labs 6 & 7 and assignment expectations are uploaded.you can use falsad.com to draw a circuit.let me know if you need anything.
lab6_peak_detectors_and_voltage_doublers_sp19.pdf
lab7_bipolar_junction_transistor_sp19.pdf
enee_3720l_prelab_guidelines.pdf
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ELECTRICAL ENGINEERING DEPARTMENT
ENEE 3720L – Analog Electronics Laboratory
Laboratory #6 – Peak Detectors and Voltage Doubler
Objective:
The purpose of this experiment is to study the characteristic of a peak detector circuit and its
application as well as characteristics of a voltage doubler. Analysis will consist of implementing
the circuits in the laboratory and taking measurements.
Equipment:
• Diodes: 1N4148
• Assorted Resistors & Capacitors
• Functional Generator
•
•
•
DC Power Supply
Digital Multimeter
Oscilloscope
Procedure:
Part A: Peak Detector
Figure 1: Peak Detector
1) Construct the circuit in Figure 1 with the input voltage of 10 Vp-p and C of 1 µF. Record
actual value of the voltage.
2) Set the oscilloscope in DC mode.
3) Connect the input of the circuit to the function generator and to channel 1 of the
oscilloscope. Connect output to channel 2 of the oscilloscope.
4) Measure and record the peak level of the output voltage using the oscilloscope.
5) Copy or take a snap-shot of the input and output voltages superimposed on each
other from the oscilloscope. Make sure the zero axes of the waveforms are aligned
together, and centered on the screen.
6) Add a 220 kΩ resistor in parallel to the capacitor. Repeat step 4 above. Why do you
add a resistor? Measure and record the resistor with associated tolerance.
Lab #6 – Peak Detectors and Voltage Doubler
Page 1 of 3
ELECTRICAL ENGINEERING DEPARTMENT
ENEE 3720L – Analog Electronics Laboratory
Laboratory #6 – Peak Detectors and Voltage Doubler
7) Measure and record the peak level of the output voltage using the oscilloscope.
8) Explain why the peak output voltage is not exactly equal to the peak input voltage?
9) Replace the resistor with a 10 kΩ and repeat Steps 6 and 7 above.
10) Explain why the output voltage is different from what was obtained while using the
220 kΩ?
11) What is the major effect of replacing the 220 kΩ resistor with the 10 kΩ resistor?
Explain.
12) Replace the resistor with a 1 MΩ and repeat Steps 6 and 7 above.
13) What is the output voltage trend with the three resistor values (i.e. 10 kΩ, 220 kΩ and
1 MΩ)? Explain.
14) Summarize the results of the output voltage levels in a tabular form and display a
comparison plot using bar chart showing the voltage levels for the three resistor
values.
Part B: Voltage Doubler
Figure 2: Voltage Doubler
1) Construct the circuit in Figure 2 with the input voltage, VIN of 10 Vp-p and C1 and C2 of
1 µF. Record actual value of the voltage.
2) Set the oscilloscope in DC mode.
Lab #6 – Peak Detectors and Voltage Doubler
Page 2 of 3
ELECTRICAL ENGINEERING DEPARTMENT
ENEE 3720L – Analog Electronics Laboratory
Laboratory #6 – Peak Detectors and Voltage Doubler
3) Connect the input of the circuit to the function generator and channel 1 of the
oscilloscope. Connect the output to the channel 2 of the oscilloscope.
4) Measure and record the peak level of the output using the oscilloscope.
5) Copy or take a snap-shot of the input and output voltages superimposed on each
other from the oscilloscope. Make sure the zero axes of the waveforms are aligned
together and centered on the screen.
6) What would the output voltage be if the diodes were ideal?
7) Add a 220 kΩ resistor in parallel to the C2 Repeat step 4 above. Measure and record
the resistor with associated tolerance.
8) Measure and record the peak level of the output using the oscilloscope.
9) Is this peak output voltage exactly equal to the peak input voltage? Explain.
10) Replace the resistor with a 10 kΩ and repeat Steps 6 and 7 above.
11) Explain why the output voltage is different from what was obtained while using the
220 kΩ?
12) What is the major effect of replacing the 220 kΩ resistor with the 10 kΩ resistor?
