Analog Electronics with LabVIEW®

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8.5. Differential Voltage Gain

Suppose that an input voltage, V_g12 = V_g1 – V_g2, is applied between the inputs. Due to symmetry, the voltage magnitudes at the inputs with respect to ground are V_g1 = V_g12/2 and V_g2 = –V_g12/2, respectively. The noninverting output, V_d2, for this case is, by superposition,

Equation 8.21

The gains for the contributions from V_g1 and V_g2 are (8.19) and (8.20), respectively. This is the case of a pure differential input with resulting gain

Equation 8.22

A similar approach applied to obtain the gain for the output ...

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