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KSTR 3rd September 2008 09:06 PM

Amazing opamp measurement shoot-out
You guys should not miss this:

- Klaus

Juergen Knoop 3rd September 2008 09:38 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.

Salas 3rd September 2008 09:50 PM

Excellent. Long time needed.

syn08 3rd September 2008 10:53 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 10:57 PM

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

Wavebourn 4th September 2008 12:07 AM

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

Bonsai 4th September 2008 03:22 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 03:39 PM


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 03:54 PM

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

Have fun, Hannes

lumanauw 4th September 2008 04:39 PM

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

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