Square Law Modulator (Basics, Working, Block Diagram & Circuit) Explained | AM Modulator

[@EngineeringFunda]

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[@abhiramanne9649]

for anyone who wants a formal definition of sq law device A square law device produces an output voltage or current that is proportional to the square of its input voltage or current. Square law devices are mainly used in modulators and detectors. source -- topper learning.

[@beginnersplay947]

Thanks I needed that

[@-Manikumar-cg1bi]

Very good explanation sir. I just watch u r videos on 2days before examination and I passed that exam. Thank you sir👍

[@EngineeringFunda]

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[@shivamshaurya6021]

Same. I watched it 1 day before exam and got good marks. 🙏

[@easwarsendhil]

Thank you so much sir no words can express the amount of gratitude i am having towards your teaching

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[@harshithm6937]

We are blessed to have a teacher like you sir!!! ♥️

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[@harshithm6937]

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[@EngineeringFunda]

Thanks my dear

[@vishwasvishu1895]

@@EngineeringFunda All the best for your goal sir We'll support for this as you're supporting us a lot.

[@vinamrasangal8436]

@@EngineeringFunda hitesh bhai tu konsi book se padha rha hai?

[@abhijithbs997]

Beautiful and simple explanation sir. Thanks a lot!!!!!!!!

[@EngineeringFunda]

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[@vineethryala7572]

Really helpful thank you so much sir

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[@riya_1723]

Helpful video! THANK YOU SIR

[@EngineeringFunda]

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[@037priya2]

Tq sir it will very helpful sir

[@EngineeringFunda]

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[@abhiroopdas2995]

Great class...well done

[@EngineeringFunda]

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[@ruman2200]

Best teacher

[@EngineeringFunda]

Your positive comments motivates me, Thanks and welcome 🙏

[@vishwasvishu1895]

Thank you for your continued support sir.

[@EngineeringFunda]

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[@vishwasvishu1895]

@@EngineeringFunda sir can you please guide for gaining additional skills in our BTech degree I'm from ECE department

[@EngineeringFunda]

@@vishwasvishu1895 ; I am working on it.

[@vishwasvishu1895]

@@EngineeringFunda ok sir Wish to see this soon👍 Waiting....😀🎉

[@varunpalani5090]

Nice, thank you sir

[@akashsaha6105]

sir can you please illustrate how to identify the useful part and which one is useless....it will be very helpful

[@pekaboo5876]

Yes sir.. Please describe how to identify the unuseful components and why they are unuseful.

[@sivakirangurram9543]

Just compare it with am wave general equation

[@megha24nov]

not understood

[@f246riteshranjan9]

Signal which are useful depends on BPF. Here BPF allows only omega frequencies signal to pass. (A bandpass filter allows signals within a selected range of frequencies to be passed , while preventing signals at unwanted frequencies from getting through.)

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[@solomontagesse2115]

good. it is best if u include the reason behind each concepts. For example in BPF response u identified useful and useless terms but no more reasons

[@EngineeringFunda]

See if you have band pass filter of cut off frequencies 20khz and 30khz, then after passing signal through this BPF, it will eliminate all components other than 20khz to 30khz.

[@EngineeringFunda]

Thanks for your suggestions and please give it as it is very much important to me.

[@solomontagesse2115]

Nice thank u sir @@EngineeringFunda

[@EngineeringFunda]

Your welcome dear My name is hitesh .... 😀

[@T.saibharadwaj]

Plz reduce advatisements,class is excellent

[@EngineeringFunda]

This adds only pay something to our people

[@abhiroopdas2995]

u want to watch videos for free and also ad-free...wahhh...have some compassion

[@talhalaiq6452]

great lecture..

[@arnabdatta25]

Thank you sir.

[@EngineeringFunda]

Your positive comments motivates me. Teachers like me just wants positive comment from student. Love from you guys means a lot to me. My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.

