10 Adik

Faculty of

Engineering Department Of

Electrical & 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

1

2. OBJECTIVE

1

3. EQUIPMENTS & COMPONENTS 4. RESULT

1 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 1

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

2

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

=

41.85 µA

=

β IB

=

110 (41.85 µA)

=

4.6035 mA

VCC

=

ICRC + VCE

VCE

=

12 – (4.6035 mA) (2.2 k)

IC

3

=

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-off and 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 4

in a circuit is named after this common terminal. Thus, we speak of commonemitter, common-base and common-collector configurations.

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

5

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. 6