Video discusses about Band Gap Reference used in all ICs. Both circuit theory and Layout matching requirements are discussed.
Пікірлер: 118
@sigangsabaglari36062 жыл бұрын
Learning all these practical aspects of analog engineering while studying in prefinal year of college. I'm loving it.
@relali2009 Жыл бұрын
Thank you for these videos, I never get tired or lost. back in school it was easy to drift away from the lecture, now I know it wasn't me, rather it was the lecturer... thank you
@analoglayoutdesign2342 Жыл бұрын
Thanks for the feedback
@tranhuuthong07 Жыл бұрын
This is a great lecture, thank you so much, Professor! The content of the lecture is very helpful for me.
@analoglayoutdesign2342 Жыл бұрын
Thanks for the feedback
@kiran76403 жыл бұрын
This is the best video on BGR
@dtpx7787 ай бұрын
Thank you really MUCH! In the script from my university it was explained horribly, but thatks to this video I got it ! Thanks
@analoglayoutdesign23427 ай бұрын
Thanks for the feedback.
@mahmoudsaad11792 жыл бұрын
thanks for all the knowledge u share with the world
@gauravhatwalne9394 Жыл бұрын
Very complex concept explained in very to understand language and that too in depth 🙏🙏🙌🙌 Thank you so much sir😇
@analoglayoutdesign2342 Жыл бұрын
Thanks for the feedback
@vijanvijan19364 ай бұрын
Ur really great sir....i get clear understanding
@asha5033 жыл бұрын
Nicely explained...👍...All ur videos are very informative and explained well....helped a lot in clearly understanding so many concepts... Would like to see more videos in coming days...keep up the good work..All the very best for ur channel 👍👍
@sudhakarshrinivas2 жыл бұрын
Very nicely explained sir. Please share the two stage opamp video of this part. Thanks
@dundu0073 жыл бұрын
Nicely explained...
@bramhdevsingh98264 жыл бұрын
very nice and informative video thanks
@seekinggod3174 Жыл бұрын
Very clear explanation. Thanks for the education.
@analoglayoutdesign2342 Жыл бұрын
Thanks for the feedback
@abbashammoud7205 Жыл бұрын
Thank you ! Can you please add a video on how to integrate the opamp in CMOS and discuss the startup circuit ?
@analoglayoutdesign2342 Жыл бұрын
Ok will do.. thanks for the feedback
@hasliadiguliga39794 жыл бұрын
Hi Sir. I really enjoy watching your lectures. Thank you. The content is very helpful to me to understand the concept of the analog design. I am sorry to say this, the content of this slide is very good and understood, but the audio is very poor compared to other lectures (video). I am looking forward to watching your next lectures with good quality audio. Thank you and Thumb up!!
@analoglayoutdesign23424 жыл бұрын
sorry for the poor audio...will ensure that audio will be clear hereafter
@sudhirbabu68032 жыл бұрын
Well said Sir 👌
@sunkarasaigoutham3 жыл бұрын
I didn't give much thought for why it is called BGR. The reason explained in the video is that Band-Gap voltage is 1.2eV and it is similar to Band-Gap reference voltage we get which is usually 1.2V.
@khs5054 Жыл бұрын
When calculated, Vref becomes Eg/q in case of T=0K. Read chapter Bandgap References in Design of Analog CMOS Integrated Circuit by Razavi.
@anilkumarpattapu430910 күн бұрын
Only it provides constant ouput v or i respective of temperature variations? It is not if voltage supplay varies will not vontrol,
@analoglayoutdesign23429 күн бұрын
This architecture provides constant voltage and ptat current. Sub 1v architecture provides constant voltage and ztat current
@amoghalokesh4422 жыл бұрын
Hi, I am actually a new college graduate who is now working as a analog designer and your videos are really helpful. At 30:53 minutes you have shown a Sub 1V BGR and mentioned that will be discussed in a different video. Can you please upload a video on that particular circuit. It would be really helpful.
@analoglayoutdesign23422 жыл бұрын
Thanks for the feedback. Will make video on sub1v bgr
@amlande5597 Жыл бұрын
Yes pls make one.
