For the output stage of Fig 5 20a, assume that V CC 15 V, Icirc sup2 F (pnp) 50, Icirc sup2 F (npn) 200, and for all devices V BE(on) 0 7 V, V CE(sat) 0 2 V, I S 10 14 A Assume that the magnitude of the collector current in Q 13A is 0 2 mA (a) Calculate the maximum positive and negative limits of V...

a R L 10 K V o V CC V CE17 sat V be23 V be20 15 02 ...

For the output stage of Fig. 5.20a, assume that V CC = 15 V, Î² F (pnp)

Question:

For the output stage of Fig. 5.20a, assume that V_CC= 15 V, Î²_F(pnp) = 50, Î²_F(npn) = 200, and for all devices V_BE(on)= 0.7 V, V_CE(sat)= 0.2 V, I_S= 10^ˆ’14A. Assume that the magnitude of the collector current in Q_13Ais 0.2 mA.

(a) Calculate the maximum positive and negative limits of V_o for R_L = 10 kÎ©, R_L = 1 kÎ©, and R_L = 200 Î©.

(b) Calculate the maximum average power that can be delivered to R_L = 1 kÎ© before clipping occurs, and the corresponding circuit efficiency (for the output devices only). Also calculate the peak instantaneous power dissipation in each output device. Assume sinusoidal signals.

Fig. 5.20 a:

+V cc |0.17 mA Q138 Q134 BIAS 0.22 mA Q14 Q19 0.68 mA| Q18 7, V2 Q20 V1 Q23 Q17 +o -V cc (a)