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The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Simulators >> Circuit Simulators >> Identifying Noise Sources https://designers-guide.org/forum/YaBB.pl?num=1434393069 Message started by Dave F. on Jun 15th, 2015, 11:31am |
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Title: Identifying Noise Sources Post by Dave F. on Jun 15th, 2015, 11:31am Hi, I am trying to understand the noise that I am seeing in my circuit. I am having difficulty reducing the noise, and it seems much higher than what would be expected after reading various textbooks. I am now trying to mess with the model parameters to zero out all noise sources to see which type is contributing the most (thermal, flicker, shot, ...). I have zeroed out every noise-related parameter that I can find, but my noise is almost entirely unchanged. Am I missing some parameters or some fundamental aspect as to how the simulator works? I am using Spectre. These are the parameters I have modified so far: + fnoimod = 0.0 + tnoimod = 0.0 + ef = 1.0 + noia = 0.0 + noib = 0.0 + noic = 0.0 + em = 0 + ntnoi = 0.0 + lintnoi = 0 + af = 1.0 + kf = 0.0 + tnoia = 0.0 + tnoib = 0.0 + rnoia = 0.0 + rnoib = 0.0 I am running transient noise and regular noise Thanks |
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Title: Re: Identifying Noise Sources Post by Geoffrey_Coram on Jun 18th, 2015, 10:46am There should be a way to have Spectre tell you the noise contributions not only from each device but from each noise source within the device; eg, you should be able to see if it's the channel thermal noise, or the noise of the resistors (rd, rs, rg), or the flicker noise. I also think you can turn off the noise of a specific device, something like is_noisy=no (perhaps as an instance parameter?). |
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Title: Re: Identifying Noise Sources Post by sheldon on Jun 26th, 2015, 5:55pm Quanticles, What you are looking for is the noise summary in ADE. It allows you to search the noise sources to identify the primary contributors. The noise summary only works for small signal analysis, noise and pnoise. As Geoffrey says, the noise summary will report on the noise contributors within the device. Of course the effects need to be included in the models. Sheldon |
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