[@anilnaik97]

Sir ur explanation is soo good, but I kindly suggest u to say applications of those topics

[@EngineeringFunda]

It is used in communication instruments

[@GauravGupta-pb8mk]

Thank you sir

[@EngineeringFunda]

Love and happiness of students is my ultimate goal, God bless you 🙏, keep learning and keep progressing.

[@RiaziMohandesi]

Signal multiplication at higher frequencies can be accomplished by the square-law modulator.The circuit realization uses a field-effect transistor as the nonlinear element and a parallel RLC circuit as the filter.Unfortunately, perfect square-law devices are rare, so high-frequency DSB is obtained in practice using two AM modulators arranged in a balanced configuration to cancel out the carrier. Communication Systems Book by A. Bruce Carlson and Paul B. Crilly

[@sumit00000]

So nice❤

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All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏

[@srinivasaraokodi8298]

Nice sir

[@heartbrokenlyrics484]

Thank you sir.....!

[@EngineeringFunda]

Thanks and welcome

[@ravikumargautam2465]

Sir, everything is awesome , way of teaching, explaining the concept and sequence of knowledge. But there is the voice breaking problems in lecture please fix that.

[@EngineeringFunda]

In new videos it will be good 👍

[@rishinathrishinath1336]

Very good explanation sir, but your Hand writing is very small sir try to write in big sir for clear identification

[@EngineeringFunda]

Noted ✅

[@कुंवरनितीशसिंह]

Bahut badhiya sir power system, control systems bhi aap hi padha dijiyw

[@EngineeringFunda]

I have already completed control system as control engineering

[@mdkalimullah4207]

Sir poora syllabus complete krwaeiyega. Weare preparing for gate 2019. Also please questions from gate last year. Thanks

[@EngineeringFunda]

Sure

[@arunkumardubey2568]

If we use non- linear device for generating AM signal then what are it limitations?

[@KUNALSINGH-xs7rp]

sir here is also a topic of communication channels w/c is mathematical model of communication channel please make a video on that topic

[@vaibhavkumar912]

please post a vedio regarding wideband fm and use of bessel funtion in it

[@TusharKumar-iu4nt]

Sir on what basis do we classify the terms as useless?

[@mayanksinha7612]

Compare that equation with AM equation, you will get to know

[@5229x]

thank u sir

[@EngineeringFunda]

All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏

[@maheshtiwarisaral207]

Thanks sir

[@EngineeringFunda]

Your positive comments motivates me. Teachers like me just wants positive comment from student. Love from you guys means a lot to me. My goal is to create largest community of engineers in entire globe. Please help me by sharing this playlist with your friends.

[@vedurubhavanireddy9221]

Could please explain about unwanted signal . i.e neglected signal

[@salonivarshney3464]

sir the video and the audio are not in sync...why is that ??

[@EngineeringFunda]

I don't know

[@princekumardiwakar7350]

@@EngineeringFunda Sir please solve this issue bcz it is taking too much time to understand some sentence playing repeatedly

[@AashishKumar-yj9uc]

sir can you make a video on "Collector Modulation" model

[@sushilrajput262]

Sir if we are passing V2(t) signal through the bandpass filter , woudn't the useful part be "B*M^2(t)" be added

[@SANDEEPVERMA-ep6lo]

how we decide useful unuseful terms for band pass filter

[@funkygecko]

It depends on what you need to end up with. This modulator is used for double sideband with full carrier modulation so those are the terms required.

[@arunkumardubey2568]

Assume wc is very large in compare to wm circuit tunned to wc not wm . And respond only to the terms of frequency wc,,, wc+wm and wc-wm. Rest term of output wave equation do not produce appreciable voltage across the tuned circuit.

