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Thread: [EE] 24-bit A/D. Are We in the Twilite Zone Here?
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face BY : Plunkett, Dennis email (remove spam text)



In this case your attempting to average out the LSB. Note that this is only
an advantage as the noise is nominaly equivalent to the LSB. While on this
matter we must also consider the noise source. In an ADC the noise generated
is ((1/root 12) * the LSB) (Noise typically has peeks 6 to 8 times the
average!) so this is the base noise floor of the ADC (General term). From
this we can see if the noise on the signal is greater than or less than
(Remember that noise is adative not subtractive)
Back to the original LSB stuff.
What we are attempting to do is to find the LSB value. Note that the ADC
qunatizes the sample so that it is to the next lowest LSB value. Thus if tou
are .1LSB lower then the result will be 0.1LSB less, however normal rounding
would consider this as 1LSB more!



Dennis




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Subject (change) [EE] 24-bit A/D. Are We in the Twilite Zone Here?

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