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Old 16th May 2011, 06:10 PM   #101
john curl is offline john curl  United States
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No, at least how I would define it.
"Condemnation without Examination is Prejudice"
Old 16th May 2011, 07:05 PM   #102
simon7000 is offline simon7000  United States
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Originally Posted by anatech View Post
Hi Simon,
Low dropout values normally indicate a shunt regulator. A series low dropout regulator uses the emitter of the pass transistor as the power input. A classic series regulator circuit will have a higher drop out voltage (2 ~ 3 volts for 78xx and 79xx types) because they output the controlled voltage from their emitter. That costs one base emitter drop right off the bat, and probably two since they normally employ a darlington with speedup resistor as a minimal pass circuit. A CCS to feed the pass element bases carries higher performance and also a higher minimum input - output differential voltage penalty. That's why low dropout regulators normally have reduced noise rejection specifications than series pass types do.

Forget about the Vicor product for the moment. I'll agree they were optimized to reduce switch-mode power supply noise - specialized. Not too surprising coming from a company that builds ... switch-mode power supplies!

Looking at the first links I provided, if you read right through, they explain the basic idea and some other ways to implement the design.

Right now we are quibbling about details instead of agreeing on the fact that Bybee's power supply cleanup products here will work as advertised. So just what is it that we have a differing opinion on anyway?

Chris you understand the difference between series regulators and the Vicor reads as the emitter in version. A shunt will work on just the ripple voltage which is even lower.

What the divergence could be is that Bybee may actually have something new!

As to shunts so far the revival of them has been very interesting. When I wrote my AX tutorial I could not mention the active device works best as a follower as that was proprietary information at that time. Borbely quickly followed up with his offerings and the revival of true shunt regulators took off. Virtually all of the follow ons did not pick up that gain in the actual shunt element slowed things down. The earliest guy to get it right was Salas and his variations seem to be the most copied. Of course one guy who did not understand the difference between a filter and a regulator got upset thinking he had some new contribution.
Old 17th May 2011, 05:13 PM   #103
tvi is offline tvi  Australia
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US7443229 Active filtering

QPO Output Filters

The QPO-1 uses active filtering to achieve greater than 30 dB attenuation of periodic and random deviation (PARD) over the frequency range of 1 kHz to 500 kHz.

Picor Corporation = Vicor

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Old 17th May 2011, 05:34 PM   #104
simon7000 is offline simon7000  United States
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Interesting, so it is a series regulator but using a current monitor. Again something that I think is original. A similarity to the Bybee is that it filters the input voltage for a reference (however it refers to an active filter), but the difference is that it does this after taking the lowest level of the input ripple.

Last edited by simon7000; 17th May 2011 at 05:37 PM.
Old 18th May 2011, 12:01 PM   #105
jackinnj is offline jackinnj  United States
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Originally Posted by simon7000 View Post
Interesting, so it is a series regulator but using a current monitor.
Would you characterize the Linear Tech LT3080 as a series regulator with a current monitor?
Old 18th May 2011, 03:51 PM   #106
simon7000 is offline simon7000  United States
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Originally Posted by jackinnj View Post
Would you characterize the Linear Tech LT3080 as a series regulator with a current monitor?
My quick look at the data sheet only shows it as a series regulator, the current limit is probably thermal. A bit different than the Vicor which filters the minimum input voltage and reproduces that to the output unless it sees a funny current issue. The Vicor is not a voltage regulator! It is a filter so the output device does have very much voltage across it under most conditions. The LT3080 is a regulator so the heat it produces will vary with input and the set output voltage.

The bybee is also a filter not a regulator.
Old 18th May 2011, 09:33 PM   #107
anatech is offline anatech  Canada
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Hi Ed, John,
I understand these are filters and not regulators. I think there is some confusion here, or danger of. This thread doesn't need that kind of thing, so I'll drop out now.

For my end, I have a very good understanding as to what they do. I am sure they work fine. We'll leave it at that. Any further speculation on their technical construction is purely guesswork for all of us. I don't think that debating any of that will help anyone.

So, we agree they work. Cool?

I also understand that you are pointing out that these Bybee and other devices/circuits are approaching a problem from novel directions. That's fair, and I don't think that there is any shortage of really interesting ways that problems can be solved. The most elegant in my book use the natural characteristics of a device or circuit to enhance the job at hand. The end result looks very simple on paper or board layout, but the work is highly refined. Complicated stuff is sometimes very rough and not what you could call optimized.

Hi Jack,
Nifty part. You could also use a low noise shunt regulator to attain even lower noise output instead of that resistor that is suggested. For sure it is a regulator, but the way it's configured should be capable of lower noise than the standard low dropout regulators normally seen on the market.

I might have to get me a few to examine as a low noise oscillator supply reg. Cool.

"Just because you can, doesn't mean you should" my Wife
Old 18th May 2011, 10:37 PM   #108
Heddy Brauch is offline Heddy Brauch
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Thumbs up Music Rails Cost

These devices do not cost $1000 as someone mentioned. They are around $50 to $70 and sold through distributors. Manufacturer is Bybee Labs, Inc. different than Bybee Technologies although their web site says that Bybee is a co-founder. A lot of technical information is available at the web site, so a lot of these questions can be answered.
Old 19th May 2011, 01:49 AM   #109
scott wurcer is online now scott wurcer  United States
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Heddy any relation to Burson Fouch?
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
Old 22nd May 2011, 03:18 PM   #110
Heddy Brauch is offline Heddy Brauch
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Sorry Scott. Not related.

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