Modulated cascode and positive feedback?

Circlomanen · 10th March 2006, 08:55 AM

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?

Nelson Pass · 10th March 2006, 06:09 PM

I don't see the nonlinearity of the triode there - just that of
the Mosfet.

Circlomanen · 11th March 2006, 01:42 PM

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???

kekso22 · 12th March 2006, 07:28 PM

Hi Circlomanen,

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

Bye
Emil

Circlomanen · 13th March 2006, 01:14 PM

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.

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???

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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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.

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