Programmable Switching Type DC-DC Voltage Down Converter

• Main Authors: Chen, Chin-Lin, 陳契霖
• Other Authors: S.J.Jou
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/13462720562386543462

碩士 === 國立中央大學 === 電機工程學系 === 86 === For application in a low voltage and low power digitalcircuit design, a programmable switching type DC-DCVoltage Down Converter (VDC) circuit is proposed in thisthesis. The analysis of switching type VDC are described and some formulae are derived. Techniques to improve the power efficiency of VDC circuit are introduced and discussed. We develop a new structure of PWM used in the VDC. For our PWM circuit, the frequency and duty cycle of the pulse width modulation wavecan be chosen by 5 control bits. Combining a digitally controlled oscillator based tapped delay line into the PWM, the PWM is more stable and robust delay linewhen process variation occurs. The power efficiency of the VDC when operating in 1MHz can reach 93%. Finally, we layout the programmable switching type VDC circuit by using the TSMC 0.6um 1P3M process technology. The core area is about 650um*350um and can supply current up to 120mA.