Depending on Vi, current will flow through the feedback resistor from Vo to always try to maintain the voltage at the inverting input at its status quo.Hi,
Seem to have forgotten how to do this stuff. Trying to find Vo / Vi
Circuit attached as image.
Thanks for any help.
In essence, yes. Effectively the opamp in the opening post will always have the same voltage gain, Vo/Vi. Further to my previous post, the important point to note is that the potential at the inverting input is a virtual earth, not a physical earth. If it were a physical earth, then we would have another violation of KCL because the 10k resistor at the output would be drawing 10mA from earth, and the sum of currents at the earth potentials in the circuit would not be zero.Dave,
No harm, no foul.
I think your analysis would hold up nicely in the case where the opamp in question was a transconductance opamp. In that case the output of the opamp would have been a current source and thus the output impedance would have been set to 10K by the 10K resistor to ground.
Is that true?
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