BÀI TẬP MÔN ĐIỆN TỬ THÔNG TIN

1
BÀI TẬP
MÔN ĐIỆN TỬ THÔNG TIN

Câu 1:

0
f

.
a) T:
L
X
,
Q
,
L
V
,
C
V
, BW,
1
f

2
f
. 
1
f


2
f

 - 
)
b)
T
Z

Z


1
f


Câu 2:
 
kHz  kHz.
1)               
Cmax/Cmin)
2) C
H


Câu 3:
:
0
f

,
L
X
Q
, 

tank
Z



Câu 4:
, 
0
f
,
L
X
,
Q
,
C
V

a. C=50pF

2
b. C= 200pF

Câu 5:
1) , 
0
f

L
X
,
C
X
,
L
I
,
C
I
,
Q
, Z
CH

T
I

0
f

2) Trong 
a. 
b. 

3) Trong ,

c.
0
f

d.
L
X
,Q,
tank
Z

e. BW


Câu 6:




.10)(Re,400,100
0
 KqPFCHL


1. 
0
? 


2. 
PFCPF 500300 




C

L

r


3
Câu 7:


1
=100

H; f
0

0



e
=10K



1
?








Câu 8:










Câu 9:




dB.
Câu 10:


V2,V100

.
2. 
Câu 11:


Số thứ tự tầng
Độ khuếch đại
Hệ số nhiễu
1
10
3
2
20
4
3
30
5

Câu 12:
C
2

C
1

L
a
b

Req
Ze
C
2

C
1

L
a
b
Ze
2
Ze
1
L
2

L
1

c
d
L
2
L
3

L
1

C
Ze
2
Ze
1
a
b
c
d
a)

b)


4

0


a. 
b. 
1. 
2.  .
Câu 13:
 
25KHz.

Câu 14:



1. 
2. 
Câu 15:
   


0
C.
Câu 16:

 

Câu 17:


Số thứ tự tầng
Độ khuếch đại (dB)
Hệ số nhiễu (dB)
1
12
2
2
20
5



5
Câu 18:


1) 
2) 
C

EQ7
.
3) 

Câu 19:


1) 
2) 
3) 
4)  
5) 

1

2
.
6) Cho V
cc
= 20V, R
a

v
= R
a
+ R
b

v


7) Cho
tv
ss

sin7,0

dd
khi v
s
= v
s max


dd
khi v
s
= v
s min
.
8) Suy 
minmax dddd
fff 

2
= 8
2
= 4pF.
9) 
s

0

Vc
Vcc
v
s
(t)
C1
R1
L1
L2
C2
C3

C5
V
pc
C
V

L3
R2
T
R
a

R
b

v
0
(t)
Q
C4
R
3
R
1
f
0
D1
Q2
Q3
Q5

R
2
Q6
Q7
Vcc
v
EQ7
D2
I
Q1
C
Q4
v
C
R
4

6

Câu 20:


1) 
2) 
 
3) 
Câu 21:
Cho  (Q=15)

1) 1) 

2) 2) 
3) 3)        





T1




v
s
(t)
T2
T3
R1
C1
R6
C8
C5
5
V
B
R2
C2
C3
L
C

C4
R4
L
K
C
K
C7
R3
R5
C6
V
CC
6v
6.7v
5.3v
1.5pF
2 pF
3 pF
6 pF
Cv
V


C
E
0,001F

R
E


Q1

R
B
2
R
B
1
4:1

R
L
L1

25H

C1

50p
F

v
i
C





V
CC
= 15V

7
Câu 22:


1) 
dd
.
2) 


Câu 23:

1) 1)   



4) 

2

4

.

2


4

= 1F





Câu 24:


1)  
L
2
L
1
N
2

N
1

C

L
K
v
o

L

2
L
1
N
2

N
1

C

L
K
v
o

a) 
b) 
R
G


C
C
0,01F

C
1
100pF

L
2
L
1
N
1

N
2

C
2
100pF

C
D
0,01F

R
D


L=10H



R
L
V
DD

= 15V
MPF102

10pF

C
1
1000pF

Q1

R
2
R
1
L
2
+V
CC

C
2
100pF

L1

1H

C
5

C
4
C
3
v
0

8
2) 

Câu 25:



v

C

C
V
V
C
C
21
0




0



0

2
= 100H.
a) 
C
= 0V).
b) 

Câu 26:
Mt b n s 
N
f
= 1MHz vu b  s
chuyi n s ra
0
f
cn th 1V
Câu 27:
B tng hp trong  to ra 400 tn s u nhau 10kHz, bi
tn s i t 144 MHz. n 148 MHz. Tn s chun  
efr
f
=10kHz, mch ng n s
H
f
 nh nhn nht
ca b m (

N
)


Câu 28:
D liu c, tn s u ra phu N=4609?
K
v
o

C
1
C
2
L
100H

R
1
V
C
C
4
C
v

9


Câu 29:

D kh v,
0
f
b
a.
i
f
=25kHz, N=100
b.
i
f
=100kHz, N=35



Câu 30:
1) v ,
0
f
b
2) Gi s i t 
a.
0min
f

b.
0 axm
f

c.

CH
f
f
CH
a 2 tn s p  n s
u nhau mt khong f
CH







10
Câu 31:
NBW  r s dng cho 
 AM bit rng tn s cao nht ca u ch trong g f
smax
=
5 kHz?
Câu 32:
T ng c  u   ng cn
truyn ti tn s i mi di biu h s u ch ?
Câu 33:
a mng
ca mi di bing cn truyn nu h s u ch m = 0,75
Câu 34:
nh h s u ch n
mi di biu ch bn.

Câu 35:
nh h s u ch cu bit tg
ng mi di bi
Câu 36:
Mh s u ch i t 0,4 n 0,6. Bing ti
tn s ng ti di bi
sau khi h s u ch n 0,6.
Câu 37:
Mu ng ti tn s 
i di bi
Câu 38:
nh h s u ch m cv:



Câu 39:
Mt trc thit k sao cho tn s trung tn
s cn thit ca khi nng nu tn s  
ng hp:
a. Tn s ng nn s n
b. Tn s ng ni thn s n
Câu 40:
Thit k mt mch khuut ch  t ra 12W v
cu sau: tr n 50, tr i 75 hong  tn s 91MHz.

11
Câu 41:
Cho mch khut ch  vnh:
a/ Tn s cng ca mch?
b/ Nn s ci th 

t ngu khui
t.
t ra ln nht (maximum output power).
G
2
_ ax
L
8R
PP
out m
V
P 

e/ Gi s    D   
nh nhi  ln nht (maximum power
dissipation P
D
)
f/  ln nht cng hp xu nht nu
i nhi t .
(G
( 25 )
C
P D T C   
, v- t st gim, D- h s gim,
C
T
- nhit
)

Câu 42:




Câu 43:
Thi 

12



Câu 44:




Câu 45:
         
