Electronics II and Lab – Week 2 Lab
JFETs
INTRODUCTION
Which types of
applications are field-effect transistors preferred over bipolar junction
transistors? Why?
Explain why
junction field-effect transistors are considered voltage-controlled devices.
EQUIPMENT
1 power supply: 15V
1 transistor:
2N4860
3 resistors:
1kΩ, 4.7kΩ, 2MΩ
<List meters
used>
PROCEDURE
Using Multisim
construct the circuits shown below:
Measure the
following and record the values in the “results” section: VG, ID, VS, VD, VDS,
RESULTS
Calculate VGS from the measured values.
Which type of
biasing is used?
The table below
shows readings for three different cases where the circuit above, was
malfunctioning. Find the fault, assuming only one device in each case has a
problem. List the steps taken to arrive at a solution.
|
|
VDS |
VD |
VS |
What is the
problem? |
|
1 |
91.4mV |
91.4mV |
0V |
|
|
2 |
66.5mV |
15V |
14.9V |
|
|
3 |
15 |
15 |
0 |
|
CONCLUSION
What did you learn?
Rules
for lab submissions:
·
The lab document must be a Word document. PDF files are NOT
accepted.
·
All screenshots must be included.
·
All Multisim screenshots must include the date/time stamp.
See TOOLS AND TEMPLATES for the procedure to display the date and time.
·
Any and all Multisim files must be submitted.
·
Any equations used must be typed in Word. Copy and paste of equations from outside sources is prohibited.
·
No graphics are allowed in the Word document other than
screenshots of circuits from Multisim and hardware if applicable, with the
date/time stamp.
·
The lab template should be used. Specifically, it is brought
to your attention that a summary MUST be provided explaining the results of the
labs, the relationship of the results to expected results, and any challenges
encountered.
·
Hardware portion of labs should include screenshots of the
assembled circuit with your name and student GID number written on paper next
to the circuit. There should be screenshots of the instrument
readings with the date and time stamp on lower right corner clearly shown. .
Any violation of
the submission rules above will result in a grade of 1.
