Revisit the exact analysis of the inverting amplifier in Section 4.3.
(a) Find an expression for the voltage gain if Rin ≠ ∞, Rout = 0, and Ao ≠ ∞.
(b) For R2 = 27 kΩ and R1 = 3 kΩ, plot the ratio of the actual gain to the ideal gain for Ao = 1000 and 1 kΩ ≤ Rin ≤ 100 kΩ.
(c) From your plot, does the ratio approach unity as Rin increases or decreases?
(d) From your plot in (b), what is the minimum value of Rin if the gain ratio is to be at least 0.98?
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