Measuring gate threshold voltage

Farzad

Hi all,

I am preparing to set up the gate threshold voltage measurement circuit for the Wolfspeed HF module (CAS120M12BM2). However, I encountered an issue when increasing the gate voltage to reach the threshold voltage level. Once I reached the gate threshold voltage and I stopped increasing, the drain-source current began to decrease gradually (around 1 MicroAmp per 10 seconds). This only happened when using the MOSFET, not the IGBT. I was wondering if anyone could tell me the reason.