MOSFET Common Gate Amplifier (Small Signal Analysis) Explained

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  • Опубліковано 9 січ 2025

КОМЕНТАРІ • 36

  • @ALLABOUTELECTRONICS
    @ALLABOUTELECTRONICS  4 роки тому +12

    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/

  • @honeypaaturi9979
    @honeypaaturi9979 Рік тому +4

    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.......🙏🏻

  • @rohlay00
    @rohlay00 3 роки тому +1

    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.

  • @pedrojglez3952
    @pedrojglez3952 7 місяців тому +2

    Thank you very much for these videos, you are saving my semester

  • @tomc642
    @tomc642 4 роки тому +3

    I like all your lectures, but was looking forward to Mosfets. This is fundamental to IC design.

  • @TechnicallyExplained
    @TechnicallyExplained 4 роки тому +2

    Congratulations on 300k subscribers...

  • @umahnator8613
    @umahnator8613 2 роки тому

    Hi great vid for 10:00 are the two resistors removed because rte capacitor acts as a bypass capacitor

  • @pavansai6338
    @pavansai6338 2 роки тому

    Nice explanation sir👍

  • @denebvegaaltair1146
    @denebvegaaltair1146 3 роки тому

    @3:00 why does the small-signal output resistance ro not show up?

    • @ALLABOUTELECTRONICS
      @ALLABOUTELECTRONICS  3 роки тому +1

      The effect of channel lenght modulation has been neglected during the analysis.

    • @denebvegaaltair1146
      @denebvegaaltair1146 3 роки тому +1

      @@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

  • @honeypaaturi9979
    @honeypaaturi9979 Рік тому

    What if the length modulation coefficient is present? Will the all derived equations remain same?

  • @styrishrodrigues
    @styrishrodrigues 4 роки тому +6

    Electronics is love ❤️🔥

  • @zhengmingfan2635
    @zhengmingfan2635 10 місяців тому

    How often is the small signal analysis on the transistor component level is used during the real work in the hardware design?

    • @ALLABOUTELECTRONICS
      @ALLABOUTELECTRONICS  10 місяців тому

      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.

  • @miguelrocha5429
    @miguelrocha5429 2 роки тому +1

    Hi, I'm a bit confused as to why Id + Io = 0 around 14:18

    • @ALLABOUTELECTRONICS
      @ALLABOUTELECTRONICS  2 роки тому

      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.

  • @gedelagouthami8494
    @gedelagouthami8494 3 роки тому

    What is the current gain of the common gate amplifier

  • @MamBoidd
    @MamBoidd 2 місяці тому

    How is Zi = 1/gm || Rs? in 16:51......

  • @shilpashrees8058
    @shilpashrees8058 2 роки тому

    10:35 sir why it is 1/gm

    • @ALLABOUTELECTRONICS
      @ALLABOUTELECTRONICS  2 роки тому

      10:50 onwards, I have explained the complete procedure. Please go through it, you will get it.

  • @瑄-i2w
    @瑄-i2w 6 днів тому

    How is gm + 1/Rs = 1/Rs + 1/Vgm in 12:29 ? What is Vgm😅

  • @tiendungnguyen5567
    @tiendungnguyen5567 4 місяці тому

    how to caculate Zin of last circuit?

    • @ALLABOUTELECTRONICS
      @ALLABOUTELECTRONICS  4 місяці тому

      Would you please mention the timestamp where your are referring ?

  • @mayankjoshi5854
    @mayankjoshi5854 2 роки тому

    Can you please explain that while doing the AC analysis why do we short the capacitors?

    • @ALLABOUTELECTRONICS
      @ALLABOUTELECTRONICS  2 роки тому +3

      For low frequency AC analysis, the reactance of the capacitor will be very low. And therefore, they can assumed to be short circuit.

  • @donfab66
    @donfab66 3 роки тому

    is the Mosfet shown in schematics a depletion type Mosfet?

  • @zunairakhalid7358
    @zunairakhalid7358 4 роки тому

    sir i have a qs kindly help I dont have enough time

  • @styrishrodrigues
    @styrishrodrigues 4 роки тому +2

    First

  • @dilkhushtechno2045
    @dilkhushtechno2045 Рік тому

    Sir please Hindi me video dale

  • @-NingtalakbeRiame
    @-NingtalakbeRiame Рік тому

    Can't understand your teaching bro... How could u erase things so easily and add whenever u want...how could we make note?

    • @ALLABOUTELECTRONICS
      @ALLABOUTELECTRONICS  Рік тому +3

      you can just pause the video and take the note 😀. You can even take the screenshot if required.

    • @pnts1306
      @pnts1306 Рік тому

      Simple. First watch the video. Then make the notes