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OP Amp output Impedance - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.

Post subject: OP Amp output Impedance
Unread postPosted: Wed Feb 16, 2005 1:58 am

I want to ask if it is correct to measure Op-Amp output impedance by measuring S22 with Network Analyzer




Post subject:
Unread postPosted: Wed Feb 16, 2005 8:38 am

The answer is yes, but just be sure you do not exceed the DC voltage input level to the network analyzer.



Post subject:
Unread postPosted: Tue Apr 05, 2005 1:13 am


I agree with Brad. just wanna add, probably it's safer to use attenuator at the port 2 of network analyzer.



Post subject: Output impedance
Unread postPosted: Fri Apr 08, 2005 12:10 pm

The assumption made in the previous responses is that you want the closed-loop output impedance (of the entire circuit), not the intrinsic output impedance of the operational amplifier (by itself).

Is this a correct assumption?

Good Luck!

Posted  11/12/2012
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