14-06-2013, 11:11 AM
Hi Mike,
Earlier, I commented on the shape of the gate waveform and suggested parasitic oscillation. Upon reflection, I suspect that I was wrong about that. I now suspect that the cause of that distorted waveform is that the Zener diodes do not have an h.f. performance that is required in this cct.: the Zeners are causing that distorted gate waveform. So, try this: using two resistors in series, arrange for a bias of about 10 v. at each gate.
Al. / June 14 //
Earlier, I commented on the shape of the gate waveform and suggested parasitic oscillation. Upon reflection, I suspect that I was wrong about that. I now suspect that the cause of that distorted waveform is that the Zener diodes do not have an h.f. performance that is required in this cct.: the Zeners are causing that distorted gate waveform. So, try this: using two resistors in series, arrange for a bias of about 10 v. at each gate.
Al. / June 14 //
