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Old 18th January 2001, 04:15 PM   #1
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The inverted folded cascode amp is a basic part from the new patent from Nelson Pass used in the new X series. Itīs the super symmetry circuit. I have read all the patent and it looks very very interesting. Does anyone know how to make a real circuit from it? I am still trying to work it out. Any ideas would be a big help.
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Old 19th January 2001, 07:13 AM   #2
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Implementation of super symmetry is obvious in SOZ and Balanced Line Stage circuits and if you prefer an active current source/active load version, you can check the Aleph P r1.7. However, if you're really concerned with the inverting folded cascode, you may email Mr. Pass directly about its reason. He's very helpful, from my experience. To my understanding, the folded cascode is not a necessary feature of super symmetric circuit, seems like it just perform level shifting and probably help shielding the gain device from Vds variation. Enjoy.
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Old 25th January 2001, 09:32 PM   #3
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Yeah you are right.
At the begining I thought it was important to have folded cascode.
After reading the patent again i realised that you are right the soz and balanced line stage have the super symmetry idea.
I use the balanced line stage a long time now. Since the article was out in audio electronics.
I want to make a new one now and design an amplifier with balanced out too. Something like the x series.
I might post a design I have soon.
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Old 2nd October 2007, 03:44 PM   #4
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Any updates Promitheus.....
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Old 2nd October 2007, 08:36 PM   #5
Gordy is offline Gordy  United Kingdom
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Workhorse, there is quite a lot of information on this subject, but it is spread out in threads all over the Pass forum...
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