Small signal Load Impedance Calculation

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bit_an

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Kindly help me with a suggestion. How can I calculate the load impedance given in the picture. I am designing a differential input and single ended output Op-Amp to drive this load. I need to know the load values, but I am not sure about if the capacitors are in series or parallel in the small signal model. I need the small signal model to design a miller compensation inside my Amplifier. So i need to calculate the equivalent load at the output.

 

Z1=50+1/(j*omega*C), C=5pF
Zload=Z1/2=25+1/{j*omega*(2*C)}

100ohm can not been seen from drive point.
 
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    bit_an

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I have an output buffer stage in my Opamp. So the output impedance of my Opamp will be in series with Z1?!
 
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In transient simulation, under step response, what Cap value do I see?
The link is redirecting me to the same page.
 

You should be able to use your thevenin and norton theory in order to figure this one out.

You can also conceptually separate your input into two separate inputs, and take advantage of the fact that there is no current across the 100 ohm resistor because the voltages on either side are identical due to symmetry.
 

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