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Old 5th March 2003, 12:47 AM   #1
martioz is offline martioz  Australia
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Default Multiloop and inverting configuration

Is this a correct implementation of the multi-loop feedback into inverting Op amplifier buffered circuit?
Hence inverting input has lower distortion Iím trying to configure feedback loop and overall gain.

Any comment is more than welcome.
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Old 5th March 2003, 12:49 AM   #2
martioz is offline martioz  Australia
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Default Schematic

Damn, forgot attach,
Edit:
Cannot see attachment
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Old 5th March 2003, 12:51 AM   #3
martioz is offline martioz  Australia
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trying again...
Edit:
can't post attachment

maybe link works:
http://www4.head-fi.org/forums/attac...&postid=312006
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Old 5th March 2003, 07:36 AM   #4
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Your outer loop generates positive feedback !!

Regards

Charles
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Old 5th March 2003, 08:56 AM   #5
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Yeah, two cascaded inverting amps make a non-inverting amp! Add a third stage. Other than that, you want to return R4 to the junction of R2 and R3.
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Old 5th March 2003, 11:24 PM   #6
martioz is offline martioz  Australia
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Thanks for pointing this out; I was half asleep when I post it.

I hope now the circuit is correct, the idea is to use two inverting opamps to get non-inverted signal.
Get inner loops to stabilize opamps and outer loop to adjust required gain.

Link:
http://www4.head-fi.org/forums/attac...&postid=312845


But I think, since this circuit is to be used as a "gain clone", letís say gain about 100, the function of the outer loop losing functionality.
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Old 6th March 2003, 12:15 AM   #7
martioz is offline martioz  Australia
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Corrected Attachment (Link):

http://www4.head-fi.org/forums/attac...&postid=312898
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Old 6th March 2003, 12:48 AM   #8
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*Every* connection to U1 pin 2 needs a resistor in series. The top opamp output hasn't got one in series with it's output to U1 pin 2 like it should.
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Old 6th March 2003, 01:31 AM   #9
martioz is offline martioz  Australia
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Is it better to return signal from the output of the feedback opamp to the point in front of R2 instead of adding extra resistor to the global loop?
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Old 6th March 2003, 02:17 AM   #10
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Default the missing resistor!

No...its not!

It need the resistor!
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