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How to plot MOSFET model parameters like gds in Cadence using GUI? (Read 4471 times)
Bean Nakamura
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How to plot MOSFET model parameters like gds in Cadence using GUI?
Feb 28th, 2017, 6:07am
 
Hello all,
I hope you don't mind me asking as I'm an undergrad just starting to venture into the IC design realm. As per the question above, I would like to plot some intrinsic parameters (Cgs or gds or vth) when the MOSFET biasing is swept over a range of values. How do I go about doing that via GUI? I have no experience on netlisting or SKILL and have definitely looked up the manual which made little to no sense to me. Is there somewhere I can get examples of easy-to-understand and practical Cadence netlists for undergrad level? A pdf would be nice. Also, side question, how is an op amp designed in the industry? The models given to us in class are Level 1 parameters while the PDK used is Level 54. A lot of the pre-calculated values using the model lead to very different gain values, which is why I wanted to observe the parameters when biased differently. Thanks again and sorry for the noobish question.

Regards.
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ULPAnalog
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Re: How to plot MOSFET model parameters like gds in Cadence using GUI?
Reply #1 - Feb 28th, 2017, 9:26am
 
Quote:
I would like to plot some intrinsic parameters (Cgs or gds or vth) when the MOSFET biasing is swept over a range of values. How do I go about doing that via GUI

You may want to have a look at http://community.cadence.com/cadence_technology_forums/f/33/t/21507

Quote:
how is an op amp designed in the industry? The models given to us in class are Level 1 parameters while the PDK used is Level 54.

I usually use the method of gm/Id for designing. You can search for the lecture notes of Prof. Boris Murmann on the same.
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Bean Nakamura
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Re: How to plot MOSFET model parameters like gds in Cadence using GUI?
Reply #2 - Mar 1st, 2017, 3:45am
 
Thank you so much for your input ULPAnalog! I really appreciate it!  :)
I looked up the gm/Id technique and it looks really promising! However, would it still work if the Id is given as a specification? Also, I couldn't find any lecture notes from Prof Boris Murmann's EE214 from Stanford and upon further digging found that they've removed all the previous lecture notes. Is there any reading material (textbook preferably) that mentions this technique that you've come across?
Thanks in advance!
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Geoffrey_Coram
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Re: How to plot MOSFET model parameters like gds in Cadence using GUI?
Reply #3 - Mar 1st, 2017, 8:12am
 
I haven't read this book myself, but I had a colleague recommend it as a reference for "inversion coefficient":
<<link to search.ebscohost.com deleted by administrator>>
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« Last Edit: Mar 3rd, 2017, 10:01am by Ken Kundert »  

If at first you do succeed, STOP, raise your standards, and stop wasting your time.
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Bean Nakamura
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Re: How to plot MOSFET model parameters like gds in Cadence using GUI?
Reply #4 - Mar 1st, 2017, 9:40am
 
Thanks for your input Geoffrey_Coram! I tried clicking on the link but it says no results found with the book title being "AN 246568" . I must've missed something here but not sure what lol. Would you mind giving me the book title instead? Thanks in advance!  :)
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ULPAnalog
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Re: How to plot MOSFET model parameters like gds in Cadence using GUI?
Reply #5 - Mar 2nd, 2017, 7:25am
 
Perhaps Geoffrey Coram was referring to the book titled "Tradeoffs and Optimization in Analog CMOS Design" by David Binkley.

I would also recommend to have a look at "The gm/ID Methodology, a sizing tool for low-voltage analog CMOS Circuits" by Paul Jespers.
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Bean Nakamura
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Re: How to plot MOSFET model parameters like gds in Cadence using GUI?
Reply #6 - Mar 3rd, 2017, 12:41am
 
Thanks again ULPAnalog! Really appreciate it!  :)
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Geoffrey_Coram
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Re: How to plot MOSFET model parameters like gds in Cadence using GUI?
Reply #7 - Mar 3rd, 2017, 6:36am
 
Yes, ULPAnalog, that was what I was trying to refer to; I used the "permalink" button on the EBSCO web site, but clearly that didn't do what I wanted it to.
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