| The purpose of this thesis is to develop a complete Digital Pulse Width Modulator (DPWM) solution for high-frequency dc-dc Switch-Mode Power Supply (SMPS) that is well-suited for integration in power management systems of portable devices. The DPWM is required to have low-power and low-area consumption, whilst having high resolution and high switching frequency operation. The proposed architecture consists of a DPWM based on a segmented ring-oscillator structure to time-quantize the resolution steps. It also includes a digitally programmable switching frequency capability, in addition to having the option of matching the switching frequency to that of an external clock reference. The proposed architecture has been implemented on a standard TSMC 0.18 mum CMOS process and has been verified through simulation and experiments. The mostly digital content of this design has made this design very portable, and so it has been prototyped on an FPGA system. |
