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EXPERIMENT NO. 4 Transistor Common-Emitter Configuration
Characteristics
Group 5:Dela Cruz, Mark LouieMendoza, Allen RodneySampayan,
GlennTambaoan, Christian Alan
DATA:
A.) Input characteristics:
VBB VCE = 1 V V CE = 2 V V CE = 4 V
VBE (V) I B (A) VBE (V) I B (A) VBE (V) I B (A)0 V 2.007x10 -11
V -0.0002007 A 2.229x10 -11 V -0.0002288 A 2.852X10 -11 V
-0.0002852 A 6 V 0.886 V 51139 A 0.887 V 51132 A 0.888 V 51118
A
12 V 0.978 V 110222 A 0.97844 V 110216 A 0.98 V 110202 A18 V
1.06 V 169404 A 1.06 V 169397 A 1.062 V 169384 A24 V 1.138 V 228624
A 1.138 V 228617 A 1.14 V 228605 A
30 V 1.214 V 287864 A 1.124 V 287858 A 1.215 V 287845 AB.)
Output characteristics:
S. No.IB = 50 A I B = 75 A I B = 100 A
VCE (V) I C (mA) V CE (V) I C (mA) V CE (V) I C (mA)0 V
-0.003314 V 0.003315 mA 0.000003586 V 0.003586 mA -0.000003749 V
0.003749 mA6 V 0.08142 V 5.919 mA 0.064 V 5.936 mA 0.055 V 5.945
mA
12 V 0.141 V 11.86 mA 0.101 V 11.899 mA 0.085 V 11.915 mA18 V
3.049 V 14.951 mA 0.148 V 17.852 mA 0.115 V 17.885 mA24 V 8.082 V
15.918 mA 2.365 V 21.635 mA 0.158 V 23.842 mA30 V 13.115 V 16.885
mA 7.05 V 22.95 mA 2.082 V 27.918 mA
GRAPH:
A.) Input characteristics:
-0.0002852
51118
110202
169384
228605
287845
-50000
0
50000
100000
150000
200000
250000
300000
350000
0.00E+00 2.00E-01 4.00E-01 6.00E-01 8.00E-01 1.00E+00 1.20E+00
1.40E+00
1V 2V 3V
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B.) Output characteristics:
RESULT: The input and output characteristics of transistor
connected in CE configuration have been observedand the of the
transistor is calculated as _____ and its input and output
Resistances are ______ and
________.
VIVA QUESTIONS:
1.) What is the range of for the transistor? The value of ranges
from 50 -400.
2.) What are the input and output impedances of CE
configuration? The input impedance would be higher and output
impedance would be lower in a CE
configuration.
3.) Identify various regions in the output characteristics.
Cut-off region
Saturation region
4.) What is the relation between and ? The DC Current Gain of
the device is Beta, ( ). Also, Alpha ( ), the current gain of
the
transistor from the Collector terminal to the Emitter terminal
and is a function of thetransistor itself. As the emitter current
is the sum of a very small base current plus avery large collector
current, the value of alpha , is very close to unity. While
Betareveals the magnitude of one current to the other.
5.) Define current gain in CE configuration. The common-emitter
configuration is an inverting amplifier circuit, the circuit is
sometimes called as beta. Its current gained is obtained from
the ratio of base and thecollector circuit elements.
6.) Why CE configuration preferred for amplification?
Common-emitter configuration is preferred as amplification because
of its capability to
produce the highest current and power among the three
configurations.
7.) What is the phase relation between input and output?
0.003749
5.945
11.915
17.885
23.842
27.918
0
5
10
15
20
25
30
-2 0 2 4 6 8 10 12 14
1V 2V 3V
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The phase relation between the input and output is inversely
proportional to eachother. Because as the voltage input increases
the voltage output decreases.
8.) Draw diagram of CE configuration for PNP transistor.
9.) What is the power gain of CE configuration? The power gain
for the common-emitter configuration is much higher than of the
remaining two configurations.10.) What are the applications of
CE configuration?
The common-emitter configuration is mostly used as a switch, it
amplifies voltage andcurrent. Gain is the factor by which
amplification increases the voltage or current. Ithas a low input
impedance and outputs high impedance, high voltage gain and
currentgain.
