本篇論文所研究的的元件為Transient Voltage Suppressor(TVS)，傳統的TVS元件大部分是以單一結構為主要構造，在保護突波上通常只有單層機制，並不能完全符合系統的需求， 所以我們由diode與LDMOSFET結合而成一個新的元件，利用此結構可以達到更好的保護效果。
本篇論文的設計目標是40V的TVS，主要是利用Medici軟體做diode string的電性模擬，H-spice軟體做電路電性分析和利用Cadence軟體做layout的設計，最後並對實際下線元件作量測分析與討論。

The device in this thesis is Transient Voltage Suppressor (TVS). Conventional TVS devices are almost made up by single structure. It just have one protection for suppressing surge and always can not totally conform the requirement of system. Therefore, we create a new device by combining diode and LDMOSFET to improve the characteristics.
The subject for this thesis would be the design of a 40V TVS. We use simulation tools like Medici and H-spice to simulate the electric characteristics of diode string and circuit. We also use Cadence to design layout. Finally, we do measurement and discussion for the final layout device.

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