In the circuit in Figure P10.11, the transistor parameters are \(\beta=80\) and \(V_{E B}\) (on) \(=0.7 \mathrm{~V}\).

(a) Design the circuit such that \(I_{O}=120 \mu \mathrm{A}\) for \(V_{E C 2}=\) \(0.7 \mathrm{~V}\).

(b) If \(V_{A}=80 \mathrm{~V}\), determine the change in \(I_{O}\) for (i) \(V_{E C 2}=2 \mathrm{~V}\) and (ii) \(V_{E C 2}=4 \mathrm{~V}\).

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IREF www V+= 5 V R Figure P10.11 + Q2 VEC2