Amazing opamp measurement shoot-out

KSTR · 3rd September 2008, 08:06 PM

You guys should not miss this:

http://recforums.prosoundweb.com/index.php/t/24704/0/

- Klaus

Juergen Knoop · 3rd September 2008, 08:38 PM

thank you!

I remember Ben Duncan? or someone else publishing opamp distortion specs in EWW in the 90's .
But not at this detail level.
regards

Salas · 3rd September 2008, 08:50 PM

Excellent. Long time needed.

syn08 · 3rd September 2008, 09:53 PM

Amazing work and results. I hope the author will keep up with more opamps (there are quite some [worth evaluating] devices, in particular from AD and TI).

Nothing really surprising, only the LT1115/LT1128 are dissapointing and somehow conflict with my own measurements (but then I did not evaluate the common mode linearity and the input impedance linearity).

I also hope the discrete opamp manufacturers will send samples for evaluation (to help answer the third question) but somehow I doubt they will...

Anybody asking "but how does it sound?".

andy_c · 3rd September 2008, 09:57 PM

That is a great article. I think congratulations to Scott are in order.

Wavebourn · 3rd September 2008, 11:07 PM

Unfortunately Samuel did not measure couple of my favorite opamps, though I've asked him...

Bonsai · 4th September 2008, 02:22 PM

Great Paper with very interesting commentary.

Interesting how quickly things degrade once you start to drive heavy loads and/or high output levels on most of the devices..

I might be wrong, but it looks like the AD749 comes out tops overall and the LME4xxx from Natsemi a creditable 2nd place.

The author also commented that extra care is needed on the AD device. I think th e NS device is a bit easier to use, so thats what its got in its favour.

As mentioned alreadt, congratulations are in order to Scott Wurcer!

syn08 · 4th September 2008, 02:39 PM

Quote:

Originally posted by Bonsai

I might be wrong, but it looks like the AD749 comes out tops overall and the LME4xxx from Natsemi a creditable 2nd place.

There are a few very strong contenders for the first place that were not yet evaluated:

OPA211, THS4031, OPA827, OPA2822, OPA842 from TI
ADA4899-1, AD823, AD8066, AD8610, AD8599 from Analog Devices
EL2227 from Signetics/Elantec

...and probably more...

h_a · 4th September 2008, 02:54 PM

Excellent piece for reading - even for non IC-guys!

Have fun, Hannes

lumanauw · 4th September 2008, 03:39 PM

Why is it needed to use topology that give noise gain 60dB more than signal gain?

3rd September 2008, 08:06 PM	#1
KSTR diyAudio Member Join Date: Jul 2007 Location: Central Berlin, Germany	Amazing opamp measurement shoot-out You guys should not miss this: http://recforums.prosoundweb.com/index.php/t/24704/0/ - Klaus

3rd September 2008, 11:07 PM	#6
Wavebourn Designer & Technologist diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Unfortunately Samuel did not measure couple of my favorite opamps, though I've asked him... __________________ Wavebourn: We Create Creativity!

4th September 2008, 02:22 PM	#7
Bonsai diyAudio Member Join Date: Aug 2006 Location: Tokyo	Great Paper with very interesting commentary. Interesting how quickly things degrade once you start to drive heavy loads and/or high output levels on most of the devices.. I might be wrong, but it looks like the AD749 comes out tops overall and the LME4xxx from Natsemi a creditable 2nd place. The author also commented that extra care is needed on the AD device. I think th e NS device is a bit easier to use, so thats what its got in its favour. As mentioned alreadt, congratulations are in order to Scott Wurcer! __________________ bonsai http://www.chrismakesmusic.com/

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3rd September 2008, 08:38 PM	#2
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	thank you! I remember Ben Duncan? or someone else publishing opamp distortion specs in EWW in the 90's . But not at this detail level. regards

3rd September 2008, 08:50 PM	#3
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Excellent. Long time needed.

3rd September 2008, 09:53 PM	#4
syn08 Account disabled at member's request Join Date: Aug 2005 Location: Toronto	Amazing work and results. I hope the author will keep up with more opamps (there are quite some [worth evaluating] devices, in particular from AD and TI). Nothing really surprising, only the LT1115/LT1128 are dissapointing and somehow conflict with my own measurements (but then I did not evaluate the common mode linearity and the input impedance linearity). I also hope the discrete opamp manufacturers will send samples for evaluation (to help answer the third question) but somehow I doubt they will... Anybody asking "but how does it sound?".

3rd September 2008, 09:57 PM	#5
andy_c Banned Join Date: Apr 2003	That is a great article. I think congratulations to Scott are in order.

4th September 2008, 02:54 PM	#9
h_a diyAudio Member Join Date: Sep 2006	Excellent piece for reading - even for non IC-guys! Have fun, Hannes

4th September 2008, 03:39 PM	#10
lumanauw diyAudio Moderator Join Date: Oct 2002 Location: Bandung	Why is it needed to use topology that give noise gain 60dB more than signal gain?

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