Which types of applications are field-effect transistors preferred over bipolar
ID: 2083382 • Letter: W
Question
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: 1k, 4.7k, 2M
<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?
VDS
VD
VS
What is the problem?
1
91.4mV
91.4mV
0V
2
66.5mV
15V
14.9V
3
15
15
0
2MQ VDD 15V R2 4.7k Q1 2N4860 R3Explanation / Answer
Applications of FET:
1.Input stage of oscilloscope.
2.Input stage of electronic volt meters.
3.Low noise amplifier.
4.Buffer amplifier.
5.Cascode amplifier.
6.Analog switch.
7.Chopper amplifier.
8.Muliplexer.
Reason: very high input impedance.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.