@Gkcptplm4 жыл бұрын
At 21:17 why only R1 is considered ? That path current should be decided by both R1 and R2 ,rt? Vt ln(n) is the voltage at + input ,so ideally current through R2 should be drain voltage of MP2 - Vt ln(n) divided by R2,rt? or am I missing something here?
@analoglayoutdesign23424 жыл бұрын
vtln(n)/R2 is the current in R2. That same current current comes from the current source MP2. So.. The drop across R1 is current flowing in R1 X resistance R1.... current flowing in R1 is nothing but current flowing in R2...which is Vtln(n)/R2...substituting it we get that equation... Current in the MP2 is set by the loop thru its gate... hope I answered...why we dont take voltage across MP2 is because its current source... current source can have any voltage across it..still current in it is same...we cant apply KVL across current source..hope this answers
@samudravishalmukherji73299 ай бұрын
Do you have the video for the start up circuit and also how to generate the IPTAT? can you please share the link?
@analoglayoutdesign23429 ай бұрын
Startup circuits can be found easily in search engines.. IPTAT is nothing but the current source that is for the bjt .. a mirrored one of that
@IKeraNI Жыл бұрын
Thank you so much sir, you are my king
@analoglayoutdesign2342 Жыл бұрын
Thanks
@211SANDEEP2114 жыл бұрын
👌👌👍👍
@tejashreekulkarni53744 жыл бұрын
Hello sir.. It is a wonderful video which helped me a lot to understand.... Thank you .. could you please share the LDO and VCO videos also... that may help us ...
@analoglayoutdesign23424 жыл бұрын
sure..first ldo maybe later vco
@tejashreekulkarni53744 жыл бұрын
Analog Layout & Design Thank you
@vishwanathpatil98174 жыл бұрын
Thank you! Is there any way I can get these slides ?
@analoglayoutdesign23424 жыл бұрын
explanations will not be there in slides...I write it while recording the video...so slides alone will not be useful
@karthickkumar138011 ай бұрын
God You Saved me✨✨
@analoglayoutdesign234210 ай бұрын
Good luck
@piezero_5673 ай бұрын
For ptat ckt. Generation are we taking beta of the bjt as infinite because only then base current is negligible....?
@analoglayoutdesign23423 ай бұрын
Here bjt used as diode.. it’s now variation of vbe as pn junction
@harshakanamarlapudi16814 жыл бұрын
Need of matching also to vary the Pvt variations ? Correct .?
@analoglayoutdesign23424 жыл бұрын
yes...matching is basically to counter gradients in fabrication...please watch semiconductor resistors video...
@ihk56484 жыл бұрын
You are an excellent teacher! Could you please explain MOS comparator / op amplifier in similar manner?
@analoglayoutdesign23424 жыл бұрын
thanks...plan is there for 5transistor OTA..soon..
@ihk56484 жыл бұрын
@@analoglayoutdesign2342 Thank you Sir!
@manideepabhi11713 жыл бұрын
Sir !! Please! please! .. ...Send ur mail id to mine.... vegyarapumanideep@gmail.com Plz sir i wont distub u much... I 'll list out and ping u once in a while..
@analoglayoutdesign23423 жыл бұрын
jt.analog@gmail.com
@alterguy43273 жыл бұрын
Here we could have used Diode connected MOSFET instead of Diode connected BJT, since both have same IV characteristics. Is there any specific reason for choosing BJT? Thanks for the video, It was really helpful
@analoglayoutdesign23423 жыл бұрын
ya..we can generate MOSFET based BGR, but there would be a need of two transistors with different Vt.we will need one extra Threshold adjust implant layer....it comes at a cost..... that becomes a hard constraint. on the other hand, we dont need anything extra when we use BJT based diode.... this bjt diode is parasitic bjt....substrate PNP... so doesnt impose any requirement on fabrication.
@analoglayoutdesign23423 жыл бұрын
so bjt diode is ubiquitously used...
@alterguy43273 жыл бұрын
@@analoglayoutdesign2342 Thankyou
@sunkarasaigoutham3 жыл бұрын
are there any designs where bjt ratio is different from 1:8? Could you please point me to those designs? Overall very informative video. Thank you so much for sharing your knowledge. May I know which company do you work for?
