Consider the small-signal equivalent circuit of the differential-pair configuration shown in Figure 11.9. Derive the expressions for the differential and common-mode voltage gains if the output is a two-sided output defined as \(V_{o}=V_{c 2}-V_{c 1}\).

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Rc Vc2 Rc RB RB 8mVx2 + + V x2 Vb2 8mVx1 Vbl ww Ro Figure 11.9 Small-signal equivalent circuit, bipolar differential amplifier