BAI TAP DUNG CU LINH KIEN DIEN TU

BỘ GIAO THÔNG VẬN TẢI
TRƯỜNG ĐẠI HỌC GIAO THÔNG VẬN TẢI
THÀNH PHỐ HỒ CHÍ MINH

Bài Tập Dụng cụ
linh kiện điện tử
Nội dung:
1.
2.
3.
4.

Bài tập Diode.
Bài tập BJT, transistor.
Bài tập Opamp.
Bài tập phân tích mạch.

Vi (V)
20
t (s)
0

1

2

3

4

-20

Tài liệu lưu hành nội bộ 2016


Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

BÀI TẬP DIODE
1. Cho sơ đồ mạch và tín hiệu ngõ vào Vi như hình vẽ. (Xem diode là lý tưởng). Vẽ
dạng tín hiệu ngõ ra Vo ?
R

Vi (V)
7

D

t
0

Vo

Vi
V = 5V

-7

............................................................................................................................

Vi (V)
7

............................................................................................................................
............................................................................................................................

t
0
-7

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2. Cho mạch và dạng tín hiệu ngõ vào Vi như hình vẽ. Vẽ dạng tín hiệu ngõ ra Vo ?
(Xem Diode là lí tưởng).
Vi (V)

V = 5V
D

8
t
0

Vi

R

Vo

-8

............................................................................................................................

Vi (V)

............................................................................................................................

8
t
0
-8

............................................................................................................................
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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

3. Cho sơ đồ mạch và tín hiệu ngõ vào Vi như hình vẽ. (Xem diode là lý tưởng). Vẽ
dạng tín hiệu ngõ ra Vo ?
Vi (V)

R

7

D

t
0

Vo

Vi
V = 5V

-7

............................................................................................................................

Vi (V)

............................................................................................................................

7

............................................................................................................................

t
0

............................................................................................................................
............................................................................................................................

-7

............................................................................................................................
............................................................................................................................

4. Vẽ dạng sóng ra?
r

Vi (V)

+

+

20

D(ideal)

t (s)

Vi

0

E
-

-

1

2

3

4

-20

............................................................................................................................
............................................................................................................................

Vi (V)
20

............................................................................................................................

t (s)

............................................................................................................................
............................................................................................................................
............................................................................................................................

0

1

2

3

4

-20

............................................................................................................................
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5. Vẽ dạng sóng ra
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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng
Vi (V)

D(ideal)
+

20

+

t (s)

r
Vi

V0

0

E
-

1

3

2

4

-20

-

............................................................................................................................
............................................................................................................................
............................................................................................................................

Vi (V)
20
t (s)

............................................................................................................................
............................................................................................................................
............................................................................................................................

0

1

3

2

4

-20

6. Cho sơ đồ mạch và tín hiệu ngõ vào Vi như hình vẽ. Tính và vẽ dạng tín hiệu ngõ
ra Vo?
Vi (V)

+

+

Vim

T(ms)

Vi

D (ideal)

V0

0

t1

t2

t1

t2

-Vim

............................................................................................................................
Vi (V)

............................................................................................................................
Vim

............................................................................................................................
T(ms)

............................................................................................................................

0

............................................................................................................................

-Vim

............................................................................................................................

7. Cho sơ đồ mạch và tín hiệu ngõ vào Vi như hình vẽ. Tính và vẽ dạng tín hiệu ngõ
ra Vo?
Vi (V)

Vim

+
Vi

+
D (ideal)

V0

T(ms)
0

t1

t2

-Vim

-

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Trang 3


Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

............................................................................................................................
Vi (V)

............................................................................................................................
Vim

............................................................................................................................
T(ms)

............................................................................................................................

0

............................................................................................................................

-Vim

t1

t2

............................................................................................................................

8. Cho sơ đồ mạch và tín hiệu ngõ vào Vi như hình vẽ. Tính và vẽ dạng tín hiệu ngõ
ra Vo?
Vi (V)

C

2

0,5
Vi

t (s)

R=1
D

V0

1

E

0

2

6

4

8

-0,5
............................................................................................................................

Vi (V)

............................................................................................................................

0,5
t (s)

............................................................................................................................
............................................................................................................................

