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Old 30th May 2009, 11:10 PM   #1
Fanuc is offline Fanuc  United Kingdom
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Default The greatist - AD745 psrr Versus AD797

Howdy,

Something unique about these op amps, the positive rail psrr of the AD745 is simply outragious! (compared with the '797). Obviously loop gain related.

I am getting seriously drunk like the french president! I will back up my arguements later!

Take Care & God Bless

Kevin
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Old 30th May 2009, 11:39 PM   #2
lineup is offline lineup  Sweden
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Hi.

Good report.
I might download AD745 datasheet and have some reading/look at data.

PSRR is not everything, but sure it can be a good sign which is an execellent op.
A good opamp should not have poor PSRR or CMRR.

AD797 is very good and this one I know.
As I have studied the simplified diagram at least.
Scott Wurcer, member here at forum, one of Analog Designs constructors, was invloved in making this great operational amplifier.

I even like it so much I suggested and posted a topic about Buildning one Discrete AD797 clone-like-amplifier:
AD797 Clone people!

Sure, I think Scott will comment on this AD745 vs. AD797, when logs in next time.
He would be a very good judge to compare any differences.


regars, lineup
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Old 31st May 2009, 12:12 AM   #3
Fanuc is offline Fanuc  United Kingdom
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Join Date: Feb 2006
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Quote:
Originally posted by lineup
Hi.

Good report.
I might download AD745 datasheet and have some reading/look at data.

PSRR is not everything, but sure it can be a good sign which is an execellent op.
A good opamp should not have poor PSRR or CMRR.

AD797 is very good and this one I know.
As I have studied the simplified diagram at least.
Scott Wurcer, member here at forum, one of Analog Designs constructors, was invloved in making this great operational amplifier.

I even like it so much I suggested and posted a topic about Buildning one Discrete AD797 clone-like-amplifier:
AD797 Clone people!

Sure, I think Scott will comment on this AD745 vs. AD797, when logs in next time.
He would be a very good judge to compare any differences.


regars, lineup
Thanks for the reply. JCX (john) knows the difference between these op amp designs. Is it something like the 743/745 is the only op amp designed in the 70's that was optimized for low noise.- Nothing since has been optimized this way!!... (history repeating itself and come on the Beatles 'cos I missed them)

Are people feeling me?

Kevin (getting too drunk I best retire for the night!)
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