Cascaded-cascode design

ben goh · 10th September 2002, 10:07 AM

Hi all

Can anybody feed me with infor on how a cascaded-cascode

fet design looks like or even provide a schematic for it.

Thank you with regards

Ben.

audioPT · 10th September 2002, 10:11 AM

www.passlabs.com/articles

I think Mr. Pass doesn't mind I'm putting here the link to this great article

Pedro Martins

ben goh · 10th September 2002, 10:33 AM

Hi,

Thank you for the reply.

I have gone thru that and I needed more infor or

schematic if possible.

Thanks

Nelson Pass · 10th September 2002, 09:56 PM

I don't mind at all. Just put FETS where you see bipolars!

till · 10th September 2002, 10:27 PM

I try to learn at the same point at the moment (cascodes) , i bought Horowitz Hill because it was mentioned at much threads in diyaudio by many respektable persons (78 Euro... hard step) and read the little bit they say about cascodes.

I think the prob isn´t to put FETs in instead of the Bipolar Ts, its more difficult to understand the Voltagesources. Maybe its easyer to get it if someone posts a schematic with resisors etc and not only a V in a circle ?

If u are not used to handle this things often, you need a simplified schematic with ccs and vs AND a non simplified to get how it really works after understandig which devices form a cs or vs.

excuse my bad english please. Till.

alaskanaudio · 10th September 2002, 10:49 PM

Till,

Getting the best performance out of a cascade stage can be a little difficult due to the biasing requirements. Most cascaded stages will work when all is properly biased. Just keep in mind that in some configurations the bias sources have to have very low impedances in order for the circuit to perform at optimum levels.

Try this link and see if the info and diagrams there are any help for you.

http://www.deas.harvard.edu/courses/...pdfs/486-a.pdf

And the main page at:

http://www.deas.harvard.edu/courses/es154/

John Fassotte
Alaskan Audio

Bricolo · 16th September 2003, 08:32 PM

Quote:

Originally posted by alaskanaudio
Till,

Getting the best performance out of a cascade stage can be a little difficult due to the biasing requirements. Most cascaded stages will work when all is properly biased. Just keep in mind that in some configurations the bias sources have to have very low impedances in order for the circuit to perform at optimum levels.

Try this link and see if the info and diagrams there are any help for you.

http://www.deas.harvard.edu/courses/...pdfs/486-a.pdf

And the main page at:

http://www.deas.harvard.edu/courses/es154/

John Fassotte
Alaskan Audio

AAAAAAHHH!!!
The site has been updated, and only the lesson 1 is available

10th September 2002, 10:07 AM	#1
ben goh diyAudio Member Join Date: Jun 2001 Location: nil	Cascaded-cascode design Hi all Can anybody feed me with infor on how a cascaded-cascode fet design looks like or even provide a schematic for it. Thank you with regards Ben.

10th September 2002, 10:49 PM	#6
alaskanaudio diyAudio Member Join Date: Sep 2001 Location: Fairbanks, Alaska	Cascade Help Till, Getting the best performance out of a cascade stage can be a little difficult due to the biasing requirements. Most cascaded stages will work when all is properly biased. Just keep in mind that in some configurations the bias sources have to have very low impedances in order for the circuit to perform at optimum levels. Try this link and see if the info and diagrams there are any help for you. http://www.deas.harvard.edu/courses/...pdfs/486-a.pdf And the main page at: http://www.deas.harvard.edu/courses/es154/ John Fassotte Alaskan Audio

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10th September 2002, 10:11 AM	#2
audioPT diyAudio Member Join Date: Aug 2002 Location: Right here	www.passlabs.com/articles I think Mr. Pass doesn't mind I'm putting here the link to this great article Pedro Martins

10th September 2002, 10:33 AM	#3
ben goh diyAudio Member Join Date: Jun 2001 Location: nil	Hi, Thank you for the reply. I have gone thru that and I needed more infor or schematic if possible. Thanks

10th September 2002, 09:56 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	I don't mind at all. Just put FETS where you see bipolars!

10th September 2002, 10:27 PM	#5
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	I try to learn at the same point at the moment (cascodes) , i bought Horowitz Hill because it was mentioned at much threads in diyaudio by many respektable persons (78 Euro... hard step) and read the little bit they say about cascodes. I think the prob isn´t to put FETs in instead of the Bipolar Ts, its more difficult to understand the Voltagesources. Maybe its easyer to get it if someone posts a schematic with resisors etc and not only a V in a circle ? If u are not used to handle this things often, you need a simplified schematic with ccs and vs AND a non simplified to get how it really works after understandig which devices form a cs or vs. excuse my bad english please. Till.

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