0

2

............................................................................................................................

-0,5

6

4

8

9. Cho sơ đồ mạch và tín hiệu ngõ vào Vi như hình vẽ. Tính và vẽ dạng tín hiệu ngõ
Vi (V)
ra Vo?
C

V0

D

2

t (s)

R

1

Vi

0,5

E

0

2

4

6

8

-0,5

............................................................................................................................

Vi (V)

............................................................................................................................

0,5

............................................................................................................................

t (s)

............................................................................................................................
............................................................................................................................
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Trường Đại học Giao thơng vận tải TP.HCM

0

2

4

6

8

-0,5

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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

10. Cho mạch và dạng tín hiệu ngõ vào Vi như hình vẽ. Vẽ dạng tín hiệu ngõ ra Vo ?
(Xem Diode là lí tưởng).
E

Vi
D

+

Vm
E

+

Vi

R

V0

-

t

-E
-Vm

-

Vi

............................................................................................................................
............................................................................................................................

Vm
E

............................................................................................................................
............................................................................................................................

t

-E

-Vm

............................................................................................................................
............................................................................................................................

11. Vẽ dạng sóng ra, cho diode lý tưởng.

Vi

Vm

t

E
-E
-Vm

Vi

............................................................................................................................
............................................................................................................................
............................................................................................................................

Vm

............................................................................................................................

E

............................................................................................................................

............................................................................................................................

t

-E
-Vm

12. Cho mạch và dạng tín hiệu ngõ vào Vi như hình vẽ. Vẽ dạng tín hiệu ngõ ra Vo?
(Xem Diode là lí tưởng)
Vi

R
+
Vi
-

+
D
E

V0
-

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Vm
E

t

-E
-Vm

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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thông
Vi

............................................................................................................................
............................................................................................................................
............................................................................................................................
............................................................................................................................
............................................................................................................................

Vm
E

t

-E
-Vm

............................................................................................................................

13. Veõ daïng soùng ra, cho Vi nhö hình veõ.
Vi (V)

C

Vim

E

T(ms)

+

+
D (ideal)

Vi
-

V0

0

t1

t2

t1

t2

t1

t2

t1

t2

-Vim

-

............................................................................................................................
Vi (V)

............................................................................................................................
Vim

............................................................................................................................
T(ms)

............................................................................................................................

0

............................................................................................................................

-Vim

............................................................................................................................

14. Veõ daïng soùng ra, cho Vi nhö hình veõ.

Vi (V)

C

Vim

E

T(ms)

+

+
Vi

-

D (ideal)

V0

0

-Vim

-

............................................................................................................................
Vi (V)

............................................................................................................................
Vim

............................................................................................................................
T(ms)

............................................................................................................................

0

............................................................................................................................

-Vim

............................................................................................................................

Trường Đại học Giao thông vận tải TP.HCM

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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

15. Vẽ dạng sóng ra, cho Vi như hình vẽ.
Vi (V)

C
Vim

+

+
D (ideal)

Vi

T(ms)
0

V0

E
-

t1

t2

t1

t2

-Vim

-

............................................................................................................................
Vi (V)

............................................................................................................................
Vim

............................................................................................................................
T(ms)

............................................................................................................................

0

............................................................................................................................

-Vim

............................................................................................................................

16. Vẽ dạng sóng ra, cho Vi như hình vẽ.
+

7

Vi

t

V0
E1

-

Vi (V)

+
D(ideal)

0

E2
-

-7

Với điều kiện: Vim ≥ E1 ≥ E2
............................................................................................................................
............................................................................................................................

Vi (V)
7
t

............................................................................................................................

0

............................................................................................................................
............................................................................................................................

-7

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Trường Đại học Giao thơng vận tải TP.HCM

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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

17. Vẽ dạng sóng ra, cho Vi như hình vẽ.
r

Vi (V)

+

+
D(ideal)

7

Vi
E1

-

0

E2
-

t

-7

Với điều kiện: Vim ≥ E2 ≥ E1
............................................................................................................................
............................................................................................................................

Vi (V)
7

............................................................................................................................

0

............................................................................................................................
............................................................................................................................

t

-7

.........................................................................................................................................................................................................................................

