. | ||
1. | . | |
2. | . | |
3. | . | |
(, , , ..) , , . .
.
, .
n-p-n, , , .
1 .
:
TB = 0.0455t = 0.0455*1 = 0.0455 .
TB = 0.0455 .
:
t = 2.2TB = 2.2*0.0455 = 0.1 .
:
fB = 2.2/2 π t = 0.35/ t
fB = 0.35/0.1 = 3.5 .
, .
, 10 , , f = 35 .
371, , .
:
U.. =12 .
Pmax =100 ; Imax =20 ; h21 >50.
R=10*R
- U = 0,9
.
1. , , . , 20 ( 0,8) , .
P.max=0,8*Pmax =0,8*100 =80
2. ( ):
I0=P.max/U0=P.max/(U../2) = 80/(12/2) = 13 .
3. , ( ) , :
(R+R)=(U../2)/I0 = (12/2)/13=6/13 = 460 .
470 .
, , R=10*R, :
|
|
R = 430 ; R = 39 .
. 250 , . :
() = 2500/fmin = 2500/250000 = 0,01 = 10 .
4. .
U0=(U0+ I0*R)=(U..- I0*R) = (12 - 0,013 * 470 ) = 5,89 .
5. :
I=I/h21=[U../(R+R)]/h21 = [12 / (430 + 39 )] / 100 = 0, 25 .
6. , R1, R2. ( 5-10 ) I, . 10 :
R1, R2: I.=10*I = 10 * 0,25 = 2.5 .
R1+R2=U../I. = 12 / 0,0025 = 4800 .
7. ( ). : - 3 ! :
U=I0*R = 0,013 * 39 = 0,507 ,
I0 - .
8.
U=U+U =0,507 +0,9 =1,407
, :
R2= (R1+R2)*U/U.. = 4800 * 1,407 / 12 = 562,8
R1= (R1+R2)-R2 = 4800 562,8 = 4237,2 .
, , R1 , : R1 =4,22 ( 48).
9. - ( ) .
- () , . , . . t=R*C, R=R*h21, C - . C , C . ( ) f=1/t.
t=R*C=RC, C - .
t= R*h21*C = 39*100*1*10-9 = 0,000039
f=1/t = 1/0,000039 = 25 640 = ~26 .
250 .
t=R*C=RC = 430*0,8*10-12 = 3.4*10-8
f=1/ t = 1/3,4*10-8 = 0,29*1010 = 290 .
250 290 .
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