Op-Amp: Summing Amplifier (Inverting and Non-Inverting Summing Amplifiers)

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In this video, the inverting and the non-inverting summing amplifiers using op-amp has been discussed along with the derivations.
In this video, it has been discussed that how by applying multiple inputs to either inverting or the non-inverting input terminal of the op-amp, it can be used as summing amplifier (as adder circuit)
Inverting Summing Amplifier:
In this configuration, the inputs are applied at the inserting end of the op-amp.
The advantage of this configuration is that each individual inputs are isolated with respect to each other and there is no interference or cross-talk between the different input voltages. (because of virtual ground)
However, the output voltage is inverted with respect to input voltage. And it can be further inverted by using one more inverting op-amp with unity gain at the output of the summing amplifier.
In most of the practical applications, this inverting summing op-amp is used.
Non-Inverting Summing Amplifier:
In this configuration, the inputs are applied at the non-inverting end of the op-amp.
In this configuration, the calculation of the output voltage is getting complicated as the number of inputs increases. Moreover, there is cross-talk between the different inputs. (Inputs are not isolated with each other)
In non-inverting summing amplifier, the output voltage is in phase with the input voltage.
Application of Summing Amplifier:
1) As voltage adder, scaling, averaging circuit
2) To provide the DC offset to the input signal
3) Digital to Analog Converter (DAC)
4) Audio Mixer
The timestamps for the different topics is given below:
0:51 Inverting Summing Amplifier
4:48 Scaling and Addition using Summing Amplifier
5:29 Averaging operation using Summing Amplifier
6:40 Application of summing Amplifier
9:26 Non-Inverting Summing Amplifier (with two inputs)
12:51 Non-Inverting Summing Amplifier (with three inputs)
The link to the related videos on the op-amp:
Introduction to Operational Amplifier:
• Introduction to Operat...
Inverting Op-Amp:
• Operational Amplifier:...
Non-Inverting Op-Amp:
• Operational Amplifier:...
This video will be helpful to all the students of science and engineering in understanding the inverting and non-inverting summing amplifier.
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15 дек 2017

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Комментарии : 265

@poojashah6183 6 лет назад

This op-amp series is incredibly good 👌👌

@dolonghanty3854 6 лет назад

App feedback or integrater kha se pare ho

@roxinnjeru5837 6 лет назад

i'm very grateful for your videos about op-amps .i'm using them to revise for my exams coz i do my bachelors in chinese and sometimes i don't understand in class but now i'm understanding everything through this video.

@ALLABOUTELECTRONICS 6 лет назад

The timestamps for the different topics covered in the video is given below: 0:51 Inverting Summing Amplifier 4:48 Scaling and Addition using Summing Amplifier 5:29 Averaging operation using Summing Amplifier 6:40 Application of summing Amplifier 9:26 Non-Inverting Summing Amplifier (with two inputs) 12:51 Non-Inverting Summing Amplifier (with three inputs)

@gangadharbhuvan9137 5 лет назад

Sir why don't u make videos of op amps circuits experiments

@hitman2754 5 лет назад

Sir what is dc offset?

@vinaykumarkajana7881 5 лет назад

The explanation of non inverting summing amplifier is not understanding well as that of inverting summing amplifier they both didn't go in the same way as that of inverting and non inverting op amp

@velatciftci1628 4 года назад

Sir I have a question can you answer it please

@mohamednuskhan7526 3 года назад

Your information is very useful.thank you

@chamed5277 4 года назад

This illustration of Amplifiers is outstanding. Well done! Thanks you so much!

@charleselliott4943 Месяц назад

nice, simple, clean explanation. this guy is in a small group of people who know how to make difficult things easy to understand. thank you.

@pallavijadhav9231 5 лет назад

This op-amp series is really good overall 👍👍

@egesaroglu 6 лет назад

Man thank you so much for preparing and sharing these videos! I am an undergraduate student as a mechanical engineer and I am studying for my final exam by your videos!

@mahekvanjani1561 Год назад

@Skystrike70 5 лет назад

Well done, came for quick study help and got what I needed in the first 5 minutes.

@bonitalexie3637 7 месяцев назад

Preparing for my final exam. Your videos really save me! Thank you for your work!

@noweare1 6 лет назад

So glad I found your channel. Much better than going to school. I don't even have to raise my hand.

@livelovelife777 6 лет назад

wow..a very nice explanation with so much of clarity...😍👌👏

@naturesaver7895 3 года назад

Sir,thanks for video on electronic,before I had little confusion in learning electronic devices. But now it is clear with ur video ...l will watch all of ur videos sir .

