| Summary: | 博士 === 國立交通大學 === 電子工程系 === 90 === The fast growing demand of portable and battery-operated electronic systems has driven the efforts to reduce power consumption or to improve the efficiency of these electronic equipments. Regulators are essential for most electrically powered systems which include the prevalent portable equipments. Regulators are required to reduce the voltage variations of the battery. Besides, regulators are often utilized to provide a lower voltage from a higher input voltage for power reduction. Current trends in portable or battery-powered electronics demand ultra-low-power consumption or high operating efficiency to prolong the service time of these battery-operated equipments. As a result, low drop-out linear voltage regulators are always in high demand. Some conventional LDO regulators, however, are implemented in non-CMOS processes and require large quiescent current for the regulator itself. The efficiency is poor at a low load current. Besides, some regulators need external compensation and define a limited range of output capacitor for its stability. This external compensation is not convenient for the consumer because an unstable condition occurs when an output capacitor is not properly chosen. This research develops techniques that enable practical circuit realizations of the CMOS low drop-out regulators which are highly efficient and stable with any kind of output capacitors. A series of CMOS low drop-out regulators are developed in this research and they feature high current efficiency, high input voltage ripple rejection, and low quiescent current, respectively. These low drop-out regulators find their uses in cellular phones, pagers, camera recorders, laptops… etc.
Keeping pace with the portable electronics, rechargeable batteries are also developed rapidly. One of the popular rechargeable batteries is the Li-ion battery. A Li-ion battery protection IC is also introduced in this research due to the growing family of applications of Li-ion battery. Li-ion battery is popular due to its high energy density, high cell voltage … etc. However, it may be explosive without careful handling. A protection circuit is usually integrated inside the battery pack to prevent danger of explosion. In this research, a CMOS micro-power battery protection integrated circuit is realized and the main features are accuracy and low power consumption. This protection integrated circuit can protect the Li-ion battery from explosion and also prolong the battery operating time.
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