Consider the differential amplifier shown in Figure P11.3 with transistor parameters (beta=150, V_{B E}() on ()=0.7 mathrm{~V}),

Question:

Consider the differential amplifier shown in Figure P11.3 with transistor parameters $\beta=150, V_{B E}($ on $)=0.7 \mathrm{~V}$, and $V_{A}=\infty$.

(a) Design the circuit such that the $Q$-point values are $I_{C 1}=I_{C 2}=100 \mu \mathrm{A}$ and $v_{O 1}=$ $v_{O 2}=1.2 \mathrm{~V}$ for $v_{1}=v_{2}=0$.

(b) Draw the dc load line and plot the $Q$-point for transistor $Q_{2}$.

(c) What are the maximum and minimum values of the common-mode input voltage?

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