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Old 22nd May 2002, 03:12 PM   #11
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Unhappy I tend to agree with the noble Mr Haller here

Uh oh..... you're in trouble now!

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Old 22nd May 2002, 03:25 PM   #12
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I think you missundertand me. I totally aware of the cascode circuit but what are the A1360 and A3423 in the schematics really? The japanese guy has no email address at his home page so it's hard to get in contact with him.
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Old 22nd May 2002, 03:49 PM   #13
UrSv is offline UrSv  Sweden
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Off topic:

I am in trouble due to the fact that I was agreeing with Mr Haller (which I suppose COULD get me in to all sorts of trouble) or was it Per-Anders being referred to...

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Old 22nd May 2002, 04:03 PM   #14
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I have redrawn the schematic to see better. It seems to be a modified folded cascode circuit. I haven't figured out the difference (in performance) between a

regular diff stage + folded cascode

versus

diff stage + a regular high gain stage with regular cascode. like my overkill phone amp (see my homepage)

Have you checked the advanced cross connected emitter follower?
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Old 22nd May 2002, 04:04 PM   #15
sonnya is offline sonnya  Denmark
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I could be wrong ... as i have not analyzed the circuit (no no, no sims!) yet but you move you dominant pole away from the input stage (the currentmirrors) onto the collector of 2SA1360 and the 2SC3423.
You also get a higher gain this way because of the currentmirror. The currentmirror works as a active currentsource driving the cascode pair...
This way you use both legs of the input diff pairs. This will also double your slewrate in the circuit.

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Old 22nd May 2002, 04:07 PM   #16
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Default You mean 2sa1360 and 2sc3423?? Folded cascode

This folded cascode is sitting on top of the cascodes (C1815 and A1015) for the jfet diff amps. I could explain the circuit but it would cost too much time and effort and people will complain about me anyway... I'm I the only one who thinks there are way too many parts in this thing?

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Old 22nd May 2002, 04:11 PM   #17
sonnya is offline sonnya  Denmark
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no!
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Old 22nd May 2002, 04:13 PM   #18
sonnya is offline sonnya  Denmark
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Its a bit like ML23.5 design .. Thats some complex babes, But with unregulated PSU.

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Old 22nd May 2002, 04:14 PM   #19
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Default uuuhhh!!? You mean the feedback loop ..wierd!

The feedback loop is the coolest thing about this amp. You can use a small film cap and still use low value feeback resistors so as not to run into input capacitance problems with the diff pair feedback input. I have used this several times and I love it.

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Old 22nd May 2002, 04:23 PM   #20
sonnya is offline sonnya  Denmark
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okay now i think i have got the idear of the feedback network... You do not need to use large value caps to block for DC gain.

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