[@aanshiktiwari1539]

Sir is (square law modulator) single tone or multi tone modulator

[@ajayr2591]

Sir, can u pls explain them with circuit diagram along with this block diagram

[@muthinenianjibabu1934]

Yes sir

[@haarikashreya7005]

Sir, what's the reason that the following signal is useless, i mean some part of signal is useless na before passing through BPF

[@EngineeringFunda]

Haarika shreya : non linear device will generate it . So by BPF we only take useful components

[@12_sayannag74]

non linear device is generated this unwanted signal...then why we use non linear device??

[@shankysays]

Sayan Nag we need some mechanism to multiple the Ac with m(t) . So we use a non linear device which is cheap but we get some extra useless signal which again is removed via a bpf. So it's economical to fo this way

[@12_sayannag74]

@@shankysays thank you....

[@shankysays]

Sayan Nag haha didn't expected a reply. I just posted so that someday someone might see this and start wondering.then he would have an answer. Btw was that info useful for you? Aren't you done with your exams yet?

[@void-li3tn]

Sir, you didn't gave the reason behind why are they unuseful components it would make clear learning if u include those things.

[@nabanitapachal1879]

please make some videos on Gated Balanced Modulator.

[@debapriyadasgupta6534]

sir what is the advantage of this technique over normal technique?

[@gajatejeswarareddy6922]

thanq sir

[@meghashaw4563]

Sir is there any other method to generate AM signal n what is the advantage of this method?

[@EngineeringFunda]

There are some methods but now a days none of this methods is in use. I have explained this to convey basics.

[@meghashaw4563]

Thanks for your response

[@tarang1026]

very usefulllllllllllllll

[@hidarose6663]

Sir pls upload analog integrated circuit portions

[@EngineeringFunda]

Notes 📝

[@hidarose6663]

@@EngineeringFunda videos

[@r2editx]

thnx sir

[@EngineeringFunda]

Your Appreciations, care and share matters a lot to me. #EnginneringLove. All the subjects playlist of Engineering Funda is available in comment section. Share it with your friends to support us. Your positive comments motivates me and person like me get boosted by my students feedback. Thanks and welcome 🙏

[@sureshavev9104]

Sir how can you say the certain terms in that equation are useless and some are useful.

[@EngineeringFunda]

If you pass signal from BPF then other terms will get cancelled which are useless, i mean unwanted.

[@sureshavev9104]

I stongly understand your video. My doubt is when we are going to design a bpf, we need to assign which components has to pass, and which components has to reject.. inorder to do this,we should know,which component is usefless and which one useful before passing through bpf.if we know useless and useful components,then we can design bpf accordingly..so my question is how to know useful and useless component from the output of non linear device mathematical equation.

[@pranavc4397]

Hello Suresh I completely understand your question. The reason that certain terms are useless is because, our main motto here is to transmit our message signal in terms of the amplitude of the carrier signal. If you look the equation carefully there are terms independent of information terms i.e message signal. And last two terms have message signal embedded in the amplitude of the sinusoid signal, this is what we need. So by passing through BPF we are eliminating non-information signal(unwanted signal). And if you ask why use square device if it generates unwanted terms. And the answer depends on the requirement. we can opt another method of performing AM but it involves additional circuitary, which increases cost. So square law modulator is used to suit one's requirement.

[@yaswanthvasu877]

@@pranavc4397 but the term a Ac sinwc t doesn't have message ,it is only carrier signal right ,soo how can we consider it

[@arunkumardubey2568]

@@sureshavev9104 Assume wc is very large in compare to wm circuit tunned to wc not wm . And respond only to the terms of frequency wc,,, wc+wm and wc-wm. Rest term of output wave equation do not produce appreciable voltage across the tuned circuit.

[@Ehmedbaz]

#1 ❤

[@saikatsRhythmicRiffs]

sir please give the videos on coding theory.

[@bhavishyagupta3982]

Sir bpf pe useless signal ka explanation bhi kijiye

[@arunkumardubey2568]

Assume wc is very large in compare to wm so that circuit tunned to wc not wm . And respond only to the terms of frequency wc,,, wc+wm and wc-wm. Rest term of output wave equation do not produce appreciable voltage across the tuned circuit.

