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Old 1st July 2009, 08:40 PM   #1
mlloyd1 is offline mlloyd1  United States
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Default low distortion measurements and forcing opamps to class a

i haven't seen this link posted or discussed and thought it might be of a little interest.

New Technique Accurately Measures Low-Frequency Distortion To <-130 dBc Levels

although the distortion measurement stuff is interesting enough, the real reason i posted the link is the discussion and test results (later in the paper) on forcing an op amp output stage higher into class a.

well, have it ...

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Old 2nd July 2009, 10:36 PM   #2
mlloyd1 is offline mlloyd1  United States
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Default wow ...

i guess either everybody's still reading or "measurements" is a bad word ...

and i meant to say "have at it" in my previous message.

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Old 2nd July 2009, 10:45 PM   #3
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It was a good link and a very interesting document, sorry to see that nobody responded to your post, to be honest I didnít respond because I was sure that a lot of others would do that.
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Old 3rd July 2009, 12:05 AM   #4
KSTR is offline KSTR  Germany
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I think the conclusion is a rather bad one:

All manufacturers should provide this data (the optimum class-A current) already in their datasheets for opamps, if an improvement is found. Or somebody with precision measurement capabilities should volunteer to test many typical audio opamps this way and publish the results. A general overview using the same test setup throughout would be really nice to have.

At least now we know a good value for the OPA690. Won't help JC for the AD797, though.

- Klaus
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