隨著科技不斷的進步，造就了生醫植入式裝置誕生，對人類醫學帶來了重大改變。傳統植入式裝置是以電池供電，因為植入在體內，電池壽命到了就必須動手術更換，增加許多術後風險，所以將植入式裝置結合無線能量傳輸方式提供電源，一般無線能量傳輸方式線圈之間距離是固定，但當線圈距離過遠或過近，接收端的線圈會產生過小或過大的能量使得後方電路無法正常操作，所以需要一個能將不同大小的輸入電壓轉換為一個穩定輸出電壓的電路。
本論文採用直流-直流升降壓轉換器，來將不同的輸入電壓轉換為後方電路所需要的電壓1V，透過PWM控制方式即時調節各個開關開啟時間，使電路操作在正確的模式來達到穩壓效果。此晶片使用UMC 0.18um 混合訊號製程，總面積為2.97 × 1.53mm2。在輸入電壓為0.7~1.8V，頻率800k的情況下產生1V的直流電壓以及20mA最大輸出電流。

The continuing advancement of electronic technologies gives rise to a variety of implantable medical devices, which has become a great advance for medicine. In tradition, an implant device is powered by a battery. When the battery is running out of energy, it must be replaced by surgery, which increases many risks. Integrating wireless power transfer system with an implantable device not only avoids battery replacement but also becomes easy to use. However, most wireless power design presumes the separation between inductively - coupled coils is constant. If the separation distance increases or decreases, the received power voltage change accordingly. This change could easily causes system failure. Therefore, this thesis aims to design a DC-DC Buck-Boost converter for wireless power transmission. The converter is expected to supply a constant output of 1V, regardless the input voltages ranging from 0.7V-1.8V. The main advantage is that PWM control is able to adjust conduction time of power transistors immediately and automatically. The die area of the chip is 2.97 × 1.53mm2, which is designed and fabricated with UMC 0.18um 1P6M mixed-mode signal process. The input voltage range is between 0.7-1.8V, the switching frequency is 800 kHz, and the maximum output current is 20 mA.

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