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peranders 22nd May 2002 09:29 AM

The interesting Luxman stage
I got very interested in these japanese design with a special stage which connects the diff input stage with the output. Could anyone explain a little bit more of the benefits of this weird connection?

Translation help here (not very good but you will understand something)

sonnya 22nd May 2002 09:53 AM

uuuhhh!!? You mean the feedback loop ..wierd!


peranders 22nd May 2002 11:02 AM

Not the feedback just the transistor between input stage and the emitter follower.

sonnya 22nd May 2002 11:16 AM

You mean 2sa1360 and 2sc3423?? Folded cascode.


popes 22nd May 2002 11:39 AM

they are folded cascode connection..
i think it is same pass p/n 5376899 (fig.3 = 134,135,136,137)
how do think about it?

peranders 22nd May 2002 02:05 PM

Mr. Nelson, do you read this? Can you explain the folded cascode (if the circuit I have in mind is a folded cascode)?

What are the pros and cons?

You can give a rather technical explaination.

HarryHaller 22nd May 2002 02:29 PM

Folded cascode
Oh great...... The Nelson Pass amplifier designer school. Free tuition! Why don't you look at Mr. Pass's design articles at his websites and do a search on "cascode" on the forum search page. I think it is a little much to ask a question that broad to anyone on a forum.


Peter Daniel 22nd May 2002 02:59 PM

Check A75 article (starting from page 6). Folded cascode explained there.

peranders 22nd May 2002 03:02 PM

HarryHaller, it's costs you nothing to be humble and nice...

Mr Nelson Pass seems to be a decent guy and I imagine he will answer if he feels like it and/or when he got time. I appreciate if any person have something to say in this matter.

I have searched but I haven't got any "meat on my bones" as we say in Sweden, about just this particular circuit.

UrSv 22nd May 2002 03:09 PM

I tend to agree with the noble Mr Haller here.

It is a bit much to ask and the subject has been discussed on the forum as far as I know and is discussed to some detail in the Pass A75 article (part 1). For more information on cascode we could also reference the document already supplied by Mr Pass on cascode amplifier design:


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