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William K.
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Platinum
Re: What do you mean by greater sensitivity to noise/
William K.   7/2/2013 6:25:35 PM
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It seems to me that there is a bit of charge injection going to occur and that it may contribute to some forms of noise. That is my understanding of how at least some of the switching filter noise is created. There are probably a few other mechaniss as well. 

Tom M.
User Rank
Silver
Re: What do you mean by greater sensitivity to noise/
Tom M.   7/2/2013 12:57:58 PM
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OK I thought you were referring to sensitivity to noise on the input signal, that should be the same as a continuous time filter.  (Assuming it's under 1/2 the clock frequency.)

Tom M.

Jon Titus
User Rank
Blogger
Re: What do you mean by greater sensitivity to noise/
Jon Titus   7/2/2013 12:14:01 PM
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Because a lot of switching occurs within the IC and in surrounding circuits, you can get more noise on the output than you would with op-amp-based filter circuits.

Tom M.
User Rank
Silver
What do you mean by greater sensitivity to noise/
Tom M.   7/2/2013 10:25:05 AM
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Hi Jon,


What exactly do  you mean by "They exhibit greater sensitivity to noise than their op-amp-based filter siblings"?


Tom M.

Donnwick
User Rank
Iron
Filter test
Donnwick   7/1/2013 5:37:28 AM
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This was one of the nice way to replace the resistors and it was also very interesting to know about it.

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