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Noise simulation in SAR ADCs (Read 3503 times)

RobG

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Bozeman, MT

Noise simulation in SAR ADCs
Feb 09^th, 2015, 2:20pm

I designing a 12 bit SAR adc and I'm wondering if there are any clever ways of simulating noise. I can evaluate the parts individually with small signal noise analysis and they seem fine, but I lose performance when I do a transient noise analysis.

I am suspicious of the transient noise simulation for some reasons worth a thread of its own... Is there a way I can analyze this with pnoise, etc? I have a lot of redundancy so it is only the last few comparisons that determine the error.

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sheldon

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Re: Noise simulation in SAR ADCs
Reply #1 - Feb 9^th, 2015, 3:25pm

RobG,

If you are a Cadence user and can access the support site,
there is a video and Rapid Adoption Kit, that discusses simulation
of SARADC designs. The problem is that there are many sources
of error and you need to be able to not only simulate the noise
but know which noise source is limiting performance. Transient
noise does not directly provide that information.

Sheldon

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RobG Community Fellow Offline Posts: 570 Bozeman, MT	Re: Noise simulation in SAR ADCs Reply #2 - Feb 9^th, 2015, 4:15pm Thanks - I wouldn't have known about that. Yes it is cadence. I put a question on the cadence site about multithreading not threading if you know the answer to that... http://community.cadence.com/cadence_technology_forums/f/38/t/31549
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Ken Kundert Global Moderator Offline Posts: 2386 Silicon Valley	Re: Noise simulation in SAR ADCs Reply #3 - Feb 11^th, 2015, 1:34pm You should be able to use a pnoise analysis. You just need to make the circuit periodic. I would thing applying a DC input and simulating a single conversion should do it. You might want to spend a little time thinking about your circuit and making sure all the noise sources would be exercised in such a test. -Ken
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