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Old 3rd September 2008, 08:06 PM   #1
KSTR is offline KSTR  Germany
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Default Amazing opamp measurement shoot-out

You guys should not miss this:

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

- Klaus
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Old 3rd September 2008, 08:38 PM   #2
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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
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Old 3rd September 2008, 08:50 PM   #3
Salas is offline Salas  Greece
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Excellent. Long time needed.
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Old 3rd September 2008, 09:53 PM   #4
syn08 is offline syn08  Canada
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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?".
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Old 3rd September 2008, 09:57 PM   #5
andy_c is offline andy_c  United States
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That is a great article. I think congratulations to Scott are in order.
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Old 3rd September 2008, 11:07 PM   #6
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Unfortunately Samuel did not measure couple of my favorite opamps, though I've asked him...
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Old 4th September 2008, 02:22 PM   #7
Bonsai is offline Bonsai  Taiwan
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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!
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Old 4th September 2008, 02:39 PM   #8
syn08 is offline syn08  Canada
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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...
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Old 4th September 2008, 02:54 PM   #9
h_a is offline h_a  Europe
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Excellent piece for reading - even for non IC-guys!

Have fun, Hannes
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Old 4th September 2008, 03:39 PM   #10
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Why is it needed to use topology that give noise gain 60dB more than signal gain?
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