Consider a BJT diff-amp with the configuration in Figure P11.26. The signal sources have nonzero source resistances as shown. The transistor parameters are: \(\beta=150, V_{B E}\) (on) \(=0.7 \mathrm{~V}\), and \(V_{A}=\infty\). The range of the common-mode input voltage is to be \(-3 \leq v_{C M} \leq 3 \mathrm{~V}\) and the CMRR is to be \(75 \mathrm{~dB}\).

(a) Design the diff-amp to produce the maximum possible differential-mode voltage gain.

(b) Design the current source to produce the desired bias current and CMRR.

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V+=+10 V RC www RR = 1 k2 www +1 1/1 RC Q 22 RB = 1 k2 +4=0.2 mA 112 Figure P11.26 V=-10 V