The circuit parameters for the diff-amp shown in Figure 11.30 are (V^{+}=3.3 mathrm{~V}, V^{-}=-3.3 mathrm{~V}), and (I_{Q}=0.4

Question:

The circuit parameters for the diff-amp shown in Figure 11.30 are $V^{+}=3.3 \mathrm{~V}, V^{-}=-3.3 \mathrm{~V}$, and $I_{Q}=0.4 \mathrm{~mA}$. The transistor parameters are $\beta=120, V_{A 1}=V_{A 2}=120 \mathrm{~V}, V_{A 3}=V_{A 4}=80 \mathrm{~V}$, and $V_{A 5}=\infty$.

(a) Determine the open-circuit differential-mode voltage gain.

(b) What is the output resistance of the diff-amp?

(c) Find the value of load resistance $R_{L}$ that reduces the differential-mode gain to 75 percent of the open-circuit value.

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