Razavi Electronics 1, Lec 17, Bipolar Small-Signal Model, Early Effect

[@TheAInfinity]

Professor Behzad Razavi, you are a genius. Thank you for making these videos. We love your lectures so much. Salam from Iraq.

[@nth282]

1w4yi

[@nth282]

1rhviz

[@foroogh4929]

Dear Professor Iran is proud to have children like you.

[@nisargkhajanchi8853]

Professor Razavi, your lectures are blessing for electronics engineers. Love you.

[@muhammadalitehseen7181]

Greatest Teacher ever

[@amithmgrhs6367]

I don't have words to thank you sir , wish I had the opportunity to listen live lectures. Love you sir

[@rishabhshukla287]

One of the Best Professor for Analog VLSI....

[@DeltaSigma16]

Yes

[@abdxlive]

Love From AMU ❤️

[@neerajhebbar7313]

We Love you Behzad Sir I wish God gives you a Life full of happiness Love from INDIA

[@zeta4687]

thank you so much now i finally understand what early effect works

[@icesnk]

Best professor ever!

[@theminertom11551]

I have never seen lectures concerning active circuits that were as good as these. I remember that 40 years ago when I first encountered active circuits for my E.E. I felt, and still feel, that my professor at the time, rest his soul, did not know an active circuit from a hole in the ground. Lots of hand waving with little understanding.

[@ajitsinghsingathia7519]

very nice lectures Sir.These have been very helpful to me concept wise keeping me confident in concepts in Electronics circuits. Thank you Sir. Love from all my friends and me for these wonderful lectures

[@noelmanase4692]

amazing lectures

[@Peter_1986]

The book "Microelectronic Circuits" by Sedra & Smith uses pretty cool conventions for different types of quantities - for example, in terms of currents, it uses the format i_C for total instantaneous currents, I_C for direct current, I_c for sinusoidal amplitudes, and i_c for small incremental currents. I highly recommend these notations.

[@blankspace1959]

are you being sarcastic? they are all the same or really hard to tell apart

[@KrishnaDN]

great... I really want to become a teacher like you:)

[@raghavendrams5626]

Thanks Sir from INDIA

[@Peter_1986]

I would actually recommend the _T-model_ for circuits that have a resistor in the emitter branch. That model is much more convenient for those kinds of circuits, since it allows you to add resistors in the emitter branch together.

[@assemhamdy4806]

where can i get circuit theory | & circuit theory || lectures

[@mnada72]

if you got the link please post it here

[@ahmednesartahsinchoudhury2628]

His Microelectronics book covers materials in a similar order.

[@lattehour]

that r pi resistance in the model is strange it`s equal with beta times the dynamic resistance of the base emitter pn junction ==> B ( Vt/Icq) also known as the input resistance in some other books , who comes up with this names .....

[@Upgradezz]

Ronaldo of electronics!

[@muhammadhayat6350]

love it

[@ArpitDhamija]

in last question , as Vce increases , x decreases => slope decreases => then diffusion current decreases but you said that , diffusion current increases , why ???????

[@02585975]

I have same question, said that the second one had a sharper slope???????????????????

[@sabasharikadze4457]

Hello. Yes, with higher Vce depletion width penetrates deeper into the base, so the total nondepleted P base region becomes narrower. Since you inject the same amount of electrons from the emitter (constant Vbe), starting minority electron concentration in base is the same (independent of Vce) but has to become zero across smaller P region, therefore concentration slope has increased.

[@anupammathur17]

@@02585975 Yes, it should have been the first case for the sharper slope.

[@cantfindagoodchannelname7359]

@@02585975 the diagram is wrong thats all explanation is crct

[@jbkrobin]

Ok this quiz was easy finally

[@boraozturk3634]

the mikes

[@chang-seopyuk3785]

why we replace the constant voltages to short circuit in small signal model? little confused:(

[@MariaSantana-jv6tw]

he said because batteries are constant voltages and for small signals we are only looking at perturbations/signals. A battery does not have any perturbations or signals because it stays constant.

[@rishabhshukla287]

Beacuse in small signal analysis we focused on excitation which are time varying (A.C.) while Constant voltage doesn't have such variation ( idle case, neglecting negligibly small Ripples)

[@NaaJeevitham500]

what are small signal models for capacitor and inductor?

[@schnecke1061]

I think inductors and capacitors in small signal analysis are assumed to always have zero impedance at the frequency of interest, so they are getting just like the voltage sources replaced with a short to ground

[@yezhao26]

I think small signal only makes sense for non-linear component. Since capacitor and inductor are linear component but with di/dt or dv/dt terms, it is better to treat them in s-domain and the algebra becomes much easier than time domain

[@wagsman9999]

I keep typing brilliant

[@hamzakyamanywa9792]

some 5 people disliked this video ahahahaha

[@beaman6909]

Really , Your the fucking Teacher....... HELL good teaching sir..... i really wanted you to be my teacher......... sorry ....for the first phrase.....but ....YOUR AMAZING...... I'M sharing every lecture to my friends