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BJT schematic simulations and layout

Hello,

I am not very experienced in IC design and cadence but I am trying to learn.

Can someone please explain to me or direct me to references that explain how to create a BJT layout in cadence virtuoso as well as creating its models for simulations? I have only tried using the ami06 technology library files, please let me know if they are a good choice for BJTs or if there are better ones?

Thanks,

Andrew Beckett 11 months ago

Since this is a CMOS technology, you'll only have the possibility of poor bipolar (maybe a lateral NPN and vertical PNP). Many CMOS PDKs will provide such a device for use in (say) bandgap circuits. If it's not in the PDK you'd need to generate the layout, make a chip, characterise it and build a model - I would start by a) reading the PDK documentation, and b) contacting OnSemi (since it's their technology I believe) about what exists already.

Andrew.
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Sarah1898 11 months ago in reply to Andrew Beckett

These are the few ones that exist. If you could possibly direct me by letting me know which ones are more towards BJTs? I apologize as I am knowledgeable about this yet so I am trying to learn. I am open to learning about the other processes if they include my target of BJTs.

What are some refernces that I can find how to draw the lateral npn or vertical pnp you mentioned?

Thanks,
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Andrew Beckett 11 months ago in reply to Sarah1898

The NCSU CDK is extremely limited in the functionality it supports for all these technologies. Having taken a quick look a them, they only seem to offer an nmos and pmos device for each, and I think all of those technologies are CMOS technologies anyway (so the technology may support limited bipolars, but they have not been implemented in the CDK for reasons you would need to ask NCSU).

You may find more if you can access the AMI 0.6u technology from OnSemi directly - their PDK is likely to be richer than that from NCSU - as would the TSMC PDKs too (I can't quite tell what they correspond to though without a lot of digging). Of course, this all depends on what you have access to as a (presumably) academic institution.

Regards,

Andrew
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Sarah1898 11 months ago in reply to Andrew Beckett

Thank you so much for your great help
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Frank Wiedmann 11 months ago

You could also take a look at the IHP Open Source PDK at https://www.ihp-microelectronics.com/services/research-and-prototyping-service/fast-design-enablement/open-source-pdk
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