Hi,
THE FACTS
I have a circuit here in PDF and am trying to figure out why i have a transient at the gate of the second FET(point A on the schematic). The schematic shows the 2 x 10K resistors forming a voltage divider and the signal seen (sawtooth wave) was the outcome. This was not what i was looking for!!!!!!
WHAT I TRIED; EXPERIMENTAION
It was found that when i took off the connection of the 10K from the gate of FET IRFB23N15D to the ground and replaced the other 10K with a 0 ohms resistor there was a presence of trasient underdamped response waveform.
The BMP files attached shows the waveforms.
I know this is characterised my the second order diffential equation in which ther are 2 energy storing elements. I would like to know how i can get a square wave (nice square edges) at the gate of the FET IRFB23N15D at point A on the schematic.
Thanks to anyone who can explain what is goung on. I am speculating that the gate source capacitance and the drain source capacitance is the culprit for the high rise time and the transient.
THE FACTS
I have a circuit here in PDF and am trying to figure out why i have a transient at the gate of the second FET(point A on the schematic). The schematic shows the 2 x 10K resistors forming a voltage divider and the signal seen (sawtooth wave) was the outcome. This was not what i was looking for!!!!!!
WHAT I TRIED; EXPERIMENTAION
It was found that when i took off the connection of the 10K from the gate of FET IRFB23N15D to the ground and replaced the other 10K with a 0 ohms resistor there was a presence of trasient underdamped response waveform.
The BMP files attached shows the waveforms.
I know this is characterised my the second order diffential equation in which ther are 2 energy storing elements. I would like to know how i can get a square wave (nice square edges) at the gate of the FET IRFB23N15D at point A on the schematic.
Thanks to anyone who can explain what is goung on. I am speculating that the gate source capacitance and the drain source capacitance is the culprit for the high rise time and the transient.
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