Series-shunt Feedback Amplifier Explained: Computing Voltage Gain & Impedances
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- Опубліковано 25 сер 2024
- How to find closed-loop Gain and impedances of (Voltage-Voltage) Series-Shunt Feedback Amplifier Circuit are discussed in this series-parallel Feedback Amplifier Tutorial using a cascade of BJT transistor example. This feedback voltage amplifier is implemented with two stages of NPN Bipolar junction transistors that are biased in the active region. For more examples see the analog circuits and feedback amplifier videos playlist • Electrical Engineering... . This Series-Shunt Feedback Amplifier Tutorial starts with evaluating the Negative Feedback throughout the circuit and identifying the open loop amplifier and feedback circuit network. Then the DC bias analysis is presented to find the quiescent points or the steady-state DC voltages and currents of the BJT transistors to find the value of AC parameters of the BJT transistor hybrid model (including hie or base ac impedance which is thermal voltage VT divided by the Base current of the BJT transistor). These parameters are then used to find the overall open-loop AC gain and feedback factor Beta of the circuit to find the loop gain of the amplifier and then the closed-loop gain of the feedback network. Both input impedance and output impedance with and without feedback are computed as well.
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Much appreciations professor, very clearly explained.
Thank you very much for the encouraging comment. Glad that my circuit analysis videos are useful. For more Analog Amplifier Circuits please see: Feedback Amplifier with JFET & BJT Transistors ua-cam.com/video/NB1-mYglXsY/v-deo.html
Feedback Amplifier with BJT: How to find DC Bias and AC Gain ua-cam.com/video/6dLMxpLNKv4/v-deo.html
I hope these videos are interesting as well. 🙋♂️
Great explanation of the series shunt feedback amplifier! I look forward to more of your videos!
Thank you! Glad that you liked this video. I just posted a video of PhotoDiode Amplifier with Howland Current source and current Inverter ua-cam.com/video/ILK6rakvJc8/v-deo.html , I hope it is interesting as well.
Very good explanation Thank you !
You're welcome! I'm glad that you liked this feedback amplifier circuit analysis video. Here are a few more Analog Circuit examples: Feedback Amplifier with JFET & BJT Transistors ua-cam.com/video/NB1-mYglXsY/v-deo.html
Feedback Amplifier with BJT: How to find DC Bias and AC Gain ua-cam.com/video/6dLMxpLNKv4/v-deo.html
I hope these videos are interesting as well. 🙋♂️
Fantastic analysis of the circuit, nobody else is bothering explaining circuits like you do, thank you so much and keep up the good work!
You're welcome! Thank you for the encouraging comment. Glad that you like my circuit analysis videos. I recently broke the 200+ videos circuit design playlist into smaller more focused playlists. I hope that new playlists are helpful as well. 🙋♂️
Thanks for watching. For more Op Amp Circuits please see:
Feedback Amplifier with JFET & BJT Transistors ua-cam.com/video/NB1-mYglXsY/v-deo.html
Op Amp Amplifier with Electronic Gain Control ua-cam.com/video/NoNgQpbj77Y/v-deo.html
Feedback Amplifier with BJT: How to find DC Bias and AC Gain ua-cam.com/video/6dLMxpLNKv4/v-deo.html
Push-Pull Power Amplifier with Darlington Transistors ua-cam.com/video/866MYibo8yE/v-deo.html
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For more analog circuits and signal processing examples see: ua-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html
I hope these Circuit design and analysis examples and videos are useful and interesting. 🙋♂
Prof ; PLEASE EXPLAIN, HOW DO WE DESIGN DIRECT COUPLE V_V FEED BACK STAGE USING NPN TRANSISTORS.
Good question. I hope the following circuit videos answer your question:
Feedback Amplifier with BJT: How to find DC Bias and AC Gain ua-cam.com/video/6dLMxpLNKv4/v-deo.html
Feedback Amplifier with JFET & BJT Transistors ua-cam.com/video/NB1-mYglXsY/v-deo.html
I hope these feedback circuits videos are helpful.
great video prof, explained very well! Can you explain a similar BJT schematic with an amplitude feedback like AGC (Automatic Gain Control) please? This is a particular circuitery used in the radio receivers or microphone amplifier to avoid saturation in chase of received signal is too big, for example adding an envelop detector in the feedback. thank you!
You are welcome. Thank you for watching & encouraging comment. Glad that you liked this video. Thanks for your suggestion as well. Sure, I'll prepare a BJT transistor circuit with Gain Control. I'll post it in my Analog Circuit videos collection ua-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html.
For more Analog Amplifier Circuits please see:
Feedback Amplifier with JFET & BJT Transistors ua-cam.com/video/NB1-mYglXsY/v-deo.html
Op Amp Amplifier with Electronic Gain Control ua-cam.com/video/NoNgQpbj77Y/v-deo.html
Feedback Amplifier with BJT: How to find DC Bias and AC Gain ua-cam.com/video/6dLMxpLNKv4/v-deo.html
I hope these videos are interesting as well 🙋♂️
@@STEMprof thank you in advance , I Will follow your channel and will share at my friends and colleagues! Best Regards
Thank you very much@@STEMprof !
My pleasure! Thanks again for your comment & suggestion. I'll try to prepare a Gain or Attenuattion Control example hopefully soon 🙋♂️
@@user-qi6yy8uv7v You're welcome! I appreciate your comment & interest in my channel. Please let me which topics or circuits you are interested to see. I'll prepare related videos & examples accordingly. Thanks again 🙏
THE PROBLEM IS , WE HAVE TO USE VERY HIGH VALUES FOR VOLTAGE DIVIDER BIAS NETWORK .IS IT OK?
As explained in the video, yes, as long as the current through bias resistors is considerably larger than the base current of the corresponding BJT transistor. Here are a few more examples: Feedback Amplifier with JFET & BJT Transistors ua-cam.com/video/NB1-mYglXsY/v-deo.html
Feedback Amplifier with BJT: How to find DC Bias and AC Gain ua-cam.com/video/6dLMxpLNKv4/v-deo.html
I hope these feedback circuits videos are helpful.
Thank you for video. In what applications would you use this circuit?
You're welcome. Thanks for watching. Audio amplifiers is an example of application for this feedback amplifier circuit. For more Analog Amplifier Circuits please see:
Feedback Amplifier with JFET & BJT Transistors ua-cam.com/video/NB1-mYglXsY/v-deo.html
Op Amp Amplifier with Electronic Gain Control ua-cam.com/video/NoNgQpbj77Y/v-deo.html
Feedback Amplifier with BJT: How to find DC Bias and AC Gain ua-cam.com/video/6dLMxpLNKv4/v-deo.html
I hope these videos are useful and interesting 🙏
@@STEMprof thank you for answering
You are welcome.