[@baibhavkumarsingh7306]

Sir why aAcsinWct is useful component?

[@EngineeringFunda]

In AM, it is there as component.

[@lalbabukumar5215]

sir at the end of lecture u do not explain why htis signle is passing through through BPF

[@EngineeringFunda]

Dear, when you want to reject unwanted spectrum of high frequency then you should use BPF

[@shivanijain5541]

Sir carrier signal continuous hota h toh isme cos aata h aapne sin q liya

[@EngineeringFunda]

In carrier signal sine and cosine does not make any difference

[@shivanijain5541]

Ok thanku

[@gangasharan7013]

Sir *Generation of AM* karwa dijiye

[@edukondalubadveeti6662]

Single tone and frequency,time modulation upload cheyadi sir

[@meAbhi_]

please explain whose waveform are useful and whose waveform are unusefull

[@pavankumar-nq9zj]

Sir, how can we say which is useful signal or else not useful

[@EngineeringFunda]

Message signal is useful.

[@ratnalabhuvaneswar3973]

Sir how do we tell in v2(t) some part is useless

[@saiprakashputrevu7512]

Sir,what is u and ka here... Here what is the relation b/w a and b. for distortionless modulation.what is Ac and Am here...

[@mayanknarang6788]

Bhai phle Amplitude Modulation ke basics kro

[@saiprakashputrevu7512]

I have already learnt the basics... I am asking how the carrier amplitude and amplitude of message are varying here.. Thu pahle am basics pado oor reply karo...

[@radha5930]

Sir,I'm bit confused with that useful and useless component.Why the green part is useless and blue part is useful?Also,how we consider that the blue part is the modulated signal?

[@starkendeavours7072]

You can compare with a general wave Single tone or Multi-tone AM signal. then you can get the Modulated part only useful.

[@godparticle4583]

Useful part has Amplitude, Phase and time

[@chandanavaddi4325]

Instead of sin we take cos is right r wrong??

[@EngineeringFunda]

There is nothing to do with sine or cosine. Sine = cosine + 90degree . So device does not effected by this.

[@shivammaurya7280]

How to identify non useful term before passing through band pass filter???

[@EngineeringFunda]

In AM, we have Wc, Wc - Wm and Wc + Wm are useful. In DSBSC, we have Wc - Wm and Wc + Wm are useful. In SSBSC, we have Wc - Wm or Wc + Wm is useful.

[@shivammaurya7280]

@@EngineeringFunda thank you so much sir...

[@lakshmiprasanna3506]

Do square law demodulator plss

[@natalioramirez6240]

which trig identity are you using

[@libervolucion]

No identity used. He just distributed the square. It's to say: (a+b)² = a² + b² + 2ab. He should have used the sin²(x) = (1-cos(2x))/2 to justify why he can get only AM signal after the Band Pass Filter, but he omitted it.

[@natalioramirez6240]

Don't know how I missed that😥

[@libervolucion]

​@@natalioramirez6240 Don't worry, sometimes it's hard to follow this kind of videos. Just keep it up

[@bhagyeshsolanki5433]

in square law moduator why we took V2(t)=aV1(t)+bV1(t)^2

[@arunkumardubey2568]

Sir apne kaha ki Jo amplitude signal ke actual eqn jaisa hoga vo USEFUL hoga lekin aapne (sinWct ) ko UNUSEFUL le liya. Please explain

[@EngineeringFunda]

It is carrier signal.

