The circuit of Fig. 5.10 has V_CC= 15 V, R_L= 2 kΩ, V_BE(on)= 0.6 V, and V_CE(sat)= 0.2 V.

(a) Sketch the transfer characteristic from V_i to V_o assuming that the transistors turn on abruptly for V_be = V_BE(on).

(b) Sketch the output voltage waveform and the collector current waveform in each device for a sinusoidal input voltage of amplitude 1 V, 10 V, 20 V.

(c) Check (a) and (b) using SPICE with I_S = 10^ˆ’16 A, β_F = 100, r_b = 100 Ω, and r_c = 20 Ω for each device. Use SPICE to determine second and third harmonic distortion in V_o for the conditions in (b).

Figure 5.10:

Transcribed Image Text:

+Vcc Q1 +o Vị RL Q2 -Vcc