op-amp + op-amp buffer combinations

eccdbb · 21st July 2011, 07:22 AM

Assuming the buffer is faster and that this will be used as the power amp for driving speakers,

if you have a op-amp with good THD+N performance and one with bad, in addition to a buffer that has good and one with bad, and you put the buffer inside the feedback loop of the op-amp, what will the THD+N of the combination be like for the different combinations:

good op-amp + good buffer
good op-amp + bad buffer
bad op-amp + good buffer
bad op-amp + bad buffer

Has anyone tried this before?

lineup · 11:34 AM

Quote:

Originally Posted by eccdbb

and you put the buffer inside the feedback loop of the op-amp

The best opamp should be the one outside, the total feedback loop.

See my topic: Hifi Combo with OPA445AP + OPA541AP
OPA445 is +/-45V opamp for hivolt
OPA541 is +/-40V power buffer chip

eccdbb · 22nd July 2011, 04:13 AM

Hi lineup, posted in your thread.

Which parameters will be closer to the op-amp on the outside, and which will be closer to the buffer? (I only know the buffer increases Io).

21st July 2011, 07:22 AM	#1
eccdbb diyAudio Member Join Date: May 2011	op-amp + op-amp buffer combinations Assuming the buffer is faster and that this will be used as the power amp for driving speakers, if you have a op-amp with good THD+N performance and one with bad, in addition to a buffer that has good and one with bad, and you put the buffer inside the feedback loop of the op-amp, what will the THD+N of the combination be like for the different combinations: good op-amp + good buffer good op-amp + bad buffer bad op-amp + good buffer bad op-amp + bad buffer Has anyone tried this before?

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22nd July 2011, 04:13 AM	#3
eccdbb diyAudio Member Join Date: May 2011	Hi lineup, posted in your thread. Which parameters will be closer to the op-amp on the outside, and which will be closer to the buffer? (I only know the buffer increases Io).

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