P 6.5-9 Determine the voltage for the circuit shown in Figure P 6.5-9

Hint: Use superposition.

Answer: v_o = (– 3)(3) + (4)(– 4) + (4)(8) = 7 V

Figure P 6.5-9

So let’s deactivate the 4 V and the 2 mA sources and find due to the 3 V source. The circuit looks like

Since there can be no currents in the inputs and the non-inverting input is connected to ground . Now find the current i

Solve for

Now deactivate the 3 V and the 2 mA source and we get

Again with no currents allowed in the inputs, we have -4 V at the non-inverting input so Again find the current

Solve for

Finally deactivate the 3 V and the 4 V sources and we have

Again there can be no current in the input, so the voltage at the non-inverting input comes from the voltage across the 4 kΩ resistor which must have 2 mA going through it, so

Now find current

Solve for

Now add the ’s upp

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This page last updated on March 17, 2019