Hi, guys.
These days I was doing some HEMT chips testing, here is my test condition:
Set drain voltage to 48v const;
Sweep gate voltage from -6v to -1v, 251 steps totally(0.02v a step), sweep speed is 1000Hz.
Source was set to floating.(which was connected to power supply's sense low).
I caught the waveform of the gate voltage, and the gate voltage always ringing around the corner of Vth. Here are waveforms of the gate voltage(I ran loop for the gate voltage).
I have tried several methods to prevent this ringing, including connecting ferrite bead and resistor in the gate and slow the sweep speed, but it seemed that these methods didn’t work.
These days I was doing some HEMT chips testing, here is my test condition:
Set drain voltage to 48v const;
Sweep gate voltage from -6v to -1v, 251 steps totally(0.02v a step), sweep speed is 1000Hz.
Source was set to floating.(which was connected to power supply's sense low).
I caught the waveform of the gate voltage, and the gate voltage always ringing around the corner of Vth. Here are waveforms of the gate voltage(I ran loop for the gate voltage).
I have tried several methods to prevent this ringing, including connecting ferrite bead and resistor in the gate and slow the sweep speed, but it seemed that these methods didn’t work.