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Old 14th August 2011, 05:35 PM   #201
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You're thinking about something like that.
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Last edited by Lazy Cat; 14th August 2011 at 05:41 PM.
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Old 14th August 2011, 05:38 PM   #202
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Lazy Cat View Post
It looks in this concept with 8 transistors, lateral MOSFET output's would give the best THD figures, loading the VAS less than other versions.

MOSFET driver is another option, maybe ...
Laterals would perfectly suit if...they are driven by an EF stage,
as the high frequency THD would rise a lot if there s no bufferisation
of the VAS, even if it has a relatively high standing current.

Also, two pairs would be necessary to have good THD distribution.

That makes a lot in respect of the projected simplicity , but high
perfs are not achievable with low component count , unless
one use a dedicated high perf IC driver.
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Old 14th August 2011, 05:39 PM   #203
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Yes, that looks good to me.
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Old 14th August 2011, 05:43 PM   #204
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I also thought like Wahab that the Szikley is around the output Fets, so one driver stage more. Yes, this gets us more away from the simplicity of the first version.
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Old 14th August 2011, 05:48 PM   #205
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Lazy Cat View Post
You're thinking about something like that.
Somewhat like this..
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File Type: gif LAZYCAT MOD LFET THD1.gif (9.1 KB, 1330 views)
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Old 14th August 2011, 05:55 PM   #206
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Quote:
Originally Posted by Joachim Gerhard View Post
Yes, that looks good to me.
OK, that's good.

I know we could easily go to 20 transistors version in a split second, but that maybe will happen in another thread, another time.

So, we have to stay at most 8 transistors only concept, this ensures discrete symmetrical circuit simplicity, on the other hand on us is to find the best sch configuration within these limits for the best performance. It sounds like a challange to me.

Last edited by Lazy Cat; 14th August 2011 at 06:04 PM.
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Old 14th August 2011, 05:58 PM   #207
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Quote:
Originally Posted by wahab View Post
Somewhat like this..
Nooooo, too many transistors according to thread theme.

Besides this is not somewhat Joachim meant. Check my last sch, DRAIN output ...
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Old 14th August 2011, 06:01 PM   #208
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Lazy Cat View Post
So, to stay at most 8 transistors only concept, this ensures discrete circuit simplicity, on the other hand on us is to find the best sch configuration within these limits for the best performance. It sounds like challange.
Either linearity or OLG or both have to be improved for better perfs,
but in all cases , this is possible only with additionnal components...
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Old 14th August 2011, 06:02 PM   #209
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I would then turn around the Fets ( post 205 ) but that may create oscillation problems.
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Old 14th August 2011, 06:10 PM   #210
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Joachim Gerhard View Post
I would then turn around the Fets ( post 205 ) but that may create oscillation problems.
It is quite possible , stability is not unconditional..
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