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Faculty of Engineering

Department

OfElectrical & Electronic Engineering

EEE 3100

Electrical & Electronic Technology

Lab 10: DC Analysis for Bipolar Junction Transistor (BJT)

Name: NOOR SUHAIDA GALIP

Matric No: 140007

Lecturer: PN RIBHAN ZAFIRA ABDUL RAHMAN

TABLE OF CONTENT:

PAGES:

1. TITLE

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2. OBJECTIVE 1

3. EQUIPMENTS & COMPONENTS 1

4. RESULT 3

5. DISCUSSION 5

6. CONCLUSION 6

7. REFERENCES 6

8. APPENDIX 7

LAB 10: DC Analysis for Bipolar Junction Transistor (BJT).

OBJECTIVE: To determine operational range of a BJT.

EQUIPMENTS & COMPONENTS:

1) Resistors

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2) Bipolar Junction Transistor (BJT)

3) Capacitor

4) Function generator

5) Multimeter

6) Oscilloscope

7) Connecting wires

RESULT

1. Transistor diagram and its symbol.

Simple circuit using a transistor

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Schematic symbols for PNP- and NPN-type BJT.

2. By using a multimeter,

a) IB = 47.7 mA

b) IC = 5.34 mA

c) VCE = 0.426 V

d) VB = 12.63 V

e) VC = 11.60 V

f) VBC = 1.03 V

3. Example calculation:

VCC = IBRB + VBE

IB = VCC - VBE

RB

= 12 0.7

270

= 4 1 .8 5 A

IC = IB

= 110 (41.85 A)= 4.6035 mA

VCC = ICRC + VCE

VCE = 12 (4.6035 mA) (2.2 k)

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= 1.87 V

VC = VCE = 1.87 V

VB = VBE = 0.7 V

VBC = 0.7 1.87 = - 1.17 V

DISCUSSION

The BJT is the most common transistor. It consists of three sections of

semiconductors: an emitter, a base and a collector. In an npn-type BJT, the

emitter and the collector are made of n-type semiconductors and the base is

made of a p- type semiconductor. In a pnp-type BJT, it is the other way

round. The three sections of a BJT form two p-n junctions: the emitter-base

junction and the collector-base junction. Individually, these junctions are not

different from the p-n junction in a diode. The unique characteristics of the

BJT originate from an interaction between these two junctions.

The operating mode of a BJT depends on how its junctions are biased.

The BJT is biased to operate in the active mode in applications where it is

used as an amplifier. In the cut-offand saturation modes, the BJT behaves

like an open and closed switch, respectively. Most BJTs in digital circuits (logic

gates, memory) operate in these two modes. The reverse active mode is

rarely used and is listed here for reference.

In a typical transistor circuit, the transistor is connected to an input

circuit and an output circuit or load. (Additional components are often

necessary to bias the BJT.) One of the terminals of the BJT (E, B or C) is

connected to both the input and the output circuit. The configuration of a BJT

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in a circuit is named after this common terminal. Thus, we speak ofcommon-

emitter, common-base and common-collectorconfigurations.

Schematic symbols for PNP- and NPN-type BJTs

CONCLUSION

From this experiment, we are able to determine operational range of

bipolar junction transistor (BJT).

APPENDIX

1) Resistors

2) Bipolar Junction Transistor (BJT)

3) Capacitor

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4) Function generator

5) Multimeter

6) Oscilloscope

7) Connecting wires

REFERENCES

1. Lab manual EEE3100.

2. Giorgio Rizzoni, Principle and Applications of Electrical Engineering,

McGraw Hill, fourth edition.

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