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Old 10th January 2018, 08:45 PM   #1521
jackinnj is online now jackinnj  United States
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Mark -- will look at it on the bench this afternoon. Once you start getting into the weedy part of PSRR layout seems to become a critical issue.
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Old 12th January 2018, 04:02 AM   #1522
DualTriode is offline DualTriode  United States
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Mark,

You are speaking of spice results. If the spice results are 20% better than tested results then the spice circuit may have some merit.

While you are at it please run a simulation of the bootstrapped 317 and 337 pre-regulated Jung/Didden regulators.

My suspicion is that the simulation results will be somewhere near the 20% delta compared to the published Jung/Didden regulators results.

DT
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Old 12th January 2018, 04:19 AM   #1523
Mark Johnson is offline Mark Johnson  United States
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Naaw. If it's important, you'll do it yourself. If it's not important, you won't.

If it's too difficult or too time consuming, that means: it's not important. If you can't be bothered to learn how to create and run simulations, that means: it's not important. If you are waaay too "over subscribed", if your normal day requires "multi tasking" far too deeply to even consider creating a simulation, that means: it's not important.

How important is it?
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Old 12th January 2018, 08:11 AM   #1524
DualTriode is offline DualTriode  United States
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Default How important is it? Not so much.

Mark,

Thanks for the clever reply.

I thought that you could be persuaded to help make the point, you are a serious fellow.

Oversubscribed, not so much, I have been selling the peaks.

I am getting the idea that simulation can/does miss a lot. I recently put a new analyzer on the bench and have been testing the homemade creations from over the years.

It is amazing how the transformer/rectifier grunge and IM products get into everything.

If we were to specify minimum regulator performance, I am not sure what high frequency rejection would look like. In terms of the analyzer what weighting curve will we end up using? I am thinking about it.

I have not put LTspice on the new Intel coffee lake computer yet.

What is next; finish the Borbely FET line stage and roll in a few different regulators including the Silent switcher and see what the graphs look like.



DT
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Old 12th January 2018, 04:15 PM   #1525
Mark Johnson is offline Mark Johnson  United States
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Good. Maybe you might want to investigate Omicron's "Bode 100" (web link) test equipment. A couple DIYA members have one, and use it to extract the loop gain and phase plots of real hardware (amplifiers, power supplies, test gear, etc). Occasionally they upload the Bode 100 plots here. Looks like slick gear, and sidesteps many of the doubts & worries about simulations.
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Old 12th January 2018, 04:44 PM   #1526
jan.didden is offline jan.didden  Europe
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I'd rather lose an arm than my Bode 100... ;-)

Jan
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Old 13th January 2018, 01:38 AM   #1527
jackinnj is online now jackinnj  United States
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Quote:
Originally Posted by jan.didden View Post
I'd rather lose an arm than my Bode 100... ;-)

Jan
I found an old omicron application note on how to use it as an S-Parameter analyzer.
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Old 13th January 2018, 08:12 AM   #1528
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by jackinnj View Post
I found an old omicron application note on how to use it as an S-Parameter analyzer.
Isn't that standard? Are you running the latest V3 software?

Jan
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Last edited by jan.didden; 13th January 2018 at 08:17 AM.
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Old 13th January 2018, 12:27 PM   #1529
gerhard is offline gerhard  Germany
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I've bought me a Red Pitaya for XMAS!

14 Bit, 125 MSPS, 2 ADCs, 2 DACs, network, USB, Linux, open source, cheap.

< Red Pitaya >
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Old 13th January 2018, 02:04 PM   #1530
jan.didden is offline jan.didden  Europe
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Gerhard, I have been ogling that also, Elektor had a deal on it recently.

Did you check out the measurement software - is it ready to use?

Jan
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