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
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
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.
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.
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.
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.
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 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 ???
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
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.
@@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: th-cam.com/video/Ae8L9-WOiVE/w-d-xo.html Please refer to this video. ( around 16 min it has been discussed).
![HIWWHEE | OHM [Official MV]](http://i.ytimg.com/vi/OJJLtTLqLag/mqdefault.jpg)
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
Superb, better explanation than university profs.
PLEASE CONTINUE POSTS LIKE THIS, VERY HELPFUL 👍
Great Sir
Lucidly explained ;so perspicuous in presentation.
Long live!!!!
this video saves my life. you teach much better than my professor
Amazing explanation, so clear and intuitive, thank you so much!
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
What a great explication !!!
Thanks a lot
This is what internet is for!!! Thanks a lot
Thanks, yes please explain the cascode current mirror as an active load
Best explanation 👌🏻👍🏻
Informative. Great explanation!
Very Very informative..
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.
I love your videos. Can you also discuss Mosfet H Bridge design. and in the future also have a series on IGBTs. Thank you.
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.
Really helpful, thanks.
This is fantastic
Nice explanation.
Superb explanation
Much appreciated 😊
Thanks a lot, very useful video
I am big fan of your voice😁
Please add videos about small signal analysis of cascode Current mirror
Do you have any playlists or videos about frequency response of the amplifier
No, it is yet to be covered on the channel. Soon, it will also be covered.
ya appreciate it！
At 8:43 can you please say how did you arrive at the equation please?
Thanks man❤❤
Hi 😂
Thank you teacher
Thanks! Why after donation ,I can't donate again on this video
Thank you very much for the donation. I really appreciate that. I do not know about that. I will ask the team TH-cam for that.
one doubt though, we should also include if channel length modulation for ref MOSFET too. right?
Yeah make video on cascode current mirror 😊
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.
I still confused why the equation of ID doesn't include the channel length modulation? When should include it or when could ignore it?
Sir i request you to make video on Pmosfet current equations and conditions for all regions of operation... Its very confusing.
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.
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??
If you closely observe, it is Vd = Vg since gate and drain terminals are connected together.
@@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 ???
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
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
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.
the MOSFET you are using is PMOS right? so the current direction in the MOS is opposite with the reference current?
Would you please mention the timestamp where you are referring ??
@@ALLABOUTELECTRONICS oh sorry, around 3 mins
@@ALLABOUTELECTRONICS I am kinda confused with nmos and pmos, they have many different types of diagram, I don’t know how to tell them
@@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: th-cam.com/video/Ae8L9-WOiVE/w-d-xo.html
Please refer to this video. ( around 16 min it has been discussed).
@@ALLABOUTELECTRONICS Thank you very much!!!!!!! Your courses are very helpful!
bassing voltage?! Baas curnt?!
is this wilson current mirror ckt?
No, this is normal current mirror circuit.
what language is this ?
I want to speak ababic language pliz
You need to improve the flow of your English. There doesn't need to be a pause in between every article/demonstrative pronoun and noun.
Please change the music which appears at the beginning of each video. It is really annoying.
U can skip that if you don't like it
horrible
I don't understand your English... sorry....
Please use the subtitles. It might help you.
Please make video on cascode current mirror
It's already covered. Please check this video :
th-cam.com/video/x9xt9ChSiow/w-d-xo.html