by transient-modulated constant on-time control (TMCOT). Besides, a novel inductor current balancing method called pulse-width-shrunk technique (PWST) is proposed and it is capable of simultaneously calibrating the duty cycle and the phase error of pulse-width modulation (PWM) signals in the DLL-based multi-phase converter.
For the sake of much faster load transient response, the DLL adopts a modified dual edge triggered phase detector (DET-PD), namely automatic switching single/dual edge triggered phase detector (ASS/DET-PD), to accomplish the fast-locking mechanism.
The buck converter is operated at 10 MHz switching frequency, and it employs a 330 nH inductor and a 22 μF output capacitor. The input voltage is 3.3V, and the output voltage is 1.8V. The load current ranges from 0.4A to 1.4A. The fully-integrated circuit is implemented in TSMC 0.18-μm CMOS process and the chip area is 6.17mm^2.
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