Thank you so much for the informative video. Look forward to see video on 14nm or 7nm CMOS Inverter Characterization with LT SPICE. It will be really helpful.
like 180nm min allowed width is about 1.5 time for nmos and pmos must be twice to form the same characteristics to design an inverter. in the same manner, what is the min allowed width for the nmos and pmos should be how much time? kindly brief it.
Yes the .pm file is the SPICE file to be added to lib\sub folder. To find the correct path of the sub folder we need to click the import instance tab and see the path. The path indicates the lib\sym folder, which has the symbol. In this case we are using the CMOS -4 already available in the lib\sym folder. But we need to go one level higher in the displayed path and then go to sub folder instead of sym folder and paste the .pm file there.
Dear Professor, Please, could you confirm if I can relplace the following command ( .include nfet14nm.lib ) and (include.pfet14nm) to simulate the cmos not gate. Thank you for your helps
Dear Professor, could you confirm if I can simulate the MRAM ( Magnetic RAM ) with LTSPICE. Please, if there are a nother tools which I can simulate the MRAM, please, you inform me Thank you for your helps Best wishes
Answers to some querries by subscribers. 1. How to implement 7nm and 10nm nmos and pmos.. I couldn't implement it like 16nm. Ans. PTM provides two different types of NMOS (high Performance and Low static power nmos) and similarly two different PMOS. You make a lib file named 7nm_HP_nmos.pm for 7nm HP NMOS and use SPICE Command .include 7nm_HP_nmos.pm Similarly we can do for other 7nm devices. 2. Is cmos below 32nm has double gate? Ans. 7nm is a FINFET as we can see in the spice model file. FINFETs have gate on 3 sides, as you can see a FINFET structure in any research paper. 32 nm you got to see the model file. Whatever the case may be from a circuit point of view the gates are shorted internally and you have a single gate terminal for circuit design. 3. If I am using nmos only pass transistor logic for 22nm it suffers from threshold voltage as nmos produces only weak 1. Ans. This is a well-known problem. You will have to use a level restoring inverter at the output or use complementary pass transistor logic to get the full rail-to-rail output. 4.How to overcome this and implement an ideal nmos ? Ans. I won't recommend ideal nmos, when we have more realistic SPICE models. Finally, the circuit requires to be fabricated so using realistic models is always better. 5.why the width is 1u for 16nm? I have gone through a website that width for 45nm and below 45nm technology is just double the length... You can use width of just double the length. I was just demonstrating in the video. Generally nono-meter cmos devices are benchmarked in terms of micro-ampere per micro-meter width.
Yes you can. You may do a google search and you will find few switched capacitor circuits implemented with Monolithic MOSFETs. Sorry for the late response.
I am not aware of a source which provides TSMC 16nm CMOS model files for free. If you come accreoos one let me know. PTM models are only avaliable as open source.
Sir are these latest technologies such as 7nm, 10nm and 14nm etc are FinFET? Wil it work in the same manner that you did with 16nm? ... What will be the recommended value of channel width for 7nm? Is it 7x2=14nm? What would be the best/recommend value for channel width how and how to calculate it??????
@@SanjayVidhyadharan thanks a lot Sir that's help me a lot.. Please continue making video like this.. CNTFET, TFET using LTSpice.. Form device to circuit..
@@SanjayVidhyadharan Sir One more question.. How can I configure FinFET in SG-mode, IG-mode and LP-mode Using LT-SPICE.. and for LP- Mode what will be the Front-gate voltage recommended for NFinFET & PFinFET.. In some journal it was -0.2V for NFinFET and +0.2V for PFinFET for all technology nodes 20n down to 7n.. it is correct??
Sir, I am using 90nm ptm model. Parameter which I used and Vt is what I get [L=90nm, W=180nm, Vt=250mV], L=90nm, W=1um, Vt=250mV, L=1um, W=2um, Vt=450mV]. Vt=450nV is given in sheet. Question: Is it fine to work with W=180nm and Vt= 250mV?? W=2L, is this applicable for every case?
You may verify the VT of 90nm CMOS technology through a google search. Several fab labs publish the technical data. You may us the default Vt provided in the ptm spice model .
Sir, how can I simulate a 16 nm CMOS inverter using "FINFET" LSTP NMOS, and LSTP PMOS PTM models. If you can make a video it will be helpful. Thanking you in anticipation.
