For the output stage of Fig. 5.18, assume that V_CC= 15 V and for all devices V_CE(sat)= 0.2 V, V_BE(on)= 0.7 V, and β_F= 50.

Fig. 5.18:

(a) Calculate the maximum positive and negative limits of V_o for R_L = 10 kΩ and R_L = 2 kΩ.

(b) Calculate the maximum average power that can be delivered to R_L before clipping occurs for R_L = 10 kΩ and RL = 2 kΩ. Calculate the corresponding circuit efficiency (for the output devices only) and the average power dissipated per output device. Neglect crossover distortion and assume sinusoidal signals. 

Transcribed Image Text:

+Vcc R4 20 k2 R1 02 Q3 +o V; -Vcc