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J601_lec11
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Ahmad El-Banna
December 28, 2014
Education
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J601_lec11
5th Year, ITEC
lec#11, Electronic Pricncipals
Ahmad El-Banna
December 28, 2014
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Transcript
Lecture #11 Feedback Circuits Instructor: Dr. Ahmad El-Banna December 2014
J-601-1448 Electronic Principals Integrated Technical Education Cluster At AlAmeeria © Ahmad El-Banna
Agenda 2 J-601-1448 , Lec#11 , Dec 2014 © Ahmad
El-Banna Feedback Concepts Feedback Connection Types Practical Feedback Circuits
Simple block diagram of feedback amplifier 3 J-601-1448 , Lec#11
, Dec 2014 © Ahmad El-Banna Some improvements are : 1. Higher input impedance. 2. Better stabilized voltage gain. 3. Improved frequency response. 4. Lower output impedance. 5. Reduced noise. 6. More linear operation.
FEEDBACK CONNECTION TYPES 4 J-601-1448 , Lec#11 , Dec 2014
© Ahmad El-Banna • Series feedback connections tend to increase the input resistance, whereas shunt feed-back connections tend to decrease the input resistance. • Voltage feedback tends to decrease the output impedance, whereas current feedback tends to increase the output impedance.
Gain with Feedback 5 J-601-1448 , Lec#11 , Dec 2014
© Ahmad El-Banna
Input Impedance with Feedback 6 J-601-1448 , Lec#11 , Dec
2014 © Ahmad El-Banna
Output Impedance with Feedback 7 J-601-1448 , Lec#11 , Dec
2014 © Ahmad El-Banna
Example 8 J-601-1448 , Lec#11 , Dec 2014 © Ahmad
El-Banna
Effects of feedback on Gain and Bandwidth 9 J-601-1448 ,
Lec#11 , Dec 2014 © Ahmad El-Banna
Practical Feedback Circuits 10 J-601-1448 , Lec#11 , Dec 2014
© Ahmad El-Banna
Using OP-Amp & Emitter follower 11 J-601-1448 , Lec#11 ,
Dec 2014 © Ahmad El-Banna Check EXAMPLE 14.4
Current Series Feedback 12 J-601-1448 , Lec#11 , Dec 2014
© Ahmad El-Banna
Voltage Shunt Feedback 13 J-601-1448 , Lec#11 , Dec 2014
© Ahmad El-Banna
• For more details, refer to: • Chapter 14, Electronic
Devices and Circuits, Boylestad. • The lecture is available online at: • https://speakerdeck.com/ahmad_elbanna • For inquires, send to: • ahmad.elbanna@feng.bu.edu.eg 14 © Ahmad El-Banna J-601-1448 , Lec#11 , Dec 2014