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1Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
Electronics IILecture 5(c): FET Amplifiers
A/Lectr. Khalid ShakirDept. Of Electrical Engineering
College of EngineeringMaysan University
2Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
SummaryTransfer characteristics
– similar shape for all forms of FET – but with a different offset– not a linear response, but over a small region might be considered to
approximate a linear response
Normal operation Ranges for FETs:
All rights reserved.Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
3
The Common-Source FET Amplifier:FET AC Model:
© 20l2 Pearson Education. Upper Saddle River, NJ, 07458.4Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:FET AC Model:
© 20l2 Pearson Education. Upper Saddle River, NJ, 07458.5Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:JFET Amplifier Operation:
© 20l2 Pearson Education. Upper Saddle River, NJ, 07458.6Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:JFET DC Analysis (Graphical & Mathematical Approach):
JFET Q-Point: Gaphical Approach, &
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.7Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:JFET DC Analysis (Graphical & Mathematical Approach):JFET Q-Point: Graphical Approach
JFET Q-Point: Mathematical Approach
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.8Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:JFET AC Analysis:Develop AC equivalent crct as shown in figure 9-8.Capacitors are short crctsReplace DC voltage source by ground (zero-volt)Signal voltage at the Gate:
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.9Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:JFET AC Analysis:
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.10Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:JFET AC Analysis: effect of AC load on Voltage Gain
11Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:Input Resistance:
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.12Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:D-MOSFET Amplifier Operation:
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.13Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:E-MOSFET Amplifier Operation:
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.14Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:E-MOSFET Amplifier Operation:
© 2012 Pearson Education. Upper Saddle River, NJ, 07458.15Electronic Devices, 9th editionThomas L. Floyd All rights reserved.
Copyright @2013 by Dept. of Electrical Engineering, Electronics II- Lecture 5(c)/1st Semester 013/014College of Engineering, Maysan University
The Common-Source FET Amplifier:E-MOSFET Amplifier Operation:
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