dac I/V convertion with very low distortion - Page 23 - diyAudio
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Old 17th August 2012, 10:45 PM   #221
smms73 is offline smms73  Portugal
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Quote:
Originally Posted by Joachim Gerhard View Post
Yes, Patrick, on the surface it looks like the Leach but the bias transistors do something different.
I'm afraid it won't work the way you intend. It work with low distortion in my circuit because don't have voltage variations in the input transistors. the cen topology unfortunately have voltage variation in the input transistors.
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Old 17th August 2012, 10:48 PM   #222
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So when i reduce the circuit to the input stgae i nead a plus-minus supply with regulation ?
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Old 17th August 2012, 10:51 PM   #223
EUVL is offline EUVL  Europe
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A cascode would help.

Patrick
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Old 17th August 2012, 10:56 PM   #224
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Quote:
Originally Posted by EUVL View Post
A cascode would help.

Patrick
I think so. but we have to take care of the base currents of the cascade. The final circuit will be more complex that your version of the cen.
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Old 17th August 2012, 10:58 PM   #225
Shinja is offline Shinja  Japan
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Quote:
I think the distortion is caused by Cob and Zout of Q1/Q4/Q13/Q14 ,not base current.
I made a mistake.
not Q1/Q4/Q13/Q14,but Q2 and Q5.
then,the distortion will reduce with bootstraping their collector.
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Old 17th August 2012, 10:58 PM   #226
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At the cost of some complexity it could be a voltgae in - current out mirror but then we come closer to component count of the original design.
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Old 17th August 2012, 10:59 PM   #227
smms73 is offline smms73  Portugal
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Quote:
Originally Posted by Shinja View Post
I think the distortion is caused by Cob and Zout of Q1/Q4/Q13/Q14 ,not base current.
Forgot to say that you right
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Old 17th August 2012, 11:02 PM   #228
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Seems to work fine to me. I simplified a little.
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Old 17th August 2012, 11:07 PM   #229
smms73 is offline smms73  Portugal
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Quote:
Originally Posted by Shinja View Post
I made a mistake.
not Q1/Q4/Q13/Q14,but Q2 and Q5.
then,the distortion will reduce with bootstraping their collector.
Do a simulation. IM with a Android phone only don't have my computer. And post your results .
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Old 17th August 2012, 11:12 PM   #230
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Dirkwright it works but not with the very low distortion that my circuit is capable. Joachim wants to achieve my distortion levels with the simplicity of the
cen topology
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