Chapter 4, Problem 18P

In a useful application, the amplifier drives a load. The circuit in Fig. P4.18 models this scenario.

(a) Sketch the gain $V_o/V_s$ for $\text{10 Ω}\le R_L\le \infty .$

(b) Sketch $I_o$ for $\text{10 Ω}\le R_L\le \infty$ if $V_S=\text{0}\text{.1 V}$.

(c) Repeat (b) if $V_S=\text{0}\text{.1 V}$.

(d) What is the minimum value of $R_L$ if $\left|I_o\right|$ must be less than 100 mAfor $\left|V_S\right|<\text{0}\text{.5 V?}$

(e) What is the current $I_S$ if $R_L$ is $\text{100 Ω}$? Repeat for $R_L=\text{10 kΩ}\text{.}$