Razavi Electronics 1, Lec 42, Op Amp Circuits 1

[@inspectormag]

As an Iranian engineer, I am so proud of you! Professor Razavi! I found your name in a reference and searched you then and found you are a great Iranian-American professor and you have many lectures here. I am not electronic engineer but being an electronic engineer was my dream from a long time ago when I was a teen and used to make some electronic boards or repair some stuffs and now I am very interested to learn and study by myself. Thanks for your great work to students! stay healthy!

[@karamany9870]

Iranian EE are great. Check out Ali Hajmiri

[@Aman-xi7eo]

@@karamany9870 can you please tell us about more good lectures in the domain of digital circuits, communication signals

[@mohitupadhyay4866]

such a good effort to spread knowledge and that also free of cost. Real knowledge make people good inside-out. thanks from INDIA

[@Upgradezz]

Indeed buddy

[@aamirm]

As a teenager, I played with electronics, built simple transistor amplifiers, used to draw PCBs on paper and simplify to understand better, repaired CFL ballasts. Despite my interest in electronics, I couldn't enroll into electronics degree course. But watching your lectures, my interest in electronics have rekindled. Have watched 40 lectures of your course 1. You have simplified concepts and calculation to the extent I couldn't imagine. Thank You Dr Razavi for your awesome lectures! May Allah SWT bless you in every respect for imparting invaluable knowledge and experience you have

[@Z-eng0]

I have to admit when my friends told about this playlist in my first semester as an electronics engineering student I was a bit skeptical since I didn't put much thought to it and the time of each lecture was about an hour, but now that I've seen this video ,and it REALLY gave me knowledge when I didn't have a clue about op amps, I'm thinking of revisiting the whole playlist in my semester vacation, sincere thanks from Egypt professor

[@1973jdmc]

You sir deserve a medal. Heart felt THANK YOU for an OUTSTANDING LECTURE- I salute you.

[@suryamohan8678]

you are the god of electronics.i have never seen anyone who has this much clarity about analog circuits.thank you so much sir.

[@maximecholvy2813]

Great explanations, once again. You care about leaving nothing that could be misunderstood. That's very appreciable.

[@manishsolanki3497]

Best Analog electronics lectures I have seen

[@jeroenxie9047]

Professor, you are my savior!

[@imankian]

This is great! We're waiting for the next series!!!!!!

[@Millers1231]

Razavi is the one true saviour

[@rajivdey3103]

Respected sir, you are great I think I have not seen anybody in this world who teaches like you hates off

[@khuongtranminh4104]

What an incredible explanation! Thank you, sir!

[@SudhanshuChoudhary1]

Excellent! Thanks! Please load more series from the Master.

[@abdxlive]

Thanks Razavi Sir ✨

[@arjunp7527]

Thank You Prof Razavi for the wonderful lecture

[@Halowajan]

Sir your teaching is awesome...I m enjoying it.. thanks..

[@behzadjabbari6627]

Excellent.

[@賴君皓]

Helped a lot, thank you professor

[@nomqn1861]

at 52:28, the gain of this CS stage is directly used to derive the open-loop gain, but isn't the gain of CS stage only valid with a small signal? with this Vout swinging, it is more close to determining the quiescent operating point of the CS stage in my mind. So why shouldn't we concerned about the validaty of using this small-signal gain in "big" signal analysis?

[@psrikrishnareddy1081]

excellent work sir... Waiting for more videos on Analog circuits

[@youcefaitamrane4074]

Dear Mr Razavi. I'm very greatful to you for the lectures you are providing on KZbin. Excellent pedagogy ! Do you give lectures on Communication ? Kind Regards Youcef

[@habtamusium8646]

nice presentation ! quit understandable thanks!

[@karenwood1037]

Just a BIG thanks....😀😄😄😁👍

[@abhinavsingh5873]

sir, i am eagerly waiting for next series, please make it sir.

[@MrVasugupta]

When is the next series of videos coming?

[@Upgradezz]

Ma Foi! Excellante!

