Due Friday 2019-01-25 at the start of class.

Emitter Read [AoE] from section 2.2.3 through the end of section 2.2.6 (page 87).

Read [AoE] section 2.3.7, paying attenting to Figure 2.60. The “(figure out why)” at the end of page 101 is the goal of the Lab 1-B Current Mirror circuit.

## 2. Complete the lab circuits

For each of the Lab 1 versions. It is completely valid to build them also to check your hand work!

• Find the values of the checkboxed items.

• Additional: Sweep source `Vs` and find the operating modes of `Q1` over this range. Write down as a table of `Vs` ranges and the corresponding `Q1` mode.

• Find the values of the checkboxed items.

• Additional: Sweep source `Vs` and find the operating modes of `Q2` over this range. Write down as a table of `Vs` ranges and the corresponding `Q2` mode. (`Q1` is always either in cutoff or at the boundary between active and saturation — "diode-connected")

## 3. AoE - Exercise 2.8 (p. 84)

Design an emitter follower with ±15 V supplies to operate over the audio range (20 Hz to 20 kHz). Use 5 mA quiescent current and capacitive input coupling.

This problem uses results from Lab 1-A Emitter Follower: §2.2 Amplifier. The solution looks suspiciously like AoE Figure 2.25 or 2.27 (there are other reasons for choosing between these two topologies). You want the input series capacitor to have an impedance _much lower that the input impedance of the amplifier ($R_1 || R_2$ or $R_B$) over the specified frequency range. “Much lower than” can be $|Z_C| < \frac{1}{10} R_{in}$ for this exercise.