@@SanjayVidhyadharan yes sir i downloaded and added to sym in lib but it show could not open include files sir please if u don't mind just give hi to this 9515632725 i will send pic once.
Please sir... Sir .how to get the transfer characteristics? Sir .I'll take the spice directive from CMOSEDU.com Sir Now,the file extension becomes what?
Thank you so much for the informative video. Look forward to see video on 14nm or 7nm CMOS Inverter Characterization with LT SPICE. It will be really helpful.
sanjayvidhyadharan.in/blog/digital-vlsi/
YOU ARE AMAZING!
Thankyou
like 180nm min allowed width is about 1.5 time for nmos and pmos must be twice to form the same characteristics to design an inverter. in the same manner, what is the min allowed width for the nmos and pmos should be how much time? kindly brief it.
Open the SPICE file as text file. The minimum widths migh be specified in the SPICE file
Hello Sir,
As mentioned in the video at 2:40 to copy in the path LTspice\lib\sym but at 3:20 the files are copied to LTspice\lib\sub
Yes the .pm file is the SPICE file to be added to lib\sub folder. To find the correct path of the sub folder we need to click the import instance tab and see the path. The path indicates the lib\sym folder, which has the symbol. In this case we are using the CMOS -4 already available in the lib\sym folder. But we need to go one level higher in the displayed path and then go to sub folder instead of sym folder and paste the .pm file there.
@@SanjayVidhyadharan Thank you Sir
@@sameeraattar8516 please do select file type as all files
@@charanukku5638 tq
Dear Professor, Please, could you confirm if I can relplace the following command ( .include nfet14nm.lib ) and (include.pfet14nm) to simulate the cmos not gate. Thank you for your helps
Since we are just definng the model and using the mosfets avlaible in LT spice , i tink you need to follow the instsructions demonstrated in the video
@@SanjayVidhyadharan Thqnk you very ;uch for your response
Dear Professor,
could you confirm if I can simulate the MRAM ( Magnetic RAM ) with LTSPICE.
Please, if there are a nother tools which I can simulate the MRAM, please, you inform me
Thank you for your helps
Best wishes
Not sure if MRAM spice model is avaliable
@@SanjayVidhyadharan Thank you Professor for your response. Best wishes
Dear Sir, is the ptm model website down?
Are there any other models available on the internet?
Not sure about other web sites. Hope the site comes up soon.
Dear Professor,
Please, could you inform if I can make W=0.75 u for FinFET with 7 nm
Thank you very much for your collaboration .
Best wishes.
The spice file might specify the limits. Open it as textfile and have a look
@@SanjayVidhyadharan Thank you professor for your repsonse .
Best regards.
Answers to some querries by subscribers.
1. How to implement 7nm and 10nm nmos and pmos.. I couldn't implement it like 16nm.
Ans. PTM provides two different types of NMOS (high Performance and Low static power nmos) and similarly two different PMOS. You make a lib file named 7nm_HP_nmos.pm for 7nm HP NMOS and use SPICE Command .include 7nm_HP_nmos.pm Similarly we can do for other 7nm devices.
2. Is cmos below 32nm has double gate?
Ans. 7nm is a FINFET as we can see in the spice model file. FINFETs have gate on 3 sides, as you can see a FINFET structure in any research paper. 32 nm you got to see the model file. Whatever the case may be from a circuit point of view the gates are shorted internally and you have a single gate terminal for circuit design.
3. If I am using nmos only pass transistor logic for 22nm it suffers from threshold voltage as nmos produces only weak 1.
Ans. This is a well-known problem. You will have to use a level restoring inverter at the output or use complementary pass transistor logic to get the full rail-to-rail output.
4.How to overcome this and implement an ideal nmos ?
Ans. I won't recommend ideal nmos, when we have more realistic SPICE models. Finally, the circuit requires to be fabricated so using realistic models is always better.
5.why the width is 1u for 16nm? I have gone through a website that width for 45nm and below 45nm technology is just double the length...
You can use width of just double the length. I was just demonstrating in the video. Generally nono-meter cmos devices are benchmarked in terms of micro-ampere per micro-meter width.
