Electrical Engineering: Ch 5: Operational Amp (13 of 28) Open Loop Gain vs Closed Loop Gain

In this video I will calculate the voltages of an open-loop gain vs a closed-loop gain.

Next video in this series can be seen at:

[mehdisaffar]

I have heard ilectureonline so many it times it sounds to me like welcome to electron lime

[houjamimehdi]

Just brilliant, I was always sort of confused in terms of open /closed-loop gain difference... not anymore.

[paramveersingh]

isn't the gain just A and for closed-loop gain just Rf/Ri ? What you have worked out is the output voltages no?

[lupgavgavu]

You expressed that open loop gain is Vcc. But Gain is ((+) input - (-) input)*A. I think output voltage must be -Vcc. Is it true ?

[mattkan]

thank you for your sharing, very clear and elegant.

[guhanzhang]

Just quick question, should V1 be -2 Volts? Since the positive terminal is grounded and the negative terminal has a voltage of 2 volt, so V1 = 0-2 = -2V?
Thanks a lot, the video is quite helpful tho

[wediadi]

But this must be an axception because in ideal opamp the voltage at the inverting & non inverting terminals is considered to be the same. But here while the inverting input has -2V, the non- inverting is at ground or 0V, why is this?

[debwiser]

Your lecture is soo... Clear ....that even my private tution sir can not teach me as clear as you....😎

[debwiser]

U r awsome Sirr....
I am from India....
I am become fan of u...

[agstechnicalsupport]

Good video to understand the key concepts of open loop and closed loop gain in Op-Amps.

[donaldlin]

Hi Michael, I have troubles of understanding the output voltage for open loop gain. Shouldn't V_out = A_open(V+ - V-)? I understand V- = 2V, but with that plug into the formula, should you get -4E5 V for V_out? Please let me know if I understand it incorrectly. Thank you so much!

[mbenitez]

You are so amazing! I need you for my electronics class

[sinners]

Hello Sir, I would have a question. Comparing the ideal and real op amp... we are mostly talking about open loop gain which is in ideal case infinite. I am wondering... is there any possibility, even with a closed loop to have a gain into minus infinity? How does it looks in ideal and real op amp? Or better to ask... is there any case when we have negative infinity gain? Thanks

[GabrieleVianello-xf]

It can’t be the closed loop gain That’s the ideal gain

[joanitarzzalwango]

Have gotten lost at the very beginning sir

[mattkan]

thank you for your sharing, very clear and elegant.

[lcable]

Wait. Wouldn't Vout for the open loop gain be negative since the input voltage is going into the negative terminal?

[Sujoy]

Sir, Thank you. You are awesome. And you are looking handsome. 😀😀😀😀😀. Thank you once again.

[bedirhanaksoy]

Which one is the open loop gain ? Just A or A*V1 ?

[BreakfastItem]

how do you get the open loop gain when its not given?