Question

Cout out 02 Cin Rs Q1 R3 R7 Rload Vs Vin sine 1 kHz R4 R5 R6 сь

Answer 1

V_2 /V_1 = -gm V_be (r_0 parallel R_3)/V_1 V_1 = ? Now using voltage Division V_be = r pi/r pi + R_4 V_1 V_1 = r_pi + R_4 /r_pi V_be V_2 /V_1 = -g_m V_be (r_0 parallel R_3)/(r_pi + R_4)/r_pi V_be V_2 /V_1 = -gm r_pi (r_0 parallel R_3)/r_pi + R_4 where r_0 parallel R_3 = r_0 times R_3 /r_0 + R_3 Now in stage 2 (PNP) Ie' = I_b + gm V_eb Ie' = V_eb/r_pi + g_m V_eb I'_e = v_2 /r_0 parallel R_3 V_2 /r_0 parallel R_3 = V_eb [1/r pi + g_m) V_2 = (r_0 parallel R_3) middot V_eb [1/r_pi + g_m) V_out = g_m V_eb times (r_0 parallel R_7 parallel R_L) V_0 /V_2 = G_m V_eb (r_0 parallel R_7 parallel R_L)/(r_0 parallel R_3) V_eb (1/r_n + g_m) V_0 /V_2 = g_m (r_0 parallel R_7 parallel R_L)/(r_0 parallel R_3) [1/r_pi + g_m)/V_0 /v_3 = v_0 /v_2 times v_2 /v_s Now v_2 /v_1 = replace v_1 in term of