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Old 15th April 2010, 12:17 PM   #1
Elvee is offline Elvee  Belgium
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Default The Tringlinator: a MOS-based Tringlotron amplifier

Using MOS devices in a Tringlotron topology brings a number of benefits.

The Tringlinator shows a 250mW example.

It is a two-stage design, using no negative feedback.
Yet, thanks to the oustanding error-correction properties of the Tringlo (TRIplet of N-device Grouped in Line) topology, the THD can be as low as 0.001%. (Note that this is a real error-correction scheme, not some NFB in disguise).
The damping factor is in excess of 10,000.
M1 and M2 have to closely match and must be tightly thermally coupled.

The input section provides the voltage amplification and is a variation on the Xquad theme.
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Last edited by Elvee; 15th April 2010 at 12:19 PM.
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Old 21st April 2010, 12:12 PM   #2
Gordy is offline Gordy  United Kingdom
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I've not had time to study the topology yet, however I see that Tringlotron gets a mention on TubeCad.com this month: Tringlotron

Good luck with it.
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Old 21st April 2010, 12:53 PM   #3
forr is offline forr  France
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Just before reading this thread, I found this one yesterday (it's in french) :

Applications du Tringlotron à des amplificateurs de classe Audiophile - Forum Projets électroniques
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Old 21st April 2010, 05:42 PM   #4
jcx is offline jcx  United States
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after a quick look I would call it "error compensation/cancelation" - for me "error correction" involves a 'measurement" of the error and then involves feedback or Black's output error feedforward

this circuit relies on device matching for the similar Vgs errors to cancel out
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Old 22nd April 2010, 02:50 PM   #5
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by jcx View Post
after a quick look I would call it "error compensation/cancelation" - for me "error correction" involves a 'measurement" of the error and then involves feedback or Black's output error feedforward

this circuit relies on device matching for the similar Vgs errors to cancel out
Compensation, correction, cancellation.... it is debatable.
"Error cancellation" is probably the most accurate.

But one thing is unquestionable: there is no NFB involved.
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Old 22nd April 2010, 03:58 PM   #6
Gordy is offline Gordy  United Kingdom
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Elvee this looks very interesting. I have a question regarding the bias of M2: the rsisitors R5 and R6 seem to only provide bias for M2, so whay are they relatively low values (k Ohm not M Ohm)? Also, I do not understand why R13 and C2 are across R6... what do they do?

(Thank you)
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Old 22nd April 2010, 07:08 PM   #7
jcx is offline jcx  United States
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Quote:
Originally Posted by Elvee View Post
But one thing is unquestionable: there is no NFB involved.
except for the local feedback around every transistor in the cirucit

I like making the "no feedback" crowd have to admit they're splitting hairs by distinguishing between "local" and "global" feedback

then mayabe some will ask how come one type of negative feedback is always "good" and the other "bad" - or if its true at all
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Old 22nd April 2010, 09:28 PM   #8
00940 is offline 00940  Belgium
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Quote:
Originally Posted by forr View Post
Just before reading this thread, I found this one yesterday (it's in french) :

Applications du Tringlotron à des amplificateurs de classe Audiophile - Forum Projets électroniques
Fascinating link.

I quote (and translate) the original post conclusion:

Quote:
The TRiNGLotron (TRIplet of NPNs Grouped in Line) is a topology linked to the Biglotron.
Let us remind you that the founding principle of the Biglotron, a creation of Pr. Jérémie Ménerlache, is to serve absolutely no purpose. This foundation allows the Biglotron to be used for virtually anything, conferring it an amazing potential and justifying its status as secret weapon.
The Tringlotron, invented by Ludwig Von Bürnmoll is based on the same principle as its famous ancestor, but is less pretentious. It is not very useful and is thus susceptible to be used for many things.
This is already not too bad by itself, as we will see later on.
The whole thing was posted on the first of April...
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Last edited by 00940; 22nd April 2010 at 09:30 PM.
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Old 22nd April 2010, 09:38 PM   #9
Jen-B is offline Jen-B  United Kingdom
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Quote:
Originally Posted by 00940 View Post
Fascinating link.

The whole thing was posted on the first of April...
Then someone tell this guy at ElectronicDesign.com, who posted on April 7th !!! :
http://electronicdesign.com/article/ideas-for-design/novel_buffer_topology_cancels_nonlinearities.aspx
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Old 23rd April 2010, 09:23 AM   #10
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by Gordy View Post
Elvee this looks very interesting. I have a question regarding the bias of M2: the rsisitors R5 and R6 seem to only provide bias for M2, so whay are they relatively low values (k Ohm not M Ohm)? Also, I do not understand why R13 and C2 are across R6... what do they do?

(Thank you)
The bias provided by R5 and R6 is fixed; there is no signal superimposed there, and the node is decoupled to the ground by C2.
R13 is a gate stopper and has an unusually low value because even with ten's of ohms, the Cgd of M2 is sufficient to add some ppm's distortion.

Quote:
except for the local feedback around every transistor in the cirucit

I like making the "no feedback" crowd have to admit they're splitting hairs by distinguishing between "local" and "global" feedback

then mayabe some will ask how come one type of negative feedback is always "good" and the other "bad" - or if its true at all
Depends where you draw the line: if you consider a common collector stage has 100% feedback, then there is indeed feedback everywhere.

But from that perspective, how would you create a no-feedback unity-gain follower?

BTW, I personally have nothing against NFB, and this is more an exercise in style than anything else.
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