Modulated cascode and positive feedback?
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 10th March 2006, 08:55 AM #1 Circlomanen   diyAudio Member   Join Date: Sep 2004 Location: Göteborg Modulated cascode and positive feedback? I have been thinking a lot about modulated cascode, and I wonder if you can simulate a triode curve by modulating a normal fet or bipolare cascode with some positive feedback??? Something like this? __________________ We live in a horizontal world, why use vertical topologies???
 10th March 2006, 06:09 PM #2 Nelson Pass   The one and only     Join Date: Mar 2001 I don't see the nonlinearity of the triode there - just that of the Mosfet.
Circlomanen
diyAudio Member

Join Date: Sep 2004
Location: Göteborg
Quote:
 I don't see the nonlinearity of the triode there - just that of the Mosfet
My thinking was that modulating the cascode with positive feedback would create an exponential curve..
I was just wondering how to create a triod like curve but without J-fets or triods. Can it be done???
__________________
We live in a horizontal world, why use vertical topologies???

kekso22
diyAudio Member

Join Date: Feb 2005
Location: Bavaria
Hi Circlomanen,

if you want to play try this idea. It makes nices Triode curves.

Bye
Emil
Attached Images
 mfet.jpg (95.1 KB, 236 views)

 13th March 2006, 01:14 PM #5 Circlomanen   diyAudio Member   Join Date: Sep 2004 Location: Göteborg Thank you!! Thats nice with Lovoltechs, but I would like to find a way to create triode like transfercurves with only HexFets. (IRFPXXX) I dont know if that is doable at all but at least its a nice problem to work on. Johannes. __________________ We live in a horizontal world, why use vertical topologies???

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