Question

Electronics1. It's a multiple choices question. use the formula sheet if needed (the last picture).

Question 9 CIRCUIT X/FIG.9 (5 Marks) Statement: Consider the RC-coupled amplifier circuit illustrated in Fig. 9 (CIRCUIT X). Sketching relevant output (V-I) characteristics that decide Q-point coordinates and DC load-line details of the NPN-BJT/Si circuit of Fig. 9 of Circuit x) Further, establish an appropriate AC-load line and decide the maximum swing of the output voltage across Road with respect to the Q-point. Assume the input signal at the base is a sine function with o = 21 x frequency (f) and, the circuit details as follows: Vce = 18 volt; V== 1.2 volt; R = 2.0 k; Rs = 2 k; Av] = 120; V1 = 0.026 volt; 131 = Current through Rg taken as 10% of the collector current; Frequency bandwidth (BW) response: 100 Hz to 10000 Hz; B = 120; and, S=10 +Voc Rai RC 181 RS HE Cai HE Сс 1 + 1 v. s VE Red v.(t) Raz 182 RE Fig. 9: CIRCUIT X

Answer 1

Sol: given data, +Vcc = 18 DC - analysis Vcc = 180 Rc Ve=1.2v IC RL = 2ku R = 2ka 18 (Avl = 120 I Br LOVE -0.026V Roy RE S =10 Ibi = 0.llc VE = TERE = (121) IBRE V B = VE +0.7 = 1.2+0.7 VB = 1.90 S = It RB RE V CC-VB IB, ID : 1 + RBI RB 0.11c = 18-1.9 RB 29 RB, RE Tc RB, - 161 Particular I In this not given problem Q-point is slove using options. we

Take option 3 is 5 wrong Ic = 101 (B2120) IB Take option is wrong Ic IB c lll 18 = 120] Take Option s. is wrong Ic IB = 12 (B1120] Take option close the answer. ze u is NE=1.2 t TERE = 1.20 IBRE = 9.92X103 Take option (4) is obec IBRE = 20.7 MAX 479 -9.92 mA RB - 8.33 (Option y vca = 18 - IRC 18 = 18-62.02X4-15) 18 & 9.617 Loption a) So option (4) is correct.