[SI-LIST] Re: Measuring Power supply noise
- From: Hal Murray <hmurray@xxxxxxxxxxxxxxx>
- To: design97@xxxxxxxxx
- Date: Tue, 21 Mar 2006 09:38:07 -0800
> Well I'm trying not to use all these passives and just ONE ADC chip to
> measure noise.
> Again original question remains, Any critic to this idea?
You are jumping out of a nice comfortable frying pan into a raging inferno.
How many passives do you think it will take to make your ADC work?
What sort of sample rate and how many bits do you want? Have you looked at
any data sheets or app notes? (Try TI and/or Analog Devices. Both have good
web sites.)
You can get ADCs in tiny packages, but those chips are only useful for
measuring the (average) DC voltage rather than measuring the noise on a power
rail.
Other considerations: Where are you going to get the clock for it? How are
you going to collect the data that comes out of it?
We really are fortunate that the scope companies are making such wonderful
gear. I often wonder what they use to debug/test their top of the line
products.
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