Book Description

"Modern integrated microsystems have several functional blocks which require different voltages to operate adequately. Charge pump circuits are used to generate 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 [micron] 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."--Abstract.