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  3. the circuit shown can be used to make the voltage...

Question: the circuit shown can be used to make the voltage...

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The circuit shown can be used to make the voltage v3 be a linear combination of the supply voltages Vi and v2 (i.e. a constant times vi plus a constant times v2). vs is the absolute voltage at the point indicated, but since the resistor R3 is tied to ground vs is also the voltage drop across resistor R3. (a) Determine a formula for va in terms of the supply voltages and the three resistances and verify that it is a linear combination of vı and v2. (b) Determine the conditions on the resistances such that v3 is exactly equal to v1V2 R2 R3

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