MOSFET Common Gate Amplifier (Small Signal Analysis) Explained
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- Опубликовано: 7 окт 2024
- In this video, the small-signal analysis of the Common Gate (CG) Amplifier is explained. And through small-signal analysis, the expression of the input impedance, output impedance, and voltage gain is derived.
Throughout the discussion and derivation, the effect of channel length modulation is neglected. ( λ = 0 is assumed)
The link for the separate note for the small-signal analysis when λ is non-zero or the output impedance of the MOSFET is finite.
www.allaboutel...
MOSFET Common Gate Amplifier:
In the Common Gate amplifier, the input and output are in phase. (The voltage gain is positive).
The input impedance of the CG amplifier is very low. And typically it is used in high-frequency applications as an amplifier for impedance matching.
In this video, initially, using a very basic common gate amplifier circuit, the small-signal analysis is carried out and at the later part of the video, the small-signal analysis of the actual circuit is carried out.
The link for the more useful videos related to MOSFET:
1) Enhancement Type MOSFET:
• MOSFET - Enhancement T...
2) MOSFET Biasing: Enhancement Type MOSFET Biasing Explained
• MOSFET Biasing : Enhan...
3) MOSFET Channel Length Modulation
• MOSFET- Channel Length...
4) MOSFET Small Signal Model:
• MOSFET Transconductanc...
5) MOSFET Common Source Amplifier (Voltage Divider Bias)
• MOSFET Common Source A...
This video is helpful to all the students of science and engineering for understanding the small-signal analysis of the Common Gate MOSFET amplifier.
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Please Note: Throughout the discussion and derivation, the effect of channel length modulation is neglected. ( λ = 0 is assumed)
The link for the separate note for the small-signal analysis when λ is non-zero or the output impedance of the MOSFET is finite.
www.allaboutelectronics.org/mosfet-common-gate-amplifier/
The beauty of your vedios is they are notes-proof. Understanding the concept easily and effectively is the first boon we're getting and Additional to that just the explanation points are making us a well organised notes. Hat's off!! Can't say enough thanks.......🙏🏻
I had been 2 hours trying to derive the gain expression and I just couldn't do it, it seemed impossible, so came to Google, and here I found my answer!!! What a cheeky little answer, Puttin the Zin and this!!! Vo / Vs = Vo / Vx * Vx / Vs
Looks easy now, but without knowing those details it would've been impossible. A millian thanks my friend.
This "trick" actually looks very useful for solving circuits in general. I'm doing electronics engineering and never has a lecturer mentioned it.
I honestly believe the future of education lies in short concise clear video explanations like these. We can literaly perfect explanations and not depend on fallible unpassionate humans. Thank you. This has been a life saver.
I like all your lectures, but was looking forward to Mosfets. This is fundamental to IC design.
Thank you very much for these videos, you are saving my semester
Congratulations on 300k subscribers...
Electronics is love ❤️🔥
Nice explanation sir👍
What if the length modulation coefficient is present? Will the all derived equations remain same?
What is the current gain of the common gate amplifier
How often is the small signal analysis on the transistor component level is used during the real work in the hardware design?
It is useful while designing a amplifier circuits. Of course, now a days, the CAD tools are available, which will include all these aspects during the simulation. But still, it is good to know how exactly these calculations are performed. Having this knowledge is always beneficial during troubleshooting or new designs.
Hi great vid for 10:00 are the two resistors removed because rte capacitor acts as a bypass capacitor
how to caculate Zin of last circuit?
Would you please mention the timestamp where your are referring ?
@3:00 why does the small-signal output resistance ro not show up?
The effect of channel lenght modulation has been neglected during the analysis.
@@ALLABOUTELECTRONICS got it. Thanks so much for replying! I'm just new at all this analysis and, even in lecture, always gets confused about when and why ro shows up and when it doesn't :'D
Can you please explain that while doing the AC analysis why do we short the capacitors?
For low frequency AC analysis, the reactance of the capacitor will be very low. And therefore, they can assumed to be short circuit.
sir i have a qs kindly help I dont have enough time
10:35 sir why it is 1/gm
10:50 onwards, I have explained the complete procedure. Please go through it, you will get it.
is the Mosfet shown in schematics a depletion type Mosfet?
No, it is enhancement type MOSFET.
First
Hi, I'm a bit confused as to why Id + Io = 0 around 14:18
Io is the current flowing through Rd (downward direction). If we apply the KCL at the node D, then the summation of both outgoing currents (io + Id) will be zero.
Sir please Hindi me video dale
Can't understand your teaching bro... How could u erase things so easily and add whenever u want...how could we make note?
you can just pause the video and take the note 😀. You can even take the screenshot if required.
Simple. First watch the video. Then make the notes