Question 9.9: Find the output voltage of the three-input summing amplifier...
Find the output voltage of the three-input summing amplifier circuit shown in Fig. 9.27.
Considering the ratios of R_{f} /R for each of the inputs,
V_{o} = – \left\lgroup \frac{R_{f} }{R_{1} } V_{1} + \frac{R_{f} }{R_{2} } V_{2} +\frac{R_{f} }{R_{3} } V_{3} \right\rgroup= – \left\lgroup \frac{1000}{1000} × 1.5+\frac{1000}{1200} × 3 – \frac{1000}{1000} × 4\right\rgroup
= – (1.5 + 2.5 – 8 )
= 4 V.
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