[@nikhilzawar2746]

at 28:57 seconds - why did you put a positive sign at the ground terminal in the op amp and a negetive sign on the other input terminal of the op amp?????

[@sushmanv8052]

Super lecturer 🙏

[@divyanshuvadehra3779]

Why didnt that op amp given in the quiz not saturate despite being connected in positive feedback?

[@souravsen2981]

It didnt saturate because the output of the CS amplifier is itself negative so that makes the system a negative feedback system, however if the output had been connected with the -ve terminal of the opamp, the negative signal from the CS coming as a feedback would again change its polarity to positive and that's what my friend! would make the system unstable.

[@swaritmahalsekar5521]

Hello sir in quiz at 51:00, you connected mosfet to positive terminal which indicates a positive feedback so the concept of virtual short may not work i.e. Volt at inv terminal won’t be same as non inverting terminal and opamp operates in saturation region right?

[@黄河黄]

The last equation of inverting op with A0 not very large, the voltage gain = -1/(R1/R2+(R1+R2)/A0*R2), is that right?

[@vprakash2471]

Yeah bro that's what i too got

[@Peter_1986]

Yes. However, I personally prefer to write that equation as "voltage gain = -A0*R2 / (A0*R1 + R1 + R2).

[@anupammathur17]

yes you're correct!

[@gevorggeghamyan1718]

You're the best

[@akshatavdaggi2350]

Excellent ..Thanks sir

[@richardgray8593]

Who teaches electronics better than Dr. Razavi? Nobody, that's who.

[@toddmoore112]

why doesnt current through R2 enter opamp because output impedance of opamp is 0 ?

[@ndilipkumar4159]

sir please please do more video on feedback concept and circuit teory

[@dushyantbansod2025]

I need the same quality lectures for Network analysis, please suggest if anybody knws

[@kavyashree8572]

You can refer Nagendra krishnapura IITM nptel lecture series or NESO academy.

[@dushyantbansod2025]

@@kavyashree8572 thank you so much

[@socialogic9777]

I'm referring to Prof. SC dutta roy IITD

[@socialogic9777]

@@kavyashree8572 hey are you also doing Internet of things specialization from UC Irvine at coursera

[@Z-eng0]

Question : when we worked on case 2 of the inverting op amp why did we say the current only goes across R2 even though Ao isn't infinite, did we assume Rin is still infinite ?

[@souravsen2981]

Yes, generally for any practical opamps also the argument of Rin being very large holds good.

[@adityatripathi02]

The inverting and non inverting input terminals of the opamp are generally MOSFET gates which have an infinite impedance which is why all the current from R1 can only pass through R2. This should hold true regardless of Ao being infinite or not.

[@4everlovedan90]

so cool

[@sanjayparelkar3912]

Hi Iam not able to listen. No audio.

[@sanjayparelkar3912]

Got it thanks

[@zihadislam8694]

how does the equation of the non inverting op amp when the gain is not high form? Vout/Vin= Ao/(1+R2/R1+R2* Ao). anyone can explain where from do it come/

[@kramer3d]

Use Vout = Ao (V+ - V-). V+ = Vin. V- = Vout *R2/(R1+R2) (from voltage divider at node X). Then just solve for Vout/Vin

[@zihadislam8694]

kramer3d thank u so much

[@nagireddymallikarjunareddy9624]

I need same quality of lectures for converters (ADC& DAC )..if anyone knows pls suggest me ..

[@a.meenakumari4174]

U can refer IITM nptel videos

[@tharun541]

He has written a book on data converters. PDF is available in internet.

[@nothingprajwal-ul2mz]

40:22

[@nithinsai2250]

53:00

[@ece-br2ko]

fine

[@anuzravat]

haha long kong 2 plate momos

[@az-op8oc]

Your video resolution is poor how to enable adobe flash player

[@hollythejcs]

OMG, this video has no dislikes That’s rare

[@nurelaylanishatezahan4398]

I wish nobody knows the name razavi