How to compute the SNDR in delta-sigma modulator?

[bagaseaotter]

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

 

[sankudey]

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



sankudey

 

[currentmirror2000]

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]

Dear bagaseaotter :

You can use fft command in hspice for comparator output,



mpig09

 

[gsuarez]

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]

thx! gsuarez

The matlab file is quite useful!