Department of Electronic Engineering

Faculty of Engineering and Technology

University of Sindh, Jamshoro
Electronic Devices and Circuits (EE-123)

LAB # 07
Name: ______________________________________________________ Roll No: ________________

Score ________________Signature of the Lab Tutor: ______________________ Date: _____________

Dr. Mudasir Ahmed Memon

Selection of Utilization of Experimental Experimental Lab Safety Teamwork Technical
Equipment Lab Tools & Data Collection Data Analysis Precautions During Lab cleanliness and 𝒔𝒄𝒐𝒓𝒆 = 𝟐
×𝐎𝐛𝐭𝐚𝐢𝐧ed marks
(0 to 5) Calibration (0 to 5) (0 to 5) (0 to 5) Task Organization 𝟑𝟓
(0 to 5) (0 to 5) (0 to 5)

Object: To study the input and output characteristics of a transistor in the Common Emitter (CE)
configuration. Apparatus Required:
1. Regulated Power supply, Breadboard and Connecting wires
2. Transistor (2N3904, 2N3906), Resistors (1KΩ, 100KΩ)
3. Oscilloscope, Function Generator and Multimeter (MM)
Theory: [30 minutes]

The basic circuit diagram for studying input and output characteristics of CE configuration is
shown in Fig 7.1. The input is applied between base and emitter, the output is taken between collector
and emitter. Here emitter of the transistor is common to both input and output and hence the name
Common Emitter Configuration. Input characteristics are obtained between the input current (I B) and
input voltage (VBE) at a constant output voltage (V CE) as shown in Fig. 7.2 (b). Output characteristics are
obtained between the output voltage (VCE) and output current (IC) at constant input current (IB) as shown
in Fig. 7.2 (a).

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 Department of Electronic Engineering
Faculty of Engineering and Technology
University of Sindh, Jamshoro
Electronic Devices and Circuits (EE-123)

Fig. 7.1: Common Emitter Configuration in Multisim

(a) Output characteristics (IC Vs VCE) (b) Input characteristics (I B Vs VBE) Fig.
7.2: Input and output characteristics of CE configuration.

Formulas:

𝐼𝐶 = 𝛽𝐼𝐵
𝑉𝐶𝐸 = 𝑉𝐶𝐶 −𝐼𝐶𝑅𝐶
Procedure: [150 minutes]

Input Characteristics:

1. Connect the circuit as shown in Fig. 7.1.

2. Keep the output voltage VCE = 1V by varying VCC.
3. Vary VBB gradually, note down base current IB and base-emitter voltage VBE in Table 7.1.
4. Repeat the above procedure (step 3) for VCE = 10V and 20V.

Output Characteristics:
1. Connect the circuit as shown in Fig. 7.1.
2. Keep base current IB = 0µA by varying VBB.
3. Vary VCC gradually and note down collector current IC and Collector-Emitter Voltage (VCE) in
Table 7.2.
4. Repeat the above procedure (step 3) for IB = 12µA and 29µA.

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 Department of Electronic Engineering
Faculty of Engineering and Technology
University of Sindh, Jamshoro
Electronic Devices and Circuits (EE-123)

Table 7.1
Input characteristics
VBB (V) IB VBE VBB (V) IB VBE VBB (V) IB VBE
0.1
V CE =1V

0.1 0.1 0.2

V
VCE=20
0.2 0.2 0.3
V
VCE=10

0.3 0.3 0.4

0.4 0.4 0.5
0.5 0.5 0.6
0.6 0.6 0.7
0.7 0.7 0.8
0.8 0.8 0.9
0.9 0.9 1
1 1 1.1
1.1 1.1 1.2
1.2 1.2 1.3
1.3 1.3 1.4
1.4 1.4 1.5
1.5 1.5 1.6
1.6 1.6 1.7
1.7 1.7 1.8
1.8 1.8 1.9
1.9 1.9 2
2 2
Table 7.2
Output characteristics
VCC (V) IC VCE VCC (V) IC VCE VCC (V) IC VCE
I B =0 µA

I B =12 µA

I B =29 µA

1 1 1
2 2 2
3 3 3
4 4 4
5 5 5
6 6 6
7 7 7

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 Department of Electronic Engineering
Faculty of Engineering and Technology
University of Sindh, Jamshoro
Electronic Devices and Circuits (EE-123)

8 8 8
9 9 9
10 10 10
11 11 11
12 12 12
13 13 13
14 14 14
15 15 15
16 16 16
17 17 17
18 18 18
19 19 19
20 20 20

Graph:

1. Plot the input characteristics by taking VBE on X-axis and IB on Y-axis at a constant VCE as a
constant parameter.

2. Plot the output characteristics by taking VCE on X-axis and taking IC on Y-axis taking IB as a
constant parameter.

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Department of Electronic Engineering
Faculty of Engineering and Technology
University of Sindh, Jamshoro
Electronic Devices and Circuits (EE-123)