| Summary: | 碩士 === 龍華科技大學 === 電子工程研究所 === 97 === In recent years, battery powered electronic devices are in great demand of consumer markets. To work properly, the devices must drain power from battery, which contains only limited energy. As a result, the trend of smart power supply is focused on implementation of power converter with high-efficiency, low-voltage, and low-power consumption.
Three topics are included in this thesis: bandgap reference circuit, operational transresistance amplifier (OTRA) and low dropout regulator (LDO). The bandgap reference circuit will be discussed first. Its output voltage is constant and independent of temperature variation. The proposed OTRA features the advantages of high frequency. The circuit so that its characteristics with fixed bandwidth and has better noise immunity. Finally, the third part of this thesis, aim at the design and implementation of the LDO which is widely used in power electronic systems. The design efforts are focused on reduction the output noise, power consumption, response time and increasing the efficiency of the regulator.
The circuits are designed and fabricated in a TSMC 0.35-µm CMOS process. Maximum efficiency of the converter is 85%. The other related design principles and performance parameter will describe in the next chapter.
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