@vinaychourasia652 6 лет назад

Very helpful and zero confusion concept... So very thanks

@nayanjadhav2334 5 лет назад

Thank you all about electronic you are favorite teacher . Thank you Thank you so much 😌

@imadyoucef2692 Год назад

Your explanation is incredibly perfect Sir, thank u

@RohitSingh-hc8yi 2 года назад

U bring conceptual clarity to me thanks a lot

@poojap9590 3 года назад

thanks a lot, was slogging the whole semester in this chapter, thank you so much for making it so simple🙏🙏, hope to watch many more topics like these 👍

@akshayasubramanian4311 4 года назад

Excellent series! Thank you so much!!

@balapranav7096 3 года назад

Thank you so much, sir! You taught in a way no one could, and as the same student who slept when my professor handled this, loved listening to your teaching with great attentiveness... You made this more interesting, while our sir made it look cumbersome

@lokendrasinghlodhi718 Год назад

Thank You So Much Sir For this effort to help all of us !

@omidabed7764 5 лет назад

Amazing, useful. ... Thank you for sharing

@poojashah6183 Месяц назад

Amazing, all doubts cleared, thank you so much 🙏🏻

@reubenwilliammpembe667 5 лет назад

you are the best Sir!!!

@flobbie87 2 года назад

Is there anything harder than making sure that two resistors have the same resistance?

@slheisa8418 5 лет назад

This was very helpfull.Thank you

@dakshitaakarthi2477 2 года назад

Great video 👌! It would be helpful if u could share the ppts/slides that u had used in the video.

@tpsicmin 2 года назад

Amazing Explantion Thank you Sir

@Samsque90 6 лет назад

I'm wondering which software do you use to make such a wonderful video?

@AKASH-sw9bs 2 года назад

thanks sir . you helped me understand a tough topic and i helped you by disabling adblocker🎃♨️. as usual i use ad blocker but when i watch any educational video i turn it of and reload the site so that the ads can run . though it might seem funny but if everyone would do in such a way that it could result in a beautiful amount 🖤❤️❤️

@apostolosmavropoulos177 5 лет назад

TOP CONTENT.. You deserve more subs

@lakshmidaravathu4779 2 года назад

Thank you so much sir.. Amazing explanation. It's really superb..

@v.prasath3130 5 лет назад

This opamp series in incredible! Deep and lucid style of explanation makes us to understand concepts in much simpler way! One doubt from above video, sir you have said individual voltages we apply in inverting summer will be separated due to virtual ground and effective input impedance will be the R1. What will happen if all three voltages are given at a time? Pl can u elaborate on how each sources acts separate and input impedance doest not change after adding multiple resistance on input side? Thank you

@ALLABOUTELECTRONICS 5 лет назад

Actually, all the sources are applied simultaneously. But for the analysis, we are applying the superposition theorem. When you consider one source at a time, then the remaining source will be zero. And if you look the circuit, due to virtual ground both terminals of the resistors will be at ground potential. So, it won't affect the impedance of the circuit. I hope it will clear your doubt.

@v.prasath3130 5 лет назад

@@ALLABOUTELECTRONICS tq 👍

@mdshadab9170 4 года назад

sir,how did you put superposition throrem while discussing about non inverting op amp. I am finding difficulty understanding it, plz help.

@chandsureja6582 5 лет назад

nice content sir keep up the good work sir

@mayurshah9131 6 лет назад

Really very informative

@deepakdaswani7929 5 лет назад

Sir can we Rf equals to 0 in non inverting summing amplifier so it can act as average amlifier ?

@user-bz7ki7dl1r 3 года назад

Thank you very much for sharing this video. I have a question: how to do input bias current compensation then in the summing circuits?

@anya7094 3 года назад

Can anyone please tell me what is meant by providing dc offset to the input signal?

@LI-hz2me 4 года назад

sososo helpful! thank you so much!

@rakeshgehlot9590 5 лет назад

Wonderful guru ji

@likeshareandsubscribe7536 4 года назад

Sir kindly tell me which you follow for making youtube lectures.

@bluecrystal5636 2 года назад

How can we get v0 in inverting summing amplifier with superposition theorem

@RohitRai-vz2vn 5 лет назад

U are legend what a content

@abhisheksingh-pv3gm 5 лет назад

Sir Which software u r using for making videos.

@happylifehappywork7543 Год назад

different input voltage with different resistors value. which formula we will use?

