Rosemary Ainslie Quantum Magazine Circuit COP > 17 Claims

[TinselKoala]

@MarkE:

Here's something I just discovered by accident while making a new video. The Gate Boost circuit has its beneficial effect on the Vcvr waveform, and increases the VBatt and Vcsr spikes.... even when it is _not powered_.

It takes a little more input amplitude from the FG, that's all. No external separate power supply is needed for the Gate Boost circuit!

Apparently the FG is pulling the PNP transistor down enough to provide a lower impedance path to ground for the mosfet Gate charge, so the mosfet is turning off more cleanly even without power to the boost circuit?  Does that sound right?

[MarkE]

@MarkE:

Here's something I just discovered by accident while making a new video. The Gate Boost circuit has its beneficial effect on the Vcvr waveform, and increases the VBatt and Vcsr spikes.... even when it is _not powered_.

It takes a little more input amplitude from the FG, that's all. No external separate power supply is needed for the Gate Boost circuit!

Apparently the FG is pulling the PNP transistor down enough to provide a lower impedance path to ground for the mosfet Gate charge, so the mosfet is turning off more cleanly even without power to the boost circuit?  Does that sound right?

The bias supply is needed for the NPN pull-up transistor.  It has no impact on the PNP pull-down transistor.  That transistor is self-biased by the gate charge.

[TinselKoala]

Still, it's also cleaning up the rise time of the pulse. The resulting Vbatt and Vcsr scope traces look identical to me, whether the Boost circuit is powered or not, the only difference being the output amplitude of the FG required to make the trace is greater when the Boost is not externally powered.  I'll try to demonstrate this in a video later on. 

[TinselKoala]

Here's the "Supplement" video showing the present Plain Q17 physical layout and explaining the connection block wiring and the probe attach points.

http://www.youtube.com/watch?v=nvEPWl-zSc0

[MarkE]

Still, it's also cleaning up the rise time of the pulse. The resulting Vbatt and Vcsr scope traces look identical to me, whether the Boost circuit is powered or not, the only difference being the output amplitude of the FG required to make the trace is greater when the Boost is not externally powered.  I'll try to demonstrate this in a video later on.

You may not see a lot of difference in the fall time using a 10 Ohm load.  If your NPN transistor is working in the boost driver, then the gate waveform get through the threshold region much faster.