Rosemary Ainslie Quantum Magazine Circuit COP > 17 Claims

[TinselKoala]

  Koala or Mark,
               what's a CVR?
                      Thanks John..

CVR = current viewing resistor = CSR = current sense resistor, the terms are interchangeable. Ainslie calls this a "shunt" which is also sort of correct, although a real current-viewing shunt is generally a strip or block of metal or even just a short bit of wire with known low resistance.

I usually call it CVR since it allows viewing of the current. It doesn't really "sense" the current in my usual meaning of "sense". It simply produces a voltage drop across it in accordance with Ohm's Law; the oscilloscope "senses" this voltage drop. The scope/resistor system allows one to "View" the current in the circuit. I will generally use "cvr" but sometimes I may use "csr".

[TinselKoala]

I think you may be missing a flyback diode across the load. You'll notice that the ringing doesn't go below zero.

Attached is one schematic of a sim I did long ago. I also attached a sim scope shot showing the ringing with the truncated bottom.

Yes, I don't have a flyback diode installed; I figured since Ainslie hasn't specified the circuit she is using..... I'd just use the original Quantum Magazine arrangement, not the 2009 EIT paper claimed arrangement for the same experiment.

How-ever (tm RA).... My traces are showing the Vbatt and the Vcsr, just as Ainslie shows, and there isn't any excursion below zero in either my Vbatt or Ainslie's, and my below-zero excursions on Vcsr are just the same as Ainslie's. Aren't they?

[poynt99]

Yes, you are right. I didn't notice the tiny "tick" in the screen indicating the 0-ref line.

Rose usually has a large excursion ring-down; large enough that the bottom gets truncated as can be seen in her and my scope shots. You may not get the effect without the flyback diode.

[TinselKoala]

Here's what my Drain and Gate traces look like. Note that the mosfet is really slow to respond at these frequencies. It will be interesting to see if MarkE's gate driver booster will help the mosfet turn on faster.

[Google]

Poor Ainslie must be in real pain. You guys have first ANALYSED her and now ANALISING her.  Have some mercy.