@shivanirajpurohit4307 2 года назад

op brooo🔥🔥🔥🔥 it help mee a lott thank u bhayya😍😍😍😍

@ramilawijesuriya7259 2 года назад

Excellent video ! Thanks

@shreeshkulkarni3657 2 года назад

You are the GOAT bruh

@VijendraSingh-bp3sf 5 лет назад

Superb explained 🏆🏆

@mainakpradhan6175 4 года назад

And sir also plz upload some videos on working procedure of filter circuits(i mean how the charging discharging of capacitor, inductor helps in smoothing the ripple )....plz sir upload some videos on these, plz sir, please

@alishakatyayani7910 5 лет назад

this series is really good

@abdelrahmanhabib5991 5 лет назад

Hey since you just commented like 5 days ago could you please explain to me why at 6:00 Rf/R=1/n ? I can't seem to be able to understand why

@abdelrahmanhabib5991 5 лет назад

nvm i realized it was an assumption that he made

@nekodasaunders9190 6 лет назад

Your videos are really good especially this op amp series..but at times I get trouble understanding what you say..can you add subtitles?

@nekodasaunders9190 6 лет назад

Oh don't bother.. I opened it on my laptop and there are subtitle..my bad🤦🏾‍♀️

@shiblnasser7151 5 лет назад

U r awzm great explanation

@ishaankalal8907 5 месяцев назад

00:19 Learn how to use op-amp as summing amplifier 02:14 Op-amp can be used as an inverting summing amplifier 04:48 Inverting summing amplifier can perform addition, scaling, and averaging operations. 06:58 Inverting summing amplifier has multiple applications 08:56 Inverting and non-inverting summing amplifiers 10:44 Non-inverting summing amplifier can perform addition of voltages 12:56 Non-inverting configuration with multiple input voltages 14:57 Inverting and non-inverting summing amplifiers

@bhageshmaheshwari2807 3 года назад

Nice video again. Can you please elaborate why there would be cross talk between inputs in non-inverting config but not in inverting one ? Thanks.

@ALLABOUTELECTRONICS 3 года назад

In case of the inverting configuration, due to virtual ground, one end of the resistors is connected to the ground. When we consider one source at a time and consider all other sources as zero, (to find the output), then both ends of resistors (For those input signals which are considered as zero) will be at the ground. So, effectively there is no impact of those voltage sources on the output. But that is not the case in the non-inverting configuration as I mentioned at 16:22. I hope it will clear your doubt. If you still have any doubt then let me know here.

@ajaysauravminhas1191 Год назад

Please anyone tell me that how these voltages got calculated with resistance ....and which formula used here .

@basilbenedictvictor2053 6 лет назад

Does this also follow the same concept of biasing voltage as shown in the differential amplifier

@ALLABOUTELECTRONICS 6 лет назад

Yes, it does.

@adhithyan9444 3 года назад

you are really great.

@bijum2086 6 лет назад

really helped me

@samrawitlegesse6687 2 года назад

Thank you sir nice and clear explanation. But my question is When we about the advantage of non inverting in the previous video, infinite input impedance was one advantage right? So why do we put R1,R2 and R3?

@ALLABOUTELECTRONICS 2 года назад

Without the resistors R1, R2 and R3, if you directly connect the three voltages at the non-inverting terminal then it will violate the KVL. Basically, you are connecting three different voltages at the same node. But with resistors, because of the drop across it, it won't happen. And you can find the effective voltage at V+ using the superposition theorem. I hope, it will clear your doubt.

@swapnilbhoite902 6 лет назад

Good work!!!

@ElectricalEngineeringApp Год назад

very good video sir thanks

@waelsadek81 5 лет назад

Very good videos 👌

@debaprasadadash4824 4 года назад

Actually it is easy to understood a student.

@divyangthakkar1074 6 лет назад

What happens when multiple inputs are applied to the inverting and non-inverting sides together?

@ALLABOUTELECTRONICS 6 лет назад

In that case, op-amp can be used as differential amplifier/difference amplifier. It is also known as the subtractor circuit.

@VijendraSingh-bp3sf 5 лет назад

Keep going 🏆🏆🏆🎖️

@thusharanup4906 2 года назад

what if there is a voltage source on the other terminal? e.g non inverting amplifier has a voltage source in the inverting terminal or vice cersa?

@ALLABOUTELECTRONICS 2 года назад

I think you are talking about the difference amplifier where there is a voltage source on both positive and negative terminals, isn't it? There is a separate video for that. Please check it.

