MOSFET - Current Mirror Explained

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In this video, what is Current Mirror, the use of the Current Mirror circuit, and the design of the Current Mirror Circuit using MOSFET is explained.
Timestamps:
0:00 Introduction
0:30 Why Current Mirrors are used?
2:11 MOSFET Current Mirror Circuit (NMOS Current Mirror)
7:18 Effect of Channe Length Modulation on Current Mirror
10:24 PMOS Current Mirror and Current Steering Circuit
14:00 Current Mirror as Active Load
What is Current Mirror:
The current mirror is an analog circuit that senses the reference current and generates the copy or number of copies of the reference current, with the same characteristics.
The replicated current is as stable as the reference current source.
The replicated current could be the same as the reference current (Icopy = Iref), or it could be either multiple or fraction of the reference current. (Icopy = N*Iref or Icopy = (1/N)*Iref)
In the video, how to generate the multiple or the fraction of the reference current using the MOS Current Mirror is explained in detail.
Why Current Mirrors are used?
Current Mirrors are particularly useful in the integrated circuits, for biasing the amplifiers.
In integrated circuits, one stable current source is fabricated within IC, and using the current mirror the multiple copies of the stable current source is generated (which can be used to bias the amplifiers)
For notes, check this link:
www.allaboutelectronics.org/w...
The link for the other useful videos related to MOSFET:
1) MOSFET Biasing: Enhancement Type MOSFET Biasing Explained
• MOSFET Biasing : Enhan...
2) MOSFET Channel Length Modulation
• MOSFET- Channel Length...
3) MOSFET Small Signal Model:
• MOSFET Transconductanc...
4) MOSFET Amplifier with Active Load:
• MOSFET (Common Source ...
5) MOSFET- Cascode Amplifier
• Cascode Amplifier usin...
This video is helpful to all the students of science and engineering for understanding what is Current Mirror Circuit, why it is used, and how it can be designed using the MOSFET.
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#MOSFET
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#MOSCurrentMirror
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4 авг 2024

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Комментарии : 64

@ALLABOUTELECTRONICS 3 года назад

For notes, check this link: www.allaboutelectronics.org/what-is-current-mirror-mosfet-current-mirror-explained/ Timestamps: 0:00 Introduction 0:30 Why Current Mirrors are used? 2:11 MOSFET Current Mirror Circuit (NMOS Current Mirror) 7:18 Effect of Channe Length Modulation on Current Mirror 10:24 PMOS Current Mirror and Current Steering Circuit 14:00 Current Mirror as Active Load

@mayurshah9131 3 года назад

PLEASE CONTINUE POSTS LIKE THIS, VERY HELPFUL 👍

@tamilchelvanramasamy8733 3 года назад

Great Sir Lucidly explained ;so perspicuous in presentation. Long live!!!!

@techlover2000 Год назад

Amazing explanation, so clear and intuitive, thank you so much!

@mohammedaftabbaig9858 3 года назад

Superb, better explanation than university profs.

@LousyPainter Год назад

Informative. Great explanation!

@li-pingho1441 3 года назад

this video saves my life. you teach much better than my professor

@abdellahibourqi2873 2 года назад

What a great explication !!! Thanks a lot

@poojashah6183 3 года назад

Best explanation 👌🏻👍🏻

@GH-zx6pt 3 года назад

Thanks a lot, very useful video

@drewpatton4275 3 года назад

This is fantastic

@arnab94mallick 3 года назад

Nice explanation.

@draflik 3 года назад

I love your videos. Can you also discuss Mosfet H Bridge design. and in the future also have a series on IGBTs. Thank you.

@geetanjalikonna3802 Год назад

Superb explanation

@SomenathGarai 2 месяца назад

Really helpful, thanks.

@aboumarakhossam 4 дня назад

Thank you, Sir, for this lecture. I have just noticed that in all your videos you refer to the Current Source using its symbol but never show what components are in and how it could be biased to give the reference current. Could please show how to construct a current source and how to bias it. Thanks

@VidhateAshok Год назад

Very Very informative..

@qemmm11 7 месяцев назад

Much appreciated 😊

@rohitv2840 9 месяцев назад

This is what internet is for!!! Thanks a lot

@mnada72 3 года назад

Thanks, yes please explain the cascode current mirror as an active load

@Gabriel_Naomi 2 года назад

Thank you teacher

@klakshmanan4358 Год назад

one doubt though, we should also include if channel length modulation for ref MOSFET too. right?

@likhithatangudu2127 3 года назад

I am big fan of your voice😁

@vinaykumarkv5830 3 года назад

Thanks man❤❤

@SayandeepBMSCE 3 года назад

Hi 😂

@yuangcao7267 Год назад

I still confused why the equation of ID doesn't include the channel length modulation? When should include it or when could ignore it?

@Gurumurthy Год назад

At 8:43 can you please say how did you arrive at the equation please?

