A Charge Pump Architecture with High Power-Efficiency and Low Output Ripple Noise in 0.5 mum CMOS Process Technology (original) (raw)
Modern integrated microsystems have several functional blocks which require different voltages to operate adequately. Charge pump circuits are used to generate different voltage domains for different functional blocks on large integrated microsystems. Charge pump is an inductorless DC-DC converter which generates higher positive voltage or lower negative voltage from the applied reference voltage. The thesis presents a high power-efficiency charge pump architecture with low output ripple noise in AMI 0.5 µm CMOS process technology. The switching action of the proposed charge pump architecture is controlled by a dual phase non-overlapping clock system. In order to achieve high power-efficiency, the power losses due to the leakage currents, the finite switch resistance and the imperfect charge transfer between the capacitors are taken into consideration and are minimized by proper switching of the charge transfer switches. The proposed charge pump can operate over the wide input voltage range varying from 3 V to 7 V with the power conversion efficiency of 90%. The loading current drive capability of the proposed charge pump ranges from 0 to 45 mA. iv ACKNOWLEDGMENT First and frontmost, I would like to thank God almighty for giving me marvelous opportunities I have had in my life. To my family, I am grateful for all that you have done for me throughout the years. To my mother, I am thankful to you for your incessant and unconditional love and sacrifice. I am feeling blessed and esteemed to have mother like you. To my father, I thank you for your encouragement and everything that you have done to help me reach where I am now. To them, I owe all. I have been favorable to have great teachers throughout my life. I would like to take this opportunity to convey my earnest appreciation to my advisor Dr. Robert Bowman for his faith in my abilities and consistent help. Without your encouragement, this work would not have been possible. I wish you success in all your future undertakings. Dr. Moon, you are an excellent teacher with awe-inspiring work ethic. I feel beatified to have been your student. Dr. Hirschman, I am truly grateful to you for solemn feedback, help, and encouragement.
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