@analoglayoutdesign23423 жыл бұрын
yes sometimes they use more...if unit size of bjt is small...it will be more than twenty devices...
@naresh4905903 жыл бұрын
Thanks For the video. At 9:00 what is the Thermal voltage of the BJP, How it will increase when temperature increases, is it the junction potential ? if we connected BJTs in parallel how the PTAT voltage will become M times VT ?
@analoglayoutdesign23423 жыл бұрын
Thermal voltage is KT/q... Where T is temperature. This will be around 26mV typically. Its directly proportional to temp.
@bhaskarreddy39154 жыл бұрын
we take 8 bjt's for layout matching only ?
@analoglayoutdesign23424 жыл бұрын
8 and 1: together 9 bjts
@sardharvankunavath1988 Жыл бұрын
I am not able to find 2nd video can u provide
@analoglayoutdesign2342 Жыл бұрын
In the making
@hemantpise34143 жыл бұрын
what is the value for equation VBE2+VT ln(n)(1+r2/r1) here ln(n)=2 , (1+r2/r1)=11 , VT= 0.087mv/c. so what is the final ans? please explain calculation
@analoglayoutdesign23423 жыл бұрын
yes..all put together will be your bandgap voltage~1.2V.
@kamalprasad32932 жыл бұрын
Hello sir your explanation is very good, can you please mention better book names which is helpful for analog layout thankyou in advance
@analoglayoutdesign23422 жыл бұрын
Majority of the content is from internet search..
@saisethuramkolli9015 Жыл бұрын
Good Explanation, Can u please provide a link to reach you? If there is a simulation assistance for each Analog block in this channel, it will be helpful. As soon as possible. The content of this lecture is good.
@analoglayoutdesign2342 Жыл бұрын
You can reach me on jt.analog@gmail.com
@analoglayoutdesign2342 Жыл бұрын
Regarding simulation, even I have similar thought… but will see how to make that available.. thanks for feedback
@sagarverma43863 жыл бұрын
Thanks Sir for these lectures, Can we have some lectures on Impedance matching and Tuning circuits used in SERDES.
@analoglayoutdesign23423 жыл бұрын
those are advanced topics....let me plan for those...
@rutujakulkarni61613 жыл бұрын
Hi can you give link of second part.. i could not find it
@analoglayoutdesign23423 жыл бұрын
Its still not there.. Should record and upload.
@ashokkumar-kp1et4 жыл бұрын
Any link for sub 1v architecture?
@analoglayoutdesign23424 жыл бұрын
I will be posting one more video on that..kindly wait
@maksudulhossainjewel3783 жыл бұрын
Good lecture but too many ads!
@dennisylaya4453 жыл бұрын
Thank you for the explanation sir. I tried to simulate bandgap voltage reference using hspice, unfortunately the operation region of the two pmos that I added in my op-amp to produce a bandgap reference is in cutoff region. Can you enlighten me as to why it operated in cutoff region?
@analoglayoutdesign23423 жыл бұрын
You mean the input diff pmos pair of the opamp?what is supply voltage , vt and technology?
@analoglayoutdesign23423 жыл бұрын
I generally advice to check BGR using ideal error amp.. So that u can check if circuit is working. Separately design opamp and check if that's working for the reqd range. Then replace ideal opamp with actual... This is my approach.. Think abt it..
@dennisylaya4453 жыл бұрын
@@analoglayoutdesign2342 hello sir. can you check what's wrong with the values of the elements of my bgr? q1 gnd gnd vin- pnp10 area=5 q2 gnd gnd vr2 pnp10 area=5 mp1 vr1 vout vdd vdd pch w=20u l=1u mp2 vbg vout vdd vdd pch w=20u l=1u r1 vr1 vin- 100k r2 vbg vin+ 100k r3 vin+ vr2 1k vdd is 1.8v and i also used my own constant gm current circuit with 20uA.
@analoglayoutdesign23423 жыл бұрын
Hi Dennis, Bjt area will be 1:8 generally. R2:R3 ratio will be 10-12. Are u using ideal opamp? Please go thru the calculation Also look into example circuits and simulate them
@analoglayoutdesign23423 жыл бұрын
They will help u a lot
@SanjayKumar-wx1te4 жыл бұрын
We have any thermal runaway effect due to BJT ??
