The output of an Op-amp adder is to be $V_O = 3V_1 - 2V_2 + 5.5V_3$. If the value of the feedback resistor is $30\text{ k}\Omega$, find the value of $R_1$, $R_2$ and $R_3$.

The output of an Op-amp adder is to be \(VO = 3V₁ – 2nd PUC Electronics

Exercise Problems · Q15

V_O = 3V_1 - 2V_2 + 5.5V_3

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Using the inverting-adder weights, $R_1=10\text{ k}\Omega$ , $R_2=15\text{ k}\Omega$ and $R_3=\tfrac{60}{11}\text{ k}\Omega\approx5.45\text{ k}\Omega$ .

An op-amp adder gives

V_O=-R_f\!\left(\dfrac{V_1}{R_1}+\dfrac{V_2}{R_2}+\dfrac{V_3}{R_3}\right)

To obtain $V_O=3V_1-2V_2+5.5V_3$ , apply $-V_1$ , $V_2$ , $-V_3$ at the inputs so that the adder's own inversion produces the required signs; the coefficient of each term is then $R_f/R_n$ . Equating coefficients with $R_f=30\text{ k}\Omega$ : …

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Q.The output of an Op-amp adder is to be $V_O = 3V_1 - 2V_2 + 5.5V_3$ . If the value of the feedback resistor is $30\text{ k}\Omega$ , find the value of $R_1$ , $R_2$ and $R_3$ .

Concept understanding — Op-Amp Summing Amplifier (Inverting Adder)

Q.The output of an Op-amp adder is to be VO=3V1−2V2+5.5V3V_O = 3V_1 - 2V_2 + 5.5V_3VO​=3V1​−2V2​+5.5V3​. If the value of the feedback resistor is 30 kΩ30\text{ k}\Omega30 kΩ, find the value of R1R_1R1​, R2R_2R2​ and R3R_3R3​.

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Q.The output of an Op-amp adder is to be $V_O = 3V_1 - 2V_2 + 5.5V_3$ . If the value of the feedback resistor is $30\text{ k}\Omega$ , find the value of $R_1$ , $R_2$ and $R_3$ .

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