The Early voltage of transistors \(Q_{1}\) and \(Q_{2}\) in the circuit in Figure P11.24 is \(V_{A}=\infty\). Assuming an ideal current source \(I_{Q}\), derive the expression for the differential-mode gain \(A_{d}=v_{o} / v_{d}\).

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RC -01/0 K RL Figure P11.24