| Summary: | 碩士 === 雲林科技大學 === 電子與資訊工程研究所 === 98 === As the CMOS technology advances integrated circuits are becoming smaller and the power supply voltage is becoming lower. However, circuits for system-on-chip still need to be operated with high voltages . Thus CMOS charge pump circuit are becoming more and more important. Thus, design and implementation of a high-performance CMOS charge pump is describled. The charge pump exploits an automatic pumping control scheme to provide small output ripple voltage. The automatic pumping control scheme is composed of two schemes, an automatic pumping current control scheme and an improved automatic pumping frequency control scheme. A Range-programmable Voltage-controlled Oscillator is adopted. Depending on the magnitude of load current , The range-programmable Voltage-controlled Oscillator generates four different frequency band outputs. The output frequency ranges of the VCO ranges from 900kHz to 9MHz. The improved automatic pumping frequency control scheme generates high pumping frequency when the outputs load current is large. The test circuit is designed using a TSMC 0.18um CMOS technology to design, and operates with a 3.3V power supply.
|
|---|
