Consider the differential amplifier shown in Figure 9.24(a). Assume that each resistor is \(50(1 \pm x) \mathrm{k} \Omega\).

(a) Determine the worst case common-mode gain \(A_{C M}=v_{O} / v_{C M}\), where \(v_{C M}=v_{1}=v_{2}\).

(b) Evaluate \(A_{C M}\) and CMRR \((\mathrm{dB})\) for \(x=0.01,0.02\), and 0.05.

Figure 9.24(a):-

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R R ww 20 WW R3 RA (a)