@analoglayoutdesign23424 жыл бұрын
Thermal runaway happens when the BJT is biased for amplification(Ic=Beta times IB) and also there is substantially high current. Here we are using it as diode, secondly this is not a actual BJT. its parasitic substrate BJT. so the beta of this BJT will be only 5 or 10 unlike 100 of an actual BJT. Also the current that flows in will be in less than 10uA. the package will be able to quench the heat generated by such kind of temperature rise due to such small current. Hope this answers.
@SanjayKumar-wx1te4 жыл бұрын
@@analoglayoutdesign2342 Thanks
@rajasekharnallamekala49504 жыл бұрын
Hi Sanjay ,in BGR ckt what is the purpose of bjt ? If u know tell me your answer
@SanjayKumar-wx1te4 жыл бұрын
@@rajasekharnallamekala4950 Hi Rajasekhar , Diode current will have proportional temperature coefficient PTAT we can tell. Here Bjt are used as diodes, compare to actual diodes BJT created diodes will give better diode action. If we connect as diode collector and base tied here beta Ic/Ib =1 here always. If any change in beta due to external parameters. If beta increases is there any impact is my question. As beta increases temp increases and vice versa is thermal runway. Hope I answered your question.
@rajasekharnallamekala49504 жыл бұрын
Here bjt is diode cncted device ( collector and base shorted ) . IC equal to beta into Ib .. if beta value increses temperature Increses and thermal runway Increses ok . But in above msg sir mentioned beta Value is 5 to 10 only and IC equal to just 10 micro amp. Small amount of current can handle. Finally I am expecting in simple one word purpose of bjt in BGR is ?
@arun653944 жыл бұрын
Hello sir, At 36:0, In Vbg equation 1 Plus is not mention with Resistor ratio.
@analoglayoutdesign23424 жыл бұрын
When I calculate the output Bandgap voltage with respect to VBE1 then it will be only R2/R1.. but when I calculate the Bandgap voltage with respect to VBE2, then its (1+R2/R1)... just check if I am wright...
@surajsingh-nx6zl Жыл бұрын
Nice explanation but in cmos also we use npn
@analoglayoutdesign2342 Жыл бұрын
That’s BiCMOS process or BCDMOS process
@rajasekharnallamekala49504 жыл бұрын
In BGR ckt what is the purpose of bjt
@analoglayoutdesign23424 жыл бұрын
bjt will produce CTAT. please go thru the video again
@rajasekharnallamekala49504 жыл бұрын
@@analoglayoutdesign2342 ok
@jethrobo35818 ай бұрын
Video is superb, however I cannot interpret some of the words you are saying. Would love it if you could remake the video speaking much slower. Thanks.
@analoglayoutdesign23428 ай бұрын
To remake video is a huge effort.. however I will take care in future. Thanks for feedback
@srikanthSrikanth-to7jh4 жыл бұрын
please sir do a video of current mirror 2 and apamp ckt with different layout matching techniques and how to do a perfect floorplan for any analog layout becease of these stuffs i didnt get a job please sir help to get a job
@analoglayoutdesign23424 жыл бұрын
sure...I will... just need time..
@hemantpise34143 жыл бұрын
why we used only parasitic pnp why not npn
@analoglayoutdesign23423 жыл бұрын
easy to construct...basically its diode that we need...for vbe
@hemantpise34143 жыл бұрын
can you guide us how to used mod gen efficiently
@analoglayoutdesign23423 жыл бұрын
i didnt get you
@hemantpise34143 жыл бұрын
I mean to say that modgen tool which is used for matching and some other purpose so can you make a video on modgen tool
@analoglayoutdesign23423 жыл бұрын
@@hemantpise3414 ok got it..
@hemantpise34143 жыл бұрын
It's my humble request to make one video
@adityaraj72962 жыл бұрын
Please use a pop filter for your microphone
@analoglayoutdesign23422 жыл бұрын
Thanks for the feedback. Will do.
@nathanverger792 жыл бұрын
Good explanation but the sound is very bad
@analoglayoutdesign23422 жыл бұрын
My apologies for bad audio..its rectified in other videos