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How to compute the SNDR in delta-sigma modulator?

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bagaseaotter

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How to compute the SNDR and DR in delta-sigma modulator? Does anyone has any efficeint way to get it?Thanks.
 

sankudey

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Hi,
You can go thru the following...having an Handbook on data converter...



sankudey
 

currentmirror2000

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use a single-tone sine wave, fin = fs/(2*bw*osr), collect output bit stream, e.g. 1-bit: +1, +1, -1, +1, -1, ... then do fft to look at the specturm and calculate the snr
 

mpig09

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Dear bagaseaotter :

You can use fft command in hspice for comparator output,



mpig09
 

gsuarez

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In general do a fft of the signal (remember fftshift) extract the fundamental signal power and sum the noise power. Then do Signal Power/ Noise Power. Check this MATLAB code:



George
 

Alan_yi

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thx! gsuarez

The matlab file is quite useful!
 

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