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rgbi in Cadence noise simulaion (Read 1363 times)
Stridertang
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rgbi in Cadence noise simulaion
Jun 09th, 2015, 11:17pm
 
When I do a noise simulation for an LNA, the noise summary shows a "rgbi" as noise parameter, and my question is what is this kind noise comes from? How can we reduce the rgbi noise ?

Thanks
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spectrallypure
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Re: rgbi in Cadence noise simulaion
Reply #1 - Oct 4th, 2018, 6:30pm
 
Hi Stridertang! I've come across the same problem... did you ever find out what is this noise modelling? In my noise summary it's the dominant source of noise!
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Ken Kundert
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Re: rgbi in Cadence noise simulaion
Reply #2 - Oct 5th, 2018, 6:44am
 
Perhaps it would help if you indicated what kind of device was producing this noise.

-Ken
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Andrew Beckett
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Re: rgbi in Cadence noise simulaion
Reply #3 - Oct 21st, 2018, 11:07am
 
I expect this is:

rgbi: Gate Bias-Independent Resistor thermal noise

However, to be certain, knowing the device type would help, as Ken said.

Regards,

Andrew.

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Geoffrey_Coram
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Re: rgbi in Cadence noise simulaion
Reply #4 - Oct 22nd, 2018, 6:20am
 
Speculating even further: I do recall an issue in BSIM4, version 4.5.0, where the noise for RGATEMOD=2 was incorrect; this was fixed in version 4.6.0. I've attached a screenshot from BSIM460_ReleaseNotes.pdf

This fix was made a while ago, but some foundries are still specifying version=4.5 in their model files.
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bsim460.gif

If at first you do succeed, STOP, raise your standards, and stop wasting your time.
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