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

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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[@v.prasath3130]

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]

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]

@@ALLABOUTELECTRONICS tq 👍

[@reubenwilliammpembe667]

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[@ALLABOUTELECTRONICS]

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]

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

[@hitman2754]

Sir what is dc offset?

[@vinaykumarkajana7881]

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]

Sir I have a question can you answer it please

[@mohamednuskhan7526]

Your information is very useful.thank you

[@akshayasubramanian4311]

Excellent series! Thank you so much!!

[@Samsque90]

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

[@omidabed7764]

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[@alishakatyayani7910]

this series is really good

[@abdelrahmanhabib5991]

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]

nvm i realized it was an assumption that he made

[@dakshitaakarthi2477]

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

[@lakshmidaravathu4779]

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[@ElectricalEngineeringApp]

very good video sir thanks

[@mayurshah9131]

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[@slheisa8418]

This was very helpfull.Thank you

[@nekodasaunders9190]

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]

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

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[@VijendraSingh-bp3sf]

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[@sujeetrockson9285]

Good video dear

[@samrawitlegesse6687]

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]

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.

[@mainakpradhan6175]

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

[@swethachiliveri853]

One doubt: Why did we not consider the concept of virtual ground in case of non-inverting summing amplifier? Thank you for your lectures.

[@ALLABOUTELECTRONICS]

It has been considered. And based on that only, we got Vo = (1 + Rf/ Ra) *V+ . Once, we got V+ using the superposition theorem, then using the concept of virtual ground only, we got Vo = (1 + Rf/ Ra)*V+. In the earlier video of non-inverting op-amp, since I have already covered it, so here I have directly used the expression. For more info, you can check that video. kzbin.info/www/bejne/q6qyl6Kkh8Sle9ksi=ichrOUKxnM8PcJ-y

[@shiblnasser7151]

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[@bijum2086]

really helped me

[@aryantewari]

thank u sir

[@bhageshmaheshwari2807]

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]

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.

[@flobbie87]

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

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

[@aasheervadsharma1016]

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]

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

[@aasheervadsharma1016]

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]

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.

[@davidnkohoz6579]

Respect sir

[@muzammilrizvi6424]

Amazing 😍

[@akshithapandya1918]

Amazing, good explanation 😊 Tq for helping in this 😀

[@debaprasadadash4824]

Actually it is easy to understood a student.

[@anya7094]

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

[@vathsalmehta3488]

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]

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]

@@ALLABOUTELECTRONICS Thank you this was helpful

[@arijeetroy8747]

@@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 ?

[@devil-23]

Thankyou

[@sricharandonkada6611]

Thanks a lot bro!

[@qadirraza394]

Great thanks

[@wasimmondal3860]

Awesome....

[@user-bz7ki7dl1r]

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

[@younis-jw8sw]

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

[@ALLABOUTELECTRONICS]

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.

[@happylifehappywork7543]

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

[@-MDRaselMia]

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

[@justchill4873]

Can u put videos about regulated power supply sir..plzzzz

[@ALLABOUTELECTRONICS]

I have already made a video on it. Please go through op-amp as voltage regulator video.

[@justchill4873]

@@ALLABOUTELECTRONICS thank u sir

[@deepakdaswani7929]

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

[@mdabdulmoin8298]

thank you

[@rk5759]

For God's sake change the intro music else you are doing a good job

[@abhisheksingh-pv3gm]

Sir Which software u r using for making videos.

[@praveenm5278]

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]

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

[@praveenm5278]

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

[@Karan_Adhikari]

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

[@ALLABOUTELECTRONICS]

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

[@MrXinchuan]

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]

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.

[@Aditya-kumar-129]

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

[@ALLABOUTELECTRONICS]

Please check the video on op-amp as a differential amplifier. Here is the link : kzbin.info/www/bejne/oqW5pKOLqcqoq6s

[@bibeksaha5204]

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?

[@ajaysauravminhas1191]

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

[@mdshadab9170]

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

[@isoentro10]

Awesome

[@harun-or-rashid8714]

Sir, Please make a video on linear digital IC.

[@ALLABOUTELECTRONICS]

Soon I will make it.

[@technovisionpk6974]

where and why we use summing inverting/non inverting amplifier

[@md.hafizsikder4152]

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.....

[@ishaankalal8907]

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

[@sayandey7956]

Please send some important question from this op amp

[@ALLABOUTELECTRONICS]

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: kzbin.info/www/bejne/jJWzZKeKmMaNf8U

[@tamannasharma1568]

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]

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.

[@tamannasharma1568]

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

[@rectifiedrandomness863]

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

[@thusharanup4906]

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]

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.

[@basilbenedictvictor2053]

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

[@ALLABOUTELECTRONICS]

Yes, it does.

[@rohitgarg1814]

Ans is 4V......if wrong then plzzz tell write ans...

[@bluecrystal5636]

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