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Common Emittor Simulation

This document describes an experiment to analyze the DC and AC parameters of a common emitter BJT amplifier circuit. Key components include a BJT transistor, resistors, capacitors, function generator and oscilloscope. The theory section explains that in a common emitter amplifier, the input is the base and emitter and output is the collector and emitter. It also notes there is a 180 degree phase shift between the input and output waveforms. The experiment section describes connecting the circuit, measuring voltages with and without a bypass capacitor, and comparing the readings.

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ArsalanAli
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27 views5 pages

Common Emittor Simulation

This document describes an experiment to analyze the DC and AC parameters of a common emitter BJT amplifier circuit. Key components include a BJT transistor, resistors, capacitors, function generator and oscilloscope. The theory section explains that in a common emitter amplifier, the input is the base and emitter and output is the collector and emitter. It also notes there is a 180 degree phase shift between the input and output waveforms. The experiment section describes connecting the circuit, measuring voltages with and without a bypass capacitor, and comparing the readings.

Uploaded by

ArsalanAli
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Common Emittor Amplifier

OBJECT:
To operate BJT as a common emittor amplifier and analyze its dc
and ac parameters (Simulation)
APPARATUS:
DC Power Supply. Capacitors.
Function Generator. Bread Board.
Oscilloscope. Jumper Wires.
Multimeter. Transistor NPN.
Resistors.

THEORY:
In a common emittor ampifier, the circuits input terminals are the
transistor base and emitter, and the output terminals are the collector and
the emitterit is seen that there is a 1800 phase shift between the input and
output waveforms of a common emittor amplifier. This can be understood
by considering the effect of a positive going input signal. When VS increases
in a positive direction, it increases the transistor VBE. The increase in VBE
raises the level of Ic, thereby increasing the drop across Rc, and thus
reducing the level of the Vc. The changing level of Vc is capacitor-coupled to
the circuit output to produce the ac output voltage, Vo. As Vs increases in a
positive direction, Vo goes in a negative direction.
A Common Emitter BJT amplifier provides both the voltage and current
gain.

EXPERIMENT:
Connect circuit according to the circuit diagram.
Measure voltage VB, VC, VE and VCE.
Connect Function Generator and measure voltage VB, VC, VE
and VCE from oscilloscope. The reading at collector should
be taken with without bypass capacitor and also take a
reading by bypassing only one resistor.
Compare the voltage obtained at the collector with and
without bypass capacitor.

PRECAUTIONS:
Check connections properly before applying Power supply.
Take care about polarities of Power Supply and Multimeter.
Set power supply to appropriate voltage before taking any
reading.
CIRCUIT DIAGRAM:

OBSERVATIONS:
% Error
S.No. Parameter Observed Values Calculated Values

1
2
3
4
5
6
7
8
9

10
SIMULATION
DC Parameters
AC parameters

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