ahsoopk
Member level 5
Hi all,
I have read few threads here on the subject but still didn't get the answer that i needed, so starting my own.
Please check out my thinking process and then answer or suggest the solution.
I am designing 20-1000MHz 30W SSPA which should be able to withstand open/short conditions on its output. I thought of protecting the PA using directional coupler and detecting the REV power and switching off the PA, there are two problems that I can see with this approach
1- Detection and switching time will be slow and might not be able to protect the PA
2- There is no guarantee that a open/short at output port will create a maxima at the coupler for it to couple it across
So thirdly I am thinking to use power FET that can deliver 4 times more power than what I require i.e. 120W and use it at 30W so when it sees open/short it will not burn out i.e. voltage maxima will be twice which translated to 4 times the power i.e. 120W.
These are my thought but still cant decide the exact method.
Many thanks in advance for you help.
I have read few threads here on the subject but still didn't get the answer that i needed, so starting my own.
Please check out my thinking process and then answer or suggest the solution.
I am designing 20-1000MHz 30W SSPA which should be able to withstand open/short conditions on its output. I thought of protecting the PA using directional coupler and detecting the REV power and switching off the PA, there are two problems that I can see with this approach
1- Detection and switching time will be slow and might not be able to protect the PA
2- There is no guarantee that a open/short at output port will create a maxima at the coupler for it to couple it across
So thirdly I am thinking to use power FET that can deliver 4 times more power than what I require i.e. 120W and use it at 30W so when it sees open/short it will not burn out i.e. voltage maxima will be twice which translated to 4 times the power i.e. 120W.
These are my thought but still cant decide the exact method.
Many thanks in advance for you help.