After reading the assigned sections 7.4 and 7.5 you should be able to answer to the following questions.

1. What are the differential and common-mode signals?
2. Derive equations 7.4 and 7.5.
3. Describe in words what does the Fig. 7.25 means?
4. How the symmetry of the small-signal equivalent circuit in Fig. 7.33 is used to reduce it to Fig. 7.34 (for the case of a differential input)?
5. Derive equations 7.56 (Rin) and 7.57 (Avd).
6. How the symmetry of the small-signal equivalent circuit in Fig. 7.33 is used to reduce it to Fig. 7.35 (for the case of a common-mode input)?
7. Derive equations 7.65 and 7.66.
8. What is the common-mode rejection ratio (p.448)?
9. What is the difference between single-ended output and balanced output (p.445)?