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steve.taranovich
steve.taranovich
6/21/2013 9:01:56 PM
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Re: Noise & resolution
Walt Kester is a master at this stuff http://www.analog.com/library/analogdialogue/archives/40-02/adc_noise.html

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Brad Albing
Brad Albing
6/17/2013 4:10:58 PM
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Re: Noise & resolution
@Steve >>To help minimize this effect, you can add 1/2 lsb rms broadband noise or less (Caution---adding too much noise can hurt the dynamic range). I'm visualizing a knob marked "Noise" that you can adjust for peak performance of your ADC system.

Do you have the link for that Walt Kester article?

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Brad Albing
Brad Albing
6/17/2013 4:07:49 PM
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Re: The upside of noise
@DaeJ >> Noise is like dust. And related to that, noise is like dirt - with a similar flexible definition: stuff that you don't want mixed in with stuff that you do want. So the same stuff can be OK in some places and completely unwanted elsewhere. Kind of like hair in your eggs; or eggs in your hair.

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Brad Albing
Brad Albing
6/17/2013 4:02:52 PM
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Re: Noise supression chip
@jbike - You should probably write more about this in a blog - especially the issue of noise due to proximity of the digital and analog cktry within the integrated analog/mixed signal IC.

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goafrit2
goafrit2
6/17/2013 11:42:31 AM
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Re: The upside of noise
>> For example, inside cabin of vehicle has more noise while driving compared with that in engine ideal.

The pros that work on cabin design especially in cars, they simply jam the noise especially when it is within the audio frequency range. You do not want that to be heared. There are tricks but total elimination of noise is not possible. All one has to do is manage it and design circuits and systems that can function reliably within them.

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goafrit2
goafrit2
6/17/2013 11:39:28 AM
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Re: Noise & resolution
>> There are also "tricks" you can do by adding noise to your signal, then sampling at a higher rate, process the results, and get a few more bits out of your ADC.

It is turning the lime into lemonade design. My boss likes it a lot. However, most of those extra bits are marketing bits. You claim it is 14 bits when indeed ENOB of 12 bits. Only the novice will be confused!

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goafrit2
goafrit2
6/17/2013 11:37:32 AM
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Re: The upside of noise
>>  if it wasn't for noise, our jobs would be so much easier, that lesser-skilled folks do do them, in many cases

But noice in a process is good. People utilize that ability to model behaviors of neurons in most neuromorphic circuuits. You have this stoachastic process you need in biocircuits and you get that out via the inherent noice in circuits and systems

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goafrit2
goafrit2
6/17/2013 11:35:42 AM
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Re: Noise supression chip
>> Will there be a customizable noise supression IC in the future?

I think better process and good circuit will always triumph any attempt to get a customizable suppression IC as a product. We need to understand that most of the issues with ICs can be traced to immature process that is not reliable. And once the IC is stable, we upgrade to a new one and the whole thing continues.

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jbike
jbike
6/15/2013 9:29:24 AM
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Re: Noise supression chip
I could not agree more. MOST of the noise that I deal with is not perfect thermal noise or even gaussian for that matter. Rather, it is related to our love/hate relationship that we all have with the ubiquitous switching power supply. Number two in my book is noise related to the mixed signal aspect of nearly every circuit we  design these days. This worries me from an integration perspective, since this unwanted coupling both magnetic and electrostatic can be minimized by adding distance and/or guards... a precious commodity of which there is not much of on a silicon chip.  How many projects do you work on that are pure analog? I'd say few these days. Third on my hit list are external noise sources including power line related problems and noise from external equipment. Next we can discuss all the noise source that are in theory supposed to be statistical but turn out not to be so for a variety of reasons.

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Brad Albing
Brad Albing
6/14/2013 10:45:26 AM
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Re: Noise & resolution
Bonnie Baker has been discussing also - came up in this msg-thread:

http://staging.planetanalog.com/messages.asp?piddl_msgthreadid=15086&piddl_msgid=83966#msg_83966

 

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