Inverting Op-Amp Circuits Learning Goal: To analyze op-amp circuits that invert

Question

Inverting Op-Amp Circuits Learning Goal: To analyze op-amp circuits that invert the voltage applied to the negative op-amp terminal. Before proceeding, review inverting op-amp circuits and the ideal op-amp assumptions. Part A - Calculating the output voltage of an inverting op -amp circuit For the circuit shown (Figure 1) , determine Vo when R1 = 7.8k omega , R2 = 8.0k omega , Vx = 400 mu V , and Vcc = 5.0V . Express your answer to three significant figures with appropriate units. Part B - Design of an inverting op -amp circuit For the circuit shown (Figure 1) , determine R2 such that Vo = ? m * Vx. Assume that m = 61, R1 = 6.2k omega , Vcc = 10V and that the op - amp is in its linear region of operation. Express your answer In kiloohms to four significant figures.

Explanation / Answer

Current = Vx/R1

=>V0=-(Vx/R1)*R2

V0=-Vx*R2/R1

Part A:

V0=-Vx*R2/R1=-400uV *8/7.8=-410.25 uV

Part B:

V0=-Vx*R2/R1

m=R2/R1=61

R2=m*R1=378.2 kohm

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