blob: b49db335a6c175a8bf75333838e287138dfb9df2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
//chapter12
//example12.9
//page245
V_CC=12 // V
gain_beta1=100
gain_beta2=50
V_BE=0.3 // V
V_CE=8 // V
I_C=1 // mA
// here V_CC=V_CE+I_C*R_C so we get
R_C=(V_CC-V_CE)/I_C
I_B=I_C/gain_beta1
// we know that R_B=(V_CC-V_BE-gain_beta1*R_C*I_B)/I_B so
R_B=(V_CC-V_BE-gain_beta1*R_C*I_B)/I_B
// for gain_beta=50 i.e. gain_beta2
// we know that R_B=(V_CC-V_BE-gain_beta2*R_C*I_B)/I_B so we get
I_B2=(V_CC-V_BE)/(R_B+gain_beta2*R_C)
I_C2=gain_beta2*I_B2
V_CE2=V_CC-I_C2*R_C
printf("for beta=100,required base resistance = %.3f kilo ohm \n",R_B)
printf("for beta=50,new operating point is %.3f V, %.3f mA \n",V_CE2,I_C2)
|
