-Frequency Response-BJT Amplifier with Rt:
Let's analyze Example 9.11 with ro = 40 kΩ. What is the effect on A_mid and f_Ls, the resulting cutoff frequency? Consider the network shown in Fig: 9.80.
- Determine r_e.
- Find A_vmid.
- Calculate V_i.
- Determine Z.
- Determine f_zs.
- Determine f_Lc and f_LE.
- Determine the low cutoff frequency.
- Sketch the asymptotes of the Bode plot defined by the cutoff frequencies of part.
- Sketch the low-frequency response for the amplifier using the results of part (e).
14 V
C_wi = 5 pF
C_bc = 12 pF
C_wo = 8 pF
C_be = 40 pF
C_ce = 8 pF
R_t = 5.6 kΩ
R_e = 0.47 pF
R_c = 68 kΩ
V_o
B = 120
A_f = 0.47 A
R_1 = 3.3 kΩ
R_2 = 10 kΩ
L = 2 kΩ
C = 20 pF
R = 0.47 pF
FIG_ 9.80