Explain.
13) Replace the resistor with a 1 MΩ and repeat Steps 6 and 7 above.
14) What is the output voltage trend with the three resistor values (i.e. 10 kΩ, 220 kΩ and
1 MΩ)? Explain.
15) Summarize the results of the output voltage levels in a tabular form and display a
comparison plot using bar chart showing the voltage levels for the three resistor
values.
16) Discuss the operational circuit of voltage doubler and its composition. Can this
technique be extended to provide output DC voltages that are higher multiples of the
input voltage? Explain in detail.
Lab #6 – Peak Detectors and Voltage Doubler
Page 3 of 3
ELECTRICAL ENGINEERING DEPARTMENT
ENEE 3720L – Analog Electronics Laboratory
Laboratory #7 – Bipolar Junction Transistor
Objective:
The purpose of this experiment is to study the characteristic of a Bipolar Junction Transistor (BJT)
and its operating region. Analysis will consist of determining the common-emitter current gain,
β and current characteristics of the BJT circuits in the laboratory and taking measurements.
Equipment:
• BJT: 2N4401
• Assorted Resistors
• DC Power Supply
•
Digital Multimeter
Procedure:
Figure 1: BJT Circuit
1) Construct the circuit in Figure 1 with the RB = 1 MΩ, RC = 5 kΩ, and RE = 100 Ω. Set VCC
to 5 V. (DO NOT EXCEED). Measure and record the resistors with associated tolerance.
2) Gradually increase VBB until IC = 0.5 mA. Measure VBE and VBC. What is the region of
operation of the transistor?
3) Now measure IB. What is the value of β?
4) From the value found above, calculate α. Use α to calculate IE, then measure IE and
check if the values agree.
5) Look at the datasheet for the 2N4401. Does β (called hFE in the datasheet) agree with
the values given in the datasheet? If the values do not agree, explain why you might
see discrepancies.
6) Set VBB to 4 V and VCC to 2 V. Measure IB, IC, VBE, and VBC. What is the region of
operation of the BJT?
Lab #7 – Bipolar Junction Transistor
Page 1 of 2
ELECTRICAL ENGINEERING DEPARTMENT
ENEE 3720L – Analog Electronics Laboratory
Laboratory #7 – Bipolar Junction Transistor
7) Set VBB to −3 V and VCC to 5 V. Measure IB, IC, VBE, and VBC. What is the region of
operation of the BJT?
8) Swap the emitter and the collector of the BJT in the circuit by physically turning the
device to face the opposite direction. Set VBB to 4 V and keep VCC at 5 V. Measure IB,
IC, VBE, and VBC. What is the region of operation of the BJT?
9) Set RB = 100 kΩ, RC = RE = 1 kΩ. Repeat steps 2 – 4.
Lab #7 – Bipolar Junction Transistor
Page 2 of 2
ELECTRICAL ENGINEERING DEPARTMENT
PRE-LABORATORY (PRELAB) REPORTS
ENEE 3720L – ANALOG ELECTRONICS LABORATORY
PRE-LABORATORY REPORT
Each student is required to write a brief preparatory laboratory report (prelab) on each
experiment and submit it to the instructor prior to the beginning of the lab. The Preliminary
Report should provide you enough insight on how to perform and what to expect from the
experiment.
The Preliminary Report should contain the following information as applicable:
1. A cover page consisting of title, experiment, names of partner(s), course number and
section number.
2. Essential circuit diagrams (properly labeled and with all locations for pertinent
measurements clearly indicated) to be used. Any special safety precautions and/or
comments should be noted.
3. Preliminary calculations, simulations and pertinent information that may be necessary for
the completion of the experiment.
4. Explanation of anticipated results that may be theoretically obtained before any
experimental work is performed. There also should be a discussion of the meaning of the
predicted results along with their implications and possible sources of error that may be
encountered.
5. Answers to questions asked in the lab procedures that could be answered prior to the
experiment.
In addition, the student may wish to include for his own future certain theoretical material which
he has developed and /or copied from references. The source of the reference material used
should be given.
A well-prepared Preliminary Report will allow the student team to proceed with the laboratory
work without delay and with little, if any assistance from the laboratory instructor.
…
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