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Maithil Pachchigar

Increase Dynamic Range with SAR ADCs Using Oversampling, Part 2

Maithil Pachchigar
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Victor Lorenzo
Victor Lorenzo
11/27/2013 4:40:03 AM
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Blogger
Re: Oversampling vs. Undersampling
I've found cases where input signal has a very high bandwith compared to the application bandwith of interest and the signal conditioning amplifiers and filters are not sharp enough to limit those high frequency signals. Keeping the aliasing noise under some reasonable level was a must and adding more high order analog filters was not suitable.

In one of those cases it was enough oversampling the input signal, real-time filtering (FIR, in that case) and downsampling the filtered data before passing it to all of the rest of the real-time processing algoritms.

--Victor

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samicksha
samicksha
11/26/2013 1:08:51 AM
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Student
Re: Oversampling vs. Undersampling
Also to add that without oversampling, it is very difficult to implement filters with the sharp cutoff which are required to maximize use of the available bandwidth without exceeding the Nyquist limit, any experiance or feedback on Noise factor..

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JAYARAMAN KIRUTHI VASAN
JAYARAMAN KIRUTHI VASAN
11/25/2013 1:45:13 AM
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Master
Over-sampling
Maithil,

We have used an in-built ADC of a MCU for oversampling. The available resolution was 10 bits and we could get upto 12 bit. It was a pressure sensor signal.

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DaeJ
DaeJ
11/22/2013 10:14:34 PM
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Master
Oversampling vs. Undersampling
Getting more data provides more accurate resolution for system. But I think that in some application such as temperature measurement which is slowly changing to voltage, undersampling would be an appropriate choice.  I wonder that oversampling and undersampling would be used simultaneously depending on multiple signal bandwidths and multiple frequencies.    

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