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Old 6th April 2013, 04:58 PM   #1
Stee is offline Stee  Italy
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Default simple diamond mirror preamplifier

many type of configurations at last drive to best solution
simple and accurate
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Last edited by Stee; 6th April 2013 at 05:51 PM.
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Old 6th April 2013, 05:52 PM   #2
Stee is offline Stee  Italy
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Default then the power

stage
with his local total feedback
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Last edited by Stee; 6th April 2013 at 06:15 PM.
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Old 6th April 2013, 07:53 PM   #3
Stee is offline Stee  Italy
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Default STEP THREE

SIZING COMPONENTS and adding bias control

Please change the design as you feel
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Old 6th April 2013, 08:47 PM   #4
RNMarsh is online now RNMarsh  United States
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Looks interesting... going to check out your best audio idea- PULLEYAMP2.

Did you build and test it -- measured or SIM??

Thx-RNMarsh
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Old 7th April 2013, 01:15 AM   #5
Stee is offline Stee  Italy
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never test
also i'm not handy with the simulator
eye should work
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Old 7th April 2013, 12:47 PM   #6
Stee is offline Stee  Italy
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Default one more feedback

it's possible with single pair of power devices
as we know the CFP is subject to self-oscillations
need a gain control
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Last edited by Stee; 7th April 2013 at 12:50 PM.
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Old 10th April 2013, 02:38 PM   #7
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Quote:
Originally Posted by Stee View Post
many type of configurations at last drive to best solution
simple and accurate
It's not unconditionally stable. It needs some serious frequency compensation in order to be unity gain stable. I'm not even sure it's possible to compensate it completely.
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Old 10th April 2013, 02:54 PM   #8
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It's not unconditionally stable. It needs some serious frequency compensation in order to be unity gain stable. I'm not even sure it's possible to compensate it completely.
With some further work it could be. What Stee is showing here is a very poor simplified copy of Analog Devices "QuadCore" topology as used in opamps like AD8047. Probably still under patent protection.

Where did you go dig this up, Stee ??
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Old 10th April 2013, 03:42 PM   #9
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Originally Posted by manso View Post
With some further work it could be. What Stee is showing here is a very poor simplified copy of Analog Devices "QuadCore" topology as used in opamps like AD8047. Probably still under patent protection.

Where did you go dig this up, Stee ??
Well, I'm not interested in stealing patented technology, but if not, then please go ahead and make it stable if you're interested. I already went to the trouble of modeling it and showed that as it is, it's unstable.
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Old 10th April 2013, 04:02 PM   #10
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I have experimented and tested a amp with this type of topology for my employer some 2 years back, it is capable of amazing performance, the problem being dc performance and stability. It is much better suited for IC manufacturing because many of the parts need to be matched.

Like I said Stee s schematic is very simplified, It wont work at all.
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