@merveozdas1193 Год назад

hi, thsnk you for you explanation, but there ise a pmos transistor, doesn't it need to be fed source to drain? I mean drain should be negative, source should be positive.Maybe you are confused about n mos and pmos symbols.

@frankreiserm.s.8039 3 года назад

May God bless you well for making all of these videos. May God give you great electronics shop equipment. I own the company Frank Reiser Video/Audio Electronics, through which I repair peoples' consumer electronics. I make very, very little money. One reason is because I can't get replacement parts. Manufacturers do not stock replacement parts because they want you to buy new. Frank Reiser M.S.

@vinaykumarkv5830 3 года назад

Yeah make video on cascode current mirror 😊

@wongyithong9838 3 года назад

Do you have any playlists or videos about frequency response of the amplifier

@ALLABOUTELECTRONICS 3 года назад

No, it is yet to be covered on the channel. Soon, it will also be covered.

@wongyithong9838 3 года назад

ya appreciate it！

@oakspines7171 Год назад

Just come across your site now. Super Duper. Few observation items here comparing BJT vs. MOSFET Current mirror circuits, 1. With MOSFET, you can scale the W/L ratio of the other MOSFETs to get different I-Outs for the same I-mirror circuit. Not doable with BJT that you would need a different current mirror circuits, i.e. different I-Refs. Also generate I-outs source and sink from just same I-Ref of the MOSFET circuits, flexible. 2. Also, with MOSFET, You can extend the Cascade of MOSFETs to generate I-outs indefinitely because it is voltage device and you do not bleed the current off the I-Ref like in the case of BJT where you bleed the Ib to the cascaded BJTs down the chain and cuase error when compared to from I-Ref. Excellent Channel modualtion explanation. Instructors, textbooks and many others tend to avoid it and assume ideal due to complexity of the whole thing.

@VidhateAshok Год назад

Please add videos about small signal analysis of cascode Current mirror

@user-ik5zs5hv7q 3 года назад

Sir i request you to make video on Pmosfet current equations and conditions for all regions of operation... Its very confusing.

@ALLABOUTELECTRONICS 3 года назад

Yes, that's true. For P-type MOSFET or PMOS, the Vgs is negative. Or in other words, Vsg is positive and threshold voltage is negative. So, MOSFET will operate in the cut-off region and no channel will be formed when Vsg < |Vt| The MOSFET will operate in linear or triode region when Vsd < Vsg - |Vt| And it will operate in the saturation region when Vsd >= Vsg - |Vt| I hope it will help you in remembering the condition for each region of operation.

@uditthakur3058 Год назад

is this wilson current mirror ckt?

@ALLABOUTELECTRONICS Год назад

No, this is normal current mirror circuit.

@jjww2788 3 года назад

the MOSFET you are using is PMOS right? so the current direction in the MOS is opposite with the reference current?

@ALLABOUTELECTRONICS 3 года назад

Would you please mention the timestamp where you are referring ??

@jjww2788 3 года назад

@@ALLABOUTELECTRONICS oh sorry, around 3 mins

@jjww2788 3 года назад

@@ALLABOUTELECTRONICS I am kinda confused with nmos and pmos, they have many different types of diagram, I don’t know how to tell them

@ALLABOUTELECTRONICS 3 года назад

@@jjww2788 It is nmos. If you are confused about symbols then in one of the earlier videos on MOSFET, I have already explained that. For info, you may refer to the JFET and MOSFET playlist. Here is the link: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ae8L9-WOiVE.html Please refer to this video. ( around 16 min it has been discussed).

@jjww2788 3 года назад

@@ALLABOUTELECTRONICS Thank you very much!!!!!!! Your courses are very helpful!

@hydrodynamics6038 2 года назад

3:15 Anyone can explain to me what actually "Diode connected transistor" and why VD=VG => VDS>=VGS- VT (I think if VD=VG => VDS

@ALLABOUTELECTRONICS 2 года назад

when Vd = Vg, Vd - Vs = Vg - Vs, right !! That means Vds = Vgs. Therefore, Vgs - Vt will be less than Vds or in other words, Vds > = Vgs - Vt. I hope, it will clear your doubt.

@abhishekpilla8857 3 года назад

At 3:25 actually if Vd= Vs then vds should be less than vgs-vt and it should operate in triode region or something....but you said Vds> Vgs-Vt ...how is that possible?? Is that some kinda property of the mirror current circuit??

@ALLABOUTELECTRONICS 3 года назад

If you closely observe, it is Vd = Vg since gate and drain terminals are connected together.

@abhishekpilla8857 3 года назад

@@ALLABOUTELECTRONICS sorry yeah I wrote it wrong but what I meant was Vd=Vg...then The condition Vds> Vgs-Vt doesn't hold anymore...thus not in saturation ???

@ALLABOUTELECTRONICS 3 года назад

Just subtract Vs on both sides. That means when Vd = Vg, Vds = Vgs. Therefore, Vds will be always greater than Vgs - Vt, isn't it ?? Therefore, MOSFET will be in saturation. I hope it will clear your doubt