@rhp1234 3 года назад

Sir, keep it up👆👍👍

@younis-jw8sw 5 лет назад

The 741 ic connected as a non inverting amplifier for a gain of 100. Determine the stability of the amplifier at this gain

@ALLABOUTELECTRONICS 5 лет назад

well, actually it depends, what is the input signal frequency, and what is the input voltage. Because when op-amp is used with negative feedback, then stability is a function of frequency. For, small DC voltage (in mV), the output will be stable. With the gain of 100, it will be in Volts. But let's say, if you apply an input voltage of 10V, in that case, you won't get 1000V at the output. Rather output gets saturated at the Vsat voltage. For +15V supply, possibly you would get around 12-13V at the output.

@vathsalmehta3488 4 года назад

My question is why voltage division took place only on the non inverting configuration when we employed superposition theorem what if we employed superposition theorem in the inverting config will voltage division among resistors will take place or not?

@ALLABOUTELECTRONICS 4 года назад

In the case of the inverting configuration, if you apply the superposition theorem, then only once source will be active at a time. For example, V1 is active and V2 and V3 is zero. That means one end of the resistor R2 and R3 will be at ground potential. Also, due to the virtual ground, other terminals will be grounded. That means both terminals of R2 and R3 will be at ground potential. And they will act it as if they are not the part of the circuit. So, there is no point of applying the voltage divider rule. I hope it will clear your doubt.

@vathsalmehta3488 4 года назад

@@ALLABOUTELECTRONICS Thank you this was helpful

@arijeetroy8747 4 года назад

@@ALLABOUTELECTRONICS sir in non inverting we can also do the same thing , active only one source and rest of two source will be grounded then how we can apply superposition theorem , and in the non inverting summing amplifier you are also doing the same thing, grounding V2 , calculating V1 . please clear my doubt ?

@jblife123 5 лет назад

Sir at 9:22 for the unity gain amplifier the signal should be applied to the positive terminal.. isn't it?

@ALLABOUTELECTRONICS 5 лет назад

I was referring about the magnitude of the gain. Its actual gain would be -1 (The second amplifier stage). But because of that overall gain of the two stages will be positive.

@aasheervadsharma1016 5 лет назад

Thanks for the videos really it was nice Sir plz tell what if we apply different signals at both the terminals of a summing Op-amp

@ALLABOUTELECTRONICS 5 лет назад

Hi, you mean to say, if Vin1 and Vin 2 are different then what would be the output?

@aasheervadsharma1016 5 лет назад

Hello My question is that in a single opamp if we apply some signals( like V1a, v2a, v3a etc.) on positive terminal and some signals (like v1b, v2b, v3b etc. ) on the negative terminal in that case what will be the formula for output??

@ALLABOUTELECTRONICS 5 лет назад

I have discussed that in the separate video. Please watch the video on the differential amplifier. You will get the answer. And after that still, if you have any question then do let me know here.

@sujeetrockson9285 11 месяцев назад

Good video dear

@vinaykumarkv5830 3 года назад

Very goodexplaination

@laurentiusmichaelgeorge1118 5 лет назад

Thanks!

@bibeksaha5204 3 года назад

Someone look at 13:45, why the parallel combination of R2 and R3 to be put there? Why not It's like V1*R1/{R1+(R2||R3)} Can someone clear me this?

@qadirraza394 6 лет назад

Great thanks

@tamannasharma1568 3 года назад

sir if the input impedance of an opamp is very high then there will be no flow of current so, whether the opamp circuit in off state OR NOT?

@ALLABOUTELECTRONICS 3 года назад

Actually there is a flow of little current ( in uA). But for ideal opamp it is zero. More over, through bias voltages, opamp also draws the required current for the operation. I hope it will clear your doubt.

@-MDRaselMia 4 года назад

In case of I(f) current direction will opposite as current flow higher potential to lower potential... V(out)>node potential 0

@shahzebsayyed7282 4 года назад

Thanks sir !

@tamannasharma1568 3 года назад

Sir, how the bias voltage is placed in the circuit ? And sir ,which book should i prefer to study the opamp?

@rectifiedrandomness863 2 года назад

Op Amps and linear integrated circuits .- Ramakant A Gayakwad.

@akshithapandya1918 3 года назад

Amazing, good explanation 😊 Tq for helping in this 😀

@MrXinchuan 9 месяцев назад

Can you explain in the superposition theorem, why v1+ =(R2*V1) / (R1+R2), but not v1+ =(R1*V1) / (R1+R2). I can't find any explanation about this voltage division rule.

