Laboratory Report Cover/Worksheet
DeVry University
College of Engineering and Information Sciences
Course Number:ECET220
Professor:
Laboratory Number:
2
Laboratory
Title:Analysis
of BJT Amplifier Classes of Operation using Simulation and Actual Construction
Submittal Date:
Objectives:
1.
To analyze a BJT
Amplifier Classes Amplifier comprising of two capacitors (C) and resistors (R)
and measure voltage drops and currents at different locations.
2.
To theoretically
calculate and verify the circuit using Ohm’s law and Kirchhoff’s law, which
were learned in previous courses.
3.
Determine the
voltages (V_{E}, V_{C}, V_{B}) with respect to the
circuit common. Measure and verify the same using the simulation.
4.
Determine if the
output voltage is inphase or outofphase with its input waveform.
Results:
The
theoretical calculations, simulation, and construct for the DC measurements
were as expected. The AC portion were the same for the theoretical and
simulation, however for the build they were not as expected. It is possible the
voltage was not correct, so the results were skewed.
Conclusions:
The
analysis of the BJT Amplifier confirmed the theoretical calculations and
simulation to be very close to accurate. The construct confirmed the DC portion
of the BJT Amplifier, and if the AC construct is accurate, the construct will
confirm the AC portion of the BJT Amplifier.
Team:



ECET220




Name


Program


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Name


Program


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Name


Program


Signature

Observations/Measurements:
III. A. 1. Theoretical analysis of the circuit:
Calculate Voltages Below

Voltages (V)

Voltage from
emitter to common (V_{E}) =


Voltage from
collector to common (V_{C})


Voltage from base
to common (V_{B})


Calculate: Voltage
drop between collector and emitter (V_{CE})


Calculate: Voltage
drop between base and emitter (V_{BE})


Voltage across the
collector resistor (R_{2})


Calculate Current Below


Collector current


Table 1
III. B. 2. Multisim
simulation and circuit measurements:
Calculate Voltages Below

Voltages (V)

Voltage from
emitter to common (V_{E})


Voltage from
collector to common (V_{C})


Voltage from base
to common (V_{B})


Calculate: Voltage
drop between collector and emitter (V_{CE})


Calculate: Voltage
drop between base and emitter (V_{BE})


Voltage across the
collector resistor (R_{2})


Calculate Current Below


Collector current


Table
2
III. B. 5. Paste
input and output waveforms from oscilloscope below:
Input
waveform:
Output
waveform:
a. What is the peak to peak voltage of V_{in}
from the Oscilloscope waveform?
Peak to peak voltage of V_{in} =


b. What is the peak to peak voltage of V_{out}
from the Oscilloscope waveform?
Peak to peak voltage of V_{out} =


c. Are the V_{in} and V_{out}
waveforms in phase or out of phase?
Are V_{in} and V_{out}
waveforms in phase?

d. Calculate the voltage gain (A_{V}) of
this circuit?
III. B. 7. Paste input and output waveforms from
oscilloscope below
Input
waveform:
Output waveform:
a.
What is the peak to peak voltage of V_{in}
from the Oscilloscope waveform?
Peak to peak voltage of V_{in} =


b. What is the peak to peak voltage of V_{out}
from the Oscilloscope waveform?
Peak to peak voltage of V_{out} =


III. C. 1. Place a digital photo of your circuit below:
III. C. 3. Hardware circuit and circuit measurements:
Calculate Voltages Below

Voltages (V)

Voltage from emitter
to common (V_{E})


Voltage from
collector to common (V_{C})


Voltage from base
to common (V_{B})


Calculate: Voltage
drop between collector and emitter (V_{CE})


Calculate: Voltage
drop between base and emitter (V_{BE})


Voltage across the
collector resistor (R_{2})


Calculate Current Below


Collector current


Table 3
III. C. 4. Paste input and output waveforms from
oscilloscope below:
Input
waveform:
Output waveform:
a. What is the peak to peak voltage of V_{in}
from the Oscilloscope waveform?
Peak to peak voltage of V_{in} =


b. What is the peak to peak voltage of V_{out}
from the Oscilloscope waveform?
Peak to peak voltage of V_{out} =


c. Are the V_{in} and V_{out}
waveforms in phase or out of phase?
Are V_{in} and V_{out}
waveforms in phase ?


d. Calculate the voltage gain (A_{V}) of
this circuit?
III. C. 6. Paste input and output waveforms from
oscilloscope below:
a. What is the peak to peak voltage of V_{in}
from the Oscilloscope waveform?
Peak to peak voltage of V_{in} =


b. What is the peak to peak voltage of V_{out}
from the Oscilloscope waveform?
Peak to peak voltage of V_{out} =


IV. Summary – Please answer the following questions:
a) Did your theoretical calculations closely match the results
obtained from the Multisim simulation? (Yes, No)
b) Did your theoretical calculations closely match the results
obtained from the Proto Board circuit? (Yes, No)YES and No
c) Did your results obtained from the Multisim simulation closely
match the results obtained from the Proto Board circuit? (Yes, No)YES