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Old 21st January 2013, 12:47 PM   #1
Stee is offline Stee  Italy
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Default Twin Output Stage

With unity gain of the CFP
it is easy to double cells without problems
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Old 21st January 2013, 02:47 PM   #2
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Mmm, believe gain<1. They are only emitter followers, and resistor current share. A classical stage.
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Old 21st January 2013, 06:14 PM   #3
Stee is offline Stee  Italy
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What about VAS?
http://www.esafono.it/Tapiro.pdf
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Old 21st January 2013, 06:20 PM   #4
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Quote:
Originally Posted by Stee View Post
Nothing new: an operational amplifier made with discrete material. I believe that there are some elements idle in the power stage, with only one driver, you can handle base current for 2 or 3 final transistors, saving the cost and space in board.
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Old 22nd January 2013, 05:48 AM   #5
Stee is offline Stee  Italy
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They are not only emitter followers - check for Complementary Feedback Pair here


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Old 22nd January 2013, 12:21 PM   #6
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nothing new its done before in the Alchemist forcetti

Double sziklai pairs can be pain in the a** to stabilize and often require huge miller caps to achieve a safety ( marginal )
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Old 22nd January 2013, 01:02 PM   #7
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Eh?
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Old 22nd January 2013, 02:16 PM   #8
wahab is offline wahab  Algeria
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The schematic on the left look like it was extracted from Bob Cordell s book...
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Old 22nd January 2013, 04:38 PM   #9
Stee is offline Stee  Italy
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Default stabilize CFP

Probably the CFP should be tripled or quadrupled

this allows to increase the resistance of pull-up and directly the stability of the single cell

the output resistance of the cell involves a self-adjustment
greater is its slope in the graph of the drift
the greater its effectiveness
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Old 22nd January 2013, 04:54 PM   #10
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NO STEE ...

you are wrong ..it might work in simulation but in real life will have thermal stability issues ,gain from stage to stage issues,will be by far pcb depending and eventually run to oscillation ..Adding miller caps to keep it stable will kill all the sonics
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