@User In many cases (in my working experience at least) "fast" empirical device models written by ''cad support teams'' turned out to be even slower than the most precise analytical BSIM model, because of discontinuities/poorly written equations. Even a single device with a poorly written empirical model can slow down or even make the simulator fail to converge on a very big design.

Hi, I'm doing LVS on a ring oscillator to get some familiarity with the tools. I found that by default, netgen says the circuits don't match (with

Networks match locally but not globally. Probably connections are swapped.

). As described in the netgen reference, this seems to be a false positive - it goes away and I get

Result: Circuits match uniquely

when using

-full

/

symmetry full

. Is using

-full

a good way to resolve these symmetries, or is it better to break the symmetry in the schematic somehow?

hi do anyone have any idea of an opensource software for library characterisation

do anyone have material on doing layout of a diode in magic

here what is the difference between leakage power and cell leakage power

@User

9.4.1 
cell_leakage_power Simple Attribute
This attribute specifies the leakage power of a cell.
If this attribute is missing or negative,the value of the default_cell_leakage_power attribute is used.
Syntax
  cell_leakage_power:value
    float;value
      A floating-point number indicating the leakage power of the cell.
Note:
You must define this attribute for cells with state-dependent leakage power to provide the leakage power value for those states where the state-specific leakage power has not been specified using the leakage_power (leakage_power () {...} ) group.
<https://people.eecs.berkeley.edu/~alanmi/publications/other/liberty13_03.pdf>

i had a doubt like how output capacitances and slew times for timing library are usually selected in library file format

how area is represent in the form metal 1

@User standard cells of a given library have all the same height (in some rare cases there are also some double height cells). This allows to place the standard cells in rows. Top horizontal row is a VDD (or GND) supply rail, bottom row is a GND (or VDD) rail. In between there is room for a certain number of horizontal metal 1 signal rows. A library of cells allowing 11 metal1 tracks is easier to route at the expense of some layout space. The high density (hd) library cells allow less metal 1 signals because they are smaller, lower height; less area but harder to route. In some cases extra space must be introduced to allow routing.

can someone explain me use of FLASH_IO0,FLASH_IO1,FLASH_IO2 pins in spiflash

Hi professor / All, Would like to understand how the read / write assist and read / write margin impacts the memory behaviour of SRAM . Please help to understand .

Hi everybody

I want to ask about open source tools

The best way to get help on forums and chat is to ask a specific question. You don't need to ask about asking a question. If someone knows, they will respond. It's poor form to ask the same thing in many places or follow up multiple times without waiting a while. It is poor form to tag the channel and notify everyone since they're in many time zones. The traffic is pretty slow here, but if people start asking questions and answering them it could become useful.

But I didn't tag anybody or did I?

ok, thanks for letting me know

Another bit of general advice: if you have a specific problem with a tool, provide an example to make it easier for people to understand what you are doing and help. If you make it hard, you will get fewer responses. In addition, while isolating the issue, you often learn what the problem is!

I am clueless and confused about many things

set the channel description: General (non-Skywater specific) discussion of circuits, fabrication, parasitics, modeling, etc. For best responses: 1) ask specific questions, 2) provide details or examples, 3) be patient for responses, and 4) don't tag the entire channel.

@User Do you have any specific questions? Perhaps the introduction videos could help you to get up to speed: https://docs.google.com/spreadsheets/d/1fM301JZe_2h0-mTfyahFGRWqt3fDhnnSe2X3_pM5GKI/edit#gid=0

Thanks very much for this sorted and organised list of videos. It will help me a lot in the long run and it will help me getting myself updated

https://techiefoulders.blogspot.com/ Hi friends, I have a bunch of interview questions for various domains and for various experienced roles. You can refer them as per your requirement. If anyone wants to share interview questions for any roles in VLSI can ping me and share me the questions that have been missed out. Thank you so much for the support

@User has left the channel

Jame Stine's group at Oklahoma State created https://docs.google.com/document/d/1hSLKsz9xcEJgAMmYYer5cDwvPqas9_JGRUAgEORx1Yw/edit#

@User has left the channel

@User has left the channel

Is it possible to do MEMS design with the Sky130 PDK and Magic/Klayout? Looking at the fact that only regular shapes are allowed in both these tools, I think that the answer is going to be no.

<!channel>: New year, new adventures. This channel has not been much used in the past year, but I would like to make use of it for putting together documentation for how to manage a complete end-to-end design from concept to layout for both pure analog and mixed-signal designs. There is a wealth of information on the web with instructional videos from university courses and similar content. I expect most of this content to be rather piecemeal, mostly concentrated on the design of single circuits rather than an explanation of a full end-to-end flow. I'd like to create the documentation that links it all together, especially to provide instructions on how to use open source tools (xschem, magic, klayout, netgen, ngspice, xyce, etc.) to complete a working design for a Caravan or (upcoming!) Caravel/Caravan "open frame" chip. I am doing a channel blast so I can get feedback from people, both instructors and students (or "instructees", maybe), on what are the most valuable online resources available for analog and mixed-signal design, so I can get something started. Please let me know what online videos, tutorials, textbooks, or other help you know of that provide a valuable resource for understanding analog and mixed-signal circuit design. Thanks!

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