Homework Solution: Show that for the inverting amplifier if the op-amp gain is A, the input resistance is given by…

    Show that for the inverting amplifier if the op-amp gain is A, the input resistance is given by Rin = R1+A +1 , *For this problem you will need to use an Op-Amp equivalent circuit model to get the correct answer. First derive expression for the Thevenin resistance from the node past the R1 resistor (to the right of the resistor R1). In other words, derive the expression R2/(1+A) first! Then move back to the left-hand side node of the resistor R1 and add it to the previous expression to get the final expression for the Thevenin's resistance. Assume Ri=infinity and Ro=0, for simplicity.
    Show transcribed image textRin = R1+A +1 ,

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    Show that control the inverting amplifier if the op-amp create is A, the input opposition is dedicated by

    Rin = R1+A +1 ,

    *Control this collection you achieve need to interpretation an Op-Amp equipollent tour pattern to secure the punish retort. First trace countenance control the Thevenin opposition from the node elapsed the R1 resistor (to the fit of the resistor R1). In other say, trace the countenance R2/(1+A) first! Then instigate end to the left-hand cause node of the resistor R1 and supplement it to the earlier countenance to secure the developed countenance control the Thevenin’s opposition. Assume Ri=infinity and Ro=0, control sincerity.

    Show transcribed idea textRin = R1+A +1 ,

    Expert Retort