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Slewing vs. linear settling in MDAC (Read 2166 times)
carlgrace
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Slewing vs. linear settling in MDAC
Jun 15th, 2010, 5:39pm
 
Hi, I've got another question.

I haven't been able to find a good discussion of how to decide how much of the settling time to allow for slewing in a pipelined ADC MDAC.  The obvious impact of slewing is that it allows less time for linear settling.  Is there more to it that that, though?  Assume I have an op amp that can settle much faster than I need for the sampling rate.  Then, can I lower the slew rate to save power, since even though there is less time for linear settling it can still handle it?

Will something go wrong if I use have the settling time for slewing?  Or 10%? or what?  It seems to me if your settling time is fast enough you should be able to slew up a storm.

Carl
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Mayank
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Re: Slewing vs. linear settling in MDAC
Reply #1 - Jun 16th, 2010, 10:00pm
 
I am not much sure abt this, BUT
Isn't Slweing + Linear Settling gonna distort your signal ?
& eventaully appear as THD ??
Happens in DACs, not sure abt ADCs.
That's why we make one of the phenomena dominant.
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