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Determine { v }_{ 0 } in the circuit of Fig. 5.88. 

Step-by-step

The first op amp is an inverter. If  { v }_{ 1 } is the output of the first op amp,

v_{1}=-\frac{200}{100}(0.4)=-0.8\mathrm{V}

The second op amp is a summer

V_{0}=\frac{-40}{10}(0.2)-\frac{40}{20}(0.8)=0.8+1.6=\underline{2.4 \mathrm{V}}

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