Consider the BiCMOS diff-amp in Figure 11.44, biased at \(I_{Q}=0.4 \mathrm{~mA}\). The transistor parameters for \(M_{1}\) and \(M_{2}\) are: \(K_{n}=0.2 \mathrm{~mA} / \mathrm{V}^{2}, V_{T N}=1\) \(\mathrm{V}\), and \(\lambda=0.01 \mathrm{~V}^{-1}\). The parameters for \(Q_{1}\) and \(Q_{2}\) are: \(\beta=120\), \(V_{E B}(\mathrm{on})=0.7 \mathrm{~V}\), and \(V_{A}=80 \mathrm{~V}\).

(a) Determine the differential-mode voltage gain.

(b) If the output resistance of the current source is \(R_{o}=500 \mathrm{k} \Omega\), determine the common-mode voltage gain using a computer simulation analysis.

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V V+ Q1 Q2 M M2 Figure 11.44 Basic BiCMOS differential amplifier