Title :
An efficiency enhance mixed-structure charge pump
Author :
Hsieh, Zong-Han ; Huang, Nan-Xiong ; Shiau, Miin-Shyue ; Wu, Hong-Chong ; Liu, Don-Gey
Author_Institution :
Grad. Inst. of Electron. Eng., Feng Chia Univ., Taichung, Taiwan
Abstract :
An enhanced high-efficiency switching-capacitor DC-DC voltage converter based on the combination of charge transfer switch (CTS) charge pump and cross-coupled output stage is presented. Some motivated methods to overcome the reverse charge sharing problem of traditional CTS charge pump are discussed and a new mixed structure is proposed to conquer the remaining problem of threshold drop at the output stage. The charge pump proposed can operate at 1 MHz switching-frequency on the 0.1 ¿F pump-capacitors. After the simulation by using HSPICE 0.35 ¿m TSMC process, our work can convert the input low DC-voltage (VDD=1.5V) up near to 5 times of it (VOUT= 7.4483V) and the pump-efficiency reaches to 99.31%. The new proposed charge pump circuit is suitable for low-voltage applications in CMOS process because there is no threshold voltage drop in every stage even at the output stage. A great achievement has been obtained.
Keywords :
CMOS integrated circuits; DC-DC power convertors; SPICE; charge pump circuits; charge-coupled devices; low-power electronics; DC-DC voltage converter; HSPICE; TSMC; charge transfer switch; frequency 1 MHz; mixed-structure charge pump; pump efficiency; switching-capacitor; Capacitance; Capacitors; Charge pumps; Circuits; DC-DC power converters; Feedback; Switches; Switching converters; Threshold voltage; Voltage-controlled oscillators; charge pump; dc-dc converter; high-efficiency; low-voltage; threshold voltage drop;
Conference_Titel :
Integrated Circuits, ISIC '09. Proceedings of the 2009 12th International Symposium on
Conference_Location :
Singapore
Print_ISBN :
978-9-8108-2468-6