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 Chú ý: Đối với những bài toán có chứa tụ C, thời hằng τ = RC được giả sử chọn đủ
lớn để hiệu điện thế 2 đầu tụ giảm không đáng kể khi tụ phóng điện (trong suốt thời
gian Diode không dẫn điện).

Trường Đại học Giao thơng vận tải TP.HCM

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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

BÀI TẬP TRANSISTOR

Bài 1: Cho mạch như hình vẽ (các tụ C → ∞). VBE = 0.7V
Xác đònh:
a) Xác đònh dòng IB, IC, IE ở chế độ tónh
b) hie.
c) Tổng trở vào, tổng trở ra?
d) AV.
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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

Bài 2: Cho mạch như hình vẽ (các tụ C → ∞). VBE = 0.7V
Xác đònh:
a. Xác đònh các dòng IB, IC, IE ở chế độ làm việc tónh.
b. hie.
c. Zi, Zo.
d. Av.
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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

Bài 3: Cho mạch khuếch đại như hình vẽ.
Transistor có hfe = 80, VBEQ = 0.7V, các tụ C → ∞.
a) Vẽ đặc tuyến làm việc tónh.
b) Xác đònh hie.
c) Xác đònh Zi, Zo.
d) Av, Ai.
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Trường Đại học Giao thơng vận tải TP.HCM

Trang 11

Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 4: Cho maùch ủieọn nhử hỡnh veừ.
Cho VCC = 31V; VBE = 0,7V; = 100;
R2 = R3 = 1M ; R4 = 5,5K ;
R5 = R6 = 5K ; R7 = 1M
a. Xaực ủũnh hie.
b. Xaực ủũnh Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

Bài 5: Cho mạch như hình vẽ (các tụ C → ∞).
VBE = 0.7V
Tính:
a) Vẽ đặc tuyến làm việc tónh.
b) hie.
c) Tổng trở vào, tổng trở ra.
d) Hệ số khuếch đại áp, hệ số khuếch đại dòng.
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Trường Đại học Giao thơng vận tải TP.HCM

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Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

Bài 6: Cho transistor có hfe(β) = 150,
VBE = 0.7V, các tụ C → ∞:
a) Vẽ đặc tuyến làm việc tónh.
b) Xác đònh hie.
c) Tìm Zi, Zo.
d) Ai, Av.
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Trường Đại học Giao thơng vận tải TP.HCM

Trang 14


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 7: Cho maùch ủieọn nhử hỡnh veừ.
Cho VCC = 31V; VBE = 0,7V; = 100;
R2 = R3 = 1M ; R4 = 5,5K ; R5 = R6 = 10K ;
R7 = 1M.
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 15


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 8: Cho maùch ủieọn nhử hỡnh veừ.
V = 0.7V; = 100.
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 16


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 9: Cho maùch ủieọn nhử hỡnh veừ. V = 0.7V.
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 17


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 10: Cho maùch ủieọn nhử hỡnh veừ. V = 0.7V.
a. Xaực ủũnh hie.

b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 18


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 11: Cho maùch ủieọn nhử hỡnh veừ. V = 0.7V.
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 19


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 12: Cho maùch ủieọn nhử hỡnh veừ. V = 0.7V, = 100.
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.

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Trng i hc Giao thụng vn ti TP.HCM

Trang 20


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 13: Cho maùch ủieọn nhử hỡnh veừ. V = 0.7V, = 100.
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 21


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 14: Cho maùch ủieọn nhử hỡnh veừ.
V = 0.7V
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 22


Bi tp Dng c linh kin in t

Khoa in in t vin thụng

Baứi 15: Cho maùch ủieọn nhử hỡnh veừ.
Bit V = 0,7V.
a. Xaực ủũnh hie.
b. Zi, Z0.
c. Xaực ủũnh Av, Ai.
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Trng i hc Giao thụng vn ti TP.HCM

Trang 23


Bài tập Dụng cụ linh kiện điện tử

Khoa Điện – Điện tử viễn thơng

BÀI TẬP CHƯƠNG 6: OPAMP
Bài 1: Cho mạch như hình vẽ. Tìm điện áp ngõ ra Vo ?

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Trường Đại học Giao thơng vận tải TP.HCM

Trang 24