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Calculate the output voltage for the given amplifier.

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The negative sum is obtained by setting V3 = 0. As shown in Figure 1,

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VO=RFR1V1RFR1V2 VO=RFR1(V1+V2) Given RF = 100K, R1 = 10K, V1 = 1.5V and V2 = 3V VO=100K10K(1.5+3) VO=45V..........(1)

Now set V1 = V2 = 0V, in order to find output voltage due V3 ,

Since 10K becomes parallel to 10K as V1 and V2 are grounded hence equivalent resistance R becomes as shown in Figure 2,

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R=10K||10K=10KX10K10K+10K=5KΩ......(2) Calculate the output voltage due to V3: V"O=(1+RFR)V3.........(3)

Where V3 is the voltage obtained due to Voltage Divider Rule as shown in Figure 3,

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V3=1.5K10K+1.5KV3=0.130X4=0.52V....(4)

Substituting equation (2) and equation (4) in equation (3), V"O=(1+100K5K)X0.52=10.92V V"O=10.92V.......(5)

Adding equation (1) and (5) to obtain total output voltage VO, V0=V0+V"0 V0=45+10.92 VO=34.08V

The output voltage of amplifier is VO = -34.08V

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