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Old 11th September 2012, 03:55 PM   #1041
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Chistophe, the discussion is not about the closed loop gain but about the open loop gain to be raised to get more leeway with feedback to lower distortion.
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Old 11th September 2012, 04:10 PM   #1042
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It ocurred to me that when we "turn around" the lateral Fets ( sources to output ) and ground the output as a transimpedance stage like padamiecki there could be a possibility to set Ugs to the right value and also get more open loop gain.
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Old 11th September 2012, 04:57 PM   #1043
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Quote:
Originally Posted by Joachim Gerhard View Post
Chistophe, the discussion is not about the closed loop gain but about the open loop gain to be raised to get more leeway with feedback to lower distortion.
Please explain, I don't understand. Padamiecki used 3V input.
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Old 11th September 2012, 04:59 PM   #1044
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Quote:
Originally Posted by Joachim Gerhard View Post
Chistophe, the discussion is not about the closed loop gain but about the open loop gain to be raised to get more leeway with feedback to lower distortion.
Ah, thanks, Joachim, sorry for my misunderstanding.
My thoughts:
I suppose the only interest is increasing open loop gain is with keeping the open loop bandwidth equal or better ? Is-it possible ?
As i said in the SSA thread, slew rate is the goal.
... Yes, more feedback gives a better damping factor.
... But, in an other side, it will produce higher signal in the feedback path and that can lead to more TIM ?
I suppose that optimizing this aspect will require a lot of listening test ?
Interesting question to explore.
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Old 11th September 2012, 06:04 PM   #1045
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Quote:
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Please explain, I don't understand. Padamiecki used 3V input.
Just in case anyone is wondering the question:

Quote:
Originally Posted by Joachim Gerhard View Post
padamiecki, did you build that circuit or is it only in simulation ?
It has lower distortion then the TSSA circuits i have seen here.
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Old 11th September 2012, 06:13 PM   #1046
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I am not sure, is that 3V input or output ?
If it is 3V input then his simulation shows much lesser harmonic distortion as other versions of the TSSA i have seen.
Christophe, would more open loop gain result not only in a higher damping factor but also less distortion ?
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Old 11th September 2012, 06:23 PM   #1047
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Originally Posted by Joachim Gerhard View Post
I am not sure, is that 3V input or output ?
If it is 3V input then his simulation shows much lesser harmonic distortion as other versions of the TSSA i have seen.
Christophe, would more open loop gain result not only in a higher damping factor but also less distortion ?
input
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Old 11th September 2012, 06:27 PM   #1048
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input
with 10Vpp @input this topology became behave strange (-4Vdc offset)
but the wise men will do from this joke good follower
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Old 11th September 2012, 06:32 PM   #1049
Jay is offline Jay  Indonesia
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Originally Posted by padamiecki View Post
input
I'm more confused. I thought, of course Joachim knew for sure that it was input. And of course it has lower distortion. But how can I supposed to see it "apple-to-apple" with other TSSA distortions? I mean, there are many ways to make it even lower distortion, especially when it doesn't need to work as a normal amplifier...
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Old 11th September 2012, 06:59 PM   #1050
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I'm more confused. I thought, of course Joachim knew for sure that it was input. And of course it has lower distortion. But how can I supposed to see it "apple-to-apple" with other TSSA distortions? I mean, there are many ways to make it even lower distortion, especially when it doesn't need to work as a normal amplifier...
anyway it is better than this
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