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Output impedance and shorting of input terminal a groove

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venkateshr

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Hello there ,

I am wondering why we are used to shorting the input terminal while finding out the output impedance of any ckt . Based on two port networks Z²² is defined like that ,ok.Then tell me how it yields good results even if we use the same op resistance(for which we shorted ip and found the impedance) while calculating the output of the ckt when the input is there . Can anyone explain ?
 

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