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[SOLVED] Thevenin equivalent help

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Smillsey

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Hi all

I am reading up on op amp stabilty and the Ti app note "Stability analysis of Voltage feedback op amps" has a section discussing the pole created by the output impedance and the load capacitance..

I just can't get my head around their thevenin equivalent circuit "looking into the capacitor"

Maybe my brain just isn't working, I don't know.

Can someone run me through this?

See attached...

Thanks!

Millsey.

 

Circuit seeing left from Vout is ZH=Zo//(1/(s*CL)) in Figure.14.
That's all.

ZH=1/(1/Zo+s*CL)=Zo/(1+s*Zo*CL)

VH=ΔVA*(1/(s*CL))/(Zo+1/(s*CL))=ΔVA/(1+s*Zo*CL)
 
Last edited:
In case you forgot, you have to effectively disconnect the circuit from the left of Vout. After that, it is very simple to find the Thevenin generator and impedance.
 
Thanks both

This sorted my mind out, it seems so simple now but had me stumped .
 

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