Hello,
We've designed an power amplifier test board by using AFM907N LDMOS. We've carefully designed the PCB as all components and traces are showed in datasheet & evaluation board files (Gerber etc). The test board is manufactured and soldered in professional company. But when we test the board as datasheet recommends (Firstly apply gate voltage, then apply drain voltage by increasing slowly, after that apply RF Input signal), the AFM907N seems to being short-circuited. We've reviewed soldering and design essentials for every components (Including connectors, capacitors, ferrite bead etc) in the test board, but there was no problem. The transistor seems to be short circuited when the drain voltage is applied. Is there any problem regarding to this LDMOS product? It seems like the transistor is damaged unexpectedly when the drain voltage is applied. Of course we did not exceed recommended voltage levels as indicated in datasheet. I can share all schematics and gerber files of our test board.
Looking for help about this serious problem!
Best regards.
