Testing the TK Tar Baby

[picowatt]

PW,

Regarding the older replication, I think this says it all:

.99,

I believe gmeast recently discussed some power measurements using the Vdrop across the CSR and and another using the Vdrop across Rload.

I was just curious as to what those components were, and what his layout looked like relative to the higher frequencies he mentioned (i.e., short lead lengths, etc. or another "clip lead" set-up).

PW

[TinselKoala]

He's using a circuit, a clock, a load, and operating parameters that are nothing like the "experiment" he claims to be "replicating".... the Quantum article refers.

The only similarity is that it is an N-channel mosfet switching a high-side load.... and that he is making the same measurement errors, although not the same circuit errors, that she did lo those many years ago.

C O C K - a - Doodle - Doo.

[picowatt]

In response to her latest "corrected" statement:

Indeed, the effects of capacitive reactance, as they pertain to AC current flow thru a MOSFET's intrinsic capacitances, are less significant at lower frequencies than at higher frequencies.

The observed 1-2 amps at 2.5MHz in the NERD waveforms can pass thru the MOSFET capacitances irregardless of the MOSFET's on or off state.

At a lower frequency of 1KHz, much less AC current can flow thru the MOSFET capacitances, as their reactance is 2500 times higher at 1KHz than at 2.5MHz (hence, 2500 times less AC current can flow via these capacitive paths at 1KHz than at 2.5MHz).

One cannot, however, use the fact that little AC current can flow thru the MOSFET capacitances at LOW frequencies as an argument that somehow proves that AC current cannot pass thru the MOSFET capacitances at HIGH frequencies.

To do so is to ignore the effects of capacitive reactance all together.


At lower frequencies, as DC conditions are approached, very little current flow thru the MOSFET capacitances will be observed.  This is why it was important to understand the circuit's DC conditions, where capacitance and inductance have little or no effect, before moving on to understanding the more complex AC conditions, where capacitance and inductance play a major role.

[picowatt]

And by the way, correcting her math:

The reactance of 2800pF at 1.3MHz= 43.72 ohms (correct!)

The reactance of 2800pF at 1.3KHz= 43,723 ohms (that's forty three thousand seven hundred twenty three ohms, not 437.182 ohms as she states)

As for the rest of her "arguments" and "logic" based on her very limited understanding of electronics, she is simply wrong.

She should quit arguing and attempt to learn...


   

[TinselKoala]

What is most astounding to me is that she makes these egregious and elementary errors, draws mistaken conclusions based on the errors, rants and insults people based on her mistaken conclusions, then when the errors are unequivocally exposed and corrected for her.... she doesn't change her mistaken conclusions or apologise for her insults and rants. And she still clings to conclusions drawn from erroneous calculations even unto this day.