[@p.dileep-0392]

Sir why r u not responding to the doubts 😢 otherthan the your compliments

[@somachatterjee3852]

Plz sir clear me why in V2(t) bv1 is square

[@arunkumardubey2568]

By "Taylor expansion" upto square term. Because we are using Square Law device so it will be expanded up to square term

[@bhargavimudagani3357]

Can you make PDF on it sir plz

[@bendivani7817]

How can we judge they are useless components? Please answer me

[@arunkumardubey2568]

Assume wc is very large in compare to wm circuit tunned to wc not wm . And respond only to the terms of frequency wc,,, wc+wm and wc-wm. Rest term of output wave equation do not produce appreciable voltage across the tuned circuit.

[@bendivani7817]

@@arunkumardubey2568 tq

[@arunkumardubey2568]

@@bendivani7817 your welcome🙏❤

[@reddy3307]

Voice is not syncing sir Can you please check the mic and upload clear sir It will be good

[@EngineeringFunda]

Sure dear

[@sparshkathpal9652]

Carrier signal ki value cos wct hoti hai apne yha sin wct ku li hai sir

[@EngineeringFunda]

Both are valid

[@sparshkathpal9652]

Okay sir😇

[@akhila5982]

Sir everything is fine but noise is coming so it's uneasy to listen

[@haripriya6360]

Why didn't you consider cos sir

[@rohitverma-xw6im]

Sir pls frequency spectrum ve plot kiyje

[@saimrudulamaddirala269]

Sir it is not clearly visible

[@EngineeringFunda]

Increase resolution of video and you will get it more clear.

[@saimrudulamaddirala269]

@@EngineeringFunda tq sir

[@s.sakthivel3759]

Screen not clearly visible then how can I continued ur videos

[@EngineeringFunda]

See it with atleast 480p resolution

[@ambarishn6699]

Clean Explanation but How to know That useful not usefull 13:50

[@khushijain4969]

👏

[@EngineeringFunda]

Thanks and welcome

[@saitejaemmadi8652]

Final answer is not appearing

[@shanuverma1233]

lactures are ok but 13 ads in 13 mins lactures just sucks .

[@EngineeringFunda]

Why should I work for nothing ,

[@pranavc4397]

He is doing a great job providing the lectures for free to everyone. Understanding engineering course is not a simple thing. There is a lot of effort involved in mastering the subject and explaining to others. For his effort he deserves some returns. It is not mandatory to show respect to him. It's personal choice. Atleast don't degrade.

[@shanuverma1233]

@@pranavc4397 not degrading , i appreciate the content and efforts as well and thankful for that . Its just a review , as too many interruption makes to lose the consistency and even good content loses its quality. 😊

[@shankysays]

I don't mind the ads even a bit. He is providing such good quality material for free. Why shouldn't he earn some money by monetizing it.

[@sanchittanwar6073]

Aint got any ad in my case for any video even not using ad blocker.

[@rajusuthar6488]

#creatbyspace watch

[@meihyaseen9896]

Sir disturbence bahut hai aas paas

[@deepakapfoths6243]

ckt ?

[@venkataraomedara7423]

Why did u write its un useful signal any one could u give answer

[@AyushYadav-rq8ze]

Bcoz after passing through bpf that signal will be cancel so he considered it as unuseful signal

[@SagarKumar-rd5ln]

Pn sequence generator

[@surya2557]

How v/√2

[@saiprakashputrevu7512]

Sir, plz reply to me

[@chandanavaddi4325]

Pls reply me sir

[@elitebook-g8y]

padhai karwao jhat bhar..attitude maaro raat bhar//////// i will be explaining bla bla bla🤣🤣

[@kaustubhverma338]

Not an elaborative video specially in the end doesn't tell about how BPF does not pass the signals! And audio video synchronization sucks .

[@solimanromemaui3869]

Poor audio, so much noise.

[@growwithNitishk]

worst explanation ever.. no logi behind anything just doing anything, he dont have any clue himself that why and what is happening and he never wanted to know it.

[@chiragjoshi9545]

Sir please teach in hindi or hinglish or else speak proper english as by teaching in english you are loosing your productivity

[@Shivam-zp1cb]

very bad explanation