Question 18.2: When we need to vary the amplitude of an out-of-phase signal...

When we need to vary the amplitude of an out-of-phase signal, we can use a circuit like the one in Fig. 18-10. If R_1 = 1.2 kΩ and R_2 = 91 kΩ, what are the values of the maximum and minimum voltage gain?

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With the equation given in Fig. 18-10, the maximum voltage gain is:

A_V=\frac{−91 \ k\Omega }{1.2 \ k\Omega } =-75.8

The minimum voltage gain is zero.

18.10

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