Yes, 7nm and 10 nm can also be implemented in a similar manner.
sanjayv@hyderabad.bits-pilani.ac.in
You connected the Bulk with the other pins. But no node apears. Did you connect it wrong in the video?
thank you this is very helpful
You're welcome!
Sir, while I run after importing it shows. "Could not open include file 16nm.pm". Can u please resolve it sir
Have you paste the files in corrcet folder? Have you inculeed the spice directice? If problem persists mail me @ sanjayv@hyderabad.bits-pilani.ac.in
@@SanjayVidhyadharan ok sir thanks
Sir, Can we use Monolithic MOSFETs for switched capacitor technique??
Yes you can. You may do a google search and you will find few switched capacitor circuits implemented with Monolithic MOSFETs. Sorry for the late response.
Sir, is there model for TSMC 16nm CMOS like 180nm?
I am not aware of a source which provides TSMC 16nm CMOS model files for free. If you come accreoos one let me know. PTM models are only avaliable as open source.
Sir are these latest technologies such as 7nm, 10nm and 14nm etc are FinFET? Wil it work in the same manner that you did with 16nm? ... What will be the recommended value of channel width for 7nm? Is it 7x2=14nm? What would be the best/recommend value for channel width how and how to calculate it??????
Yes 7nm is FINFET. Generally we take W min as 2 Lmin. Actual value depends requirement of circuit.
@@SanjayVidhyadharan thanks a lot Sir that's help me a lot.. Please continue making video like this.. CNTFET, TFET using LTSpice.. Form device to circuit..
@@SanjayVidhyadharan Sir One more question.. How can I configure FinFET in SG-mode, IG-mode and LP-mode Using LT-SPICE.. and for LP- Mode what will be the Front-gate voltage recommended for NFinFET & PFinFET.. In some journal it was -0.2V for NFinFET and +0.2V for PFinFET for all technology nodes 20n down to 7n.. it is correct??
Sir will it work for LTSpice XVII too in the same way?
Please have a look at my video th-cam.com/video/RRcyEBu9Z0M/w-d-xo.html for LTSPICE.
Sir, I am using 90nm ptm model. Parameter which I used and Vt is what I get [L=90nm, W=180nm, Vt=250mV], L=90nm, W=1um, Vt=250mV, L=1um, W=2um, Vt=450mV]. Vt=450nV is given in sheet.
Question:
Is it fine to work with W=180nm and Vt= 250mV??
W=2L, is this applicable for every case?
You may verify the VT of 90nm CMOS technology through a google search. Several fab labs publish the technical data. You may us the default Vt provided in the ptm spice model .
can we simulate nand gate for 22nm in ltspice
Yes you can simulate NAND NOR or for that matter any other circuit. I have just demonstrated an example of inverter.
Hello sir... I got stuck somewhere while simulating a circuit.. Got a message could not open include file 16nm.pm
I have mailed you the details to check.
Hey Yaar
I also got the same problem.
Can you tell me ,how to resolve this?
@RAJNI SUDAN
@@SanjayVidhyadharan Dear sir, Can you also send to me this file?
Sir, how can I simulate a 16 nm CMOS inverter using "FINFET" LSTP NMOS, and LSTP PMOS PTM models. If you can make a video it will be helpful. Thanking you in anticipation.
You may please call me up on my mobile
sir, Have you simulated it using LSTP NMOS and LSTP PMOS? If yes please guide me how
How to add finfet model in ltspice?
sanjayv@hyderabad.bits-pilani.ac.in
hello sir, sir it showing could not open files
You need to download it
@@SanjayVidhyadharan yes sir
i downloaded and added to sym in lib
but it show could not open include files
sir please if u don't mind just give hi to this 9515632725 i will send pic once.
@@harekirshna_Tr Sorry missed your message. Is the problem resolved? Else you may mail me at sanjayv@hyderabad.bits-pilani.ac.in
sir how can I get INL & DNL in lt spice please
You have to do DC characterization. Sweep input voltage form rail to rail and plot output.
Sir...can you help me in designing CURRENT STARVED VCO in 50nm Technology using Lt spice.?
Please sir...
Sir .how to get the transfer characteristics?
Sir .I'll take the spice directive from CMOSEDU.com
Sir
Now,the file extension becomes what?
The name has to be same as the .lib file.
Thank u sir
Welcome
LTSPICE does not support FinFET device simulation 🙃
The proceddure may be similar. I have not tried it