Assume that R_S= R_C= 50k „¦ in Problem 3.2, and calculate the optimum I_C. What is the dc voltage drop across R_C? What is the voltage gain?

In problem 3.2

A CE transistor is to be used in the amplifier of Fig. 3.72 with a source resistance R_S and collector resistor R_C. First, find the overall small-signal gain v_o/v_i as a function of R_S, R_C, β₀, V_A, and the collector current I_C. Next, determine the value of dc collector bias current I_C that maximizes the small-signal voltage gain. Explain qualitatively why the gain falls at very high and very low collector currents. Do not neglect r_o in this problem. What is the voltage gain at the optimum I_C? Assume that r_b = 0.

Figure 3.72

Transcribed Image Text:

Vcc RC Vo Rs Vi