@ALLABOUTELECTRONICS 9 месяцев назад

First, let's assume that when V1 is acting alone, then the total current in the loop is I. So, I = V1 / (R1 + R2). Now, the voltage V+ is actually a voltage drop across R2 right !! And using ohms law, we can say that, V+ = I1*R2. Now, putting the value of I, further, it can be written as V1*R2 / (R1 + R2). So, that is a voltage divider rule. In that equation, V1/ (R1 + R2) is the total current in that loop. I hope, it will clear your doubt.

@wasimmondal3860 5 лет назад

Awesome....

@sricharandonkada6611 3 года назад

Thanks a lot bro!

@mahimatolani2447 5 лет назад

Why didn't we apply concept of virtual ground in non inverting summing amplifier..it also uses negative feedback??

@ALLABOUTELECTRONICS 5 лет назад

In case of the non-inverting summing amplifier, V+ terminal is not at ground potential and same is true with inverting terminal. But because of negative feedback, there will be virtual short between inverting and non-inverting terminal (V- = V+)

@harun-or-rashid8714 6 лет назад

Sir, Please make a video on linear digital IC.

@ALLABOUTELECTRONICS 6 лет назад

Soon I will make it.

@zenvir1680 4 года назад

At 10:40 the resistance of the OP-Amp is infinite, shouldn't all the voltage V2 drop across the Op Amp itself and thus making V2+=0 ? I am confused at that exclusion of OP-amp's infinite resistance from the circuit

@zenvir1680 4 года назад

Oh!! I solved by individual currents and added them, got the same value for V2. But when we take currents in consideration we can say current will not enter Op-amp due to infinite resistance, but how do we explain the same with voltage?

@ALLABOUTELECTRONICS 4 года назад

@@zenvir1680 If there is a current flowing through any resistor, then there will be a voltage drop across that resistor. It is independent of the resistance of the op-amp. At the non-inverting terminal, the current is flowing through R1 and R2. And the voltage drop across the R1 is V2+.

@zenvir1680 4 года назад

@@ALLABOUTELECTRONICS I got that. Thank you so much.

@technovisionpk6974 5 лет назад

where and why we use summing inverting/non inverting amplifier

@md.hafizsikder4152 4 года назад

It is frequently called a signal mixer as it is used to combine audio signal from several microphones, guitars, tape recorders, etc., to provide a single output. Hope that helps. Happy Learning.....

@Karan_Adhikari 2 года назад

Sir what is the maximum output voltage produced by a summing amplifier?

@ALLABOUTELECTRONICS 2 года назад

Depends on the biasing voltage of the op-amp. The biasing voltage decides the positive and the negative saturation voltage of the op-amp.

@sateeshkumar8106 3 года назад

Which one is best inverting or non inverting amplifier?

@MihikaNarayan24 6 месяцев назад

Did you get the answer? Which one is better?

@aryantewari 4 месяца назад

thank u sir

@Aditya-kumar-129 4 года назад

I think u haven't made video on this topic "Op-amp as subtractor" Please see to it

@ALLABOUTELECTRONICS 4 года назад

Please check the video on op-amp as a differential amplifier. Here is the link : ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ltVspUteuuI.html

@samvolcom1 3 года назад

At 12:20 when you say R1=R2=R , what's R in this equation because it is not on the drawing ? Thank you!

@ALLABOUTELECTRONICS 3 года назад

What I mean to say is, if both resistors are equal then in that case, you will get (1 + Rf/ Ra) (V1 + V2)/2 R is just for representation to indicate that, the value of two resistors are equal. I hope it will clear your doubt.

@samvolcom1 3 года назад

@@ALLABOUTELECTRONICS yes thank you!

@davidnkohoz6579 3 года назад

Respect sir

@mainakpradhan6175 4 года назад

Plz give the link for the videos on network theorems

@ALLABOUTELECTRONICS 4 года назад

Please go through this playlist of network analysis. It also contains the videos on the network theorems: ru-vid.com/group/PLwjK_iyK4LLBN9RIDQfl9YB4caBYyD_uo

@epsitasahu1133 4 года назад

plz provide a video o logial gates

@sayandey7956 5 лет назад

Please send some important question from this op amp

@ALLABOUTELECTRONICS 5 лет назад

Please check the community tab section of the channel. You will find many questions related to the op-amp. Also, I have made two dedicated videos in the questions based on the op-amp. Here is the link: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VdP3tTcaZIc.html

@praveenm5278 5 лет назад

Your answer is right but we can't apply superposition theorem for bilateral circuits as we know all semiconductor devices are bilateral or non linear so prove that

@ALLABOUTELECTRONICS 5 лет назад

The op-amp is used in the linear region, so superposition theorem can be applied.

@praveenm5278 5 лет назад

I think we can't apply our sir told us proof tell me proof