| Summary: | 碩士 === 國立臺北科技大學 === 電子工程系碩士班（碩士在職專班） === 103 === Traditionally, envelope tracking techniques are implemented by low dropout reg-ulator, since the linear regulator has a wide bandwidth and little output ripple but the power efficiency of the linear regulator is very poor when the output voltage level is low. To improve the bandwidth limitation of the switching amplifier and the poor efficiency of the linear amplifier at back-off, a variety of hybrid architectures have been used in this thesis which is parallel combined linear and switching amplifiers. The linear amplifier is implemented by a class-AB for efficiency improvement, additional buck converter, which provides a dynamically varying supply.
Static power supply voltage for power amplifier with a higher peak-to-average power ratio, it caused the efficiency is poor, and power loss caused chipset heated. To suppress the heating that’s necessary to improve the efficiency. This thesis designed the power converters with envelope tracking techniques to improve efficiency and provide power voltage to power amplifiers.
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