Abstract
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.