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OP Amp Output Impedance - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


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

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

Thank

David-S


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Brad
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.


Brad


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

Hi,

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

Regards,
Jean


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Guest
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!





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