Figure P2.70 shows a modified version of the difference
Chapter 2, Problem 2.70(choose chapter or problem)
Figure P2.70 shows a modified version of the difference amplifier. The modified circuit includes a resistor RG, which can be used to vary the gain. Show that the differential voltage gain is given by(Hint: The virtual short circuit at the op-amp input causes the current through the R1 resistors to be
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