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Exercise Problems · Q6

Q.Calculate the output of the following circuit when V1=25 mVV_1 = 25\text{ mV}.

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Figure — Three cascaded op-amp stages (same circuit as Problem 5). Stage 1 is a non-inverting amplifier: the source \(V_1\) drives the non-inverting — Class 12 Electronics question
FigureThree cascaded op-amp stages (same circuit as Problem 5). Stage 1 is a non-inverting amplifier: the source \(V_1\) drives the non-inverting — Class 12 Electronics question

[!TLDR]

With an overall gain of +60+60, a 25 mV input gives VO=1.5 VV_O=1.5\text{ V}.

The three stage gains multiply together. Stage 1 is non-inverting, A1=1+10k5k=3A_1=1+\tfrac{10\text{k}}{5\text{k}}=3; stage 2 is inverting, A2=−5k5k=−1A_2=-\tfrac{5\text{k}}{5\text{k}}=-1; stage 3 is inverting, A3=−100k5k=−20A_3=-\tfrac{100\text{k}}{5\text{k}}=-20. The overall gain is …

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