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cenyunyun
Joined: 02 Mar 2006
Posts: 9
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 02 Mar 2006 4:29 snr |
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hello,
Now, I am designing a delta-sigma DAC. But don't know how to simulate the performance of the delta-sigma modulator like SNR.
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tiger_shark
Joined: 21 Feb 2006
Posts: 51
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03 Mar 2006 7:08 Re: snr |
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Hey,
It has been a while since I dealth with sigma delta converters. However, I believe, that a typical way to measure SNR (at least in MATLAB simulation,and in IEEE papers) is to use a single-tone sine wave with amplitude equivalent to half of full-scale dynamic range of s/d converter and with frequency equivalent to half passband width. Then measure the peak single tone in the spectrum of output and compare it to the level of the noise in your pass-band.
Regards,
TS
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cenyunyun
Joined: 02 Mar 2006
Posts: 9
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03 Mar 2006 11:24 Re: snr |
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To Tiger-Shark:
Thank you, first. I have already studied some IEEE papers and roughly known of SNR. But I don't know whether I should design DSM module using Matlab and simulate it using simulink. If I should do it, I can't get the data from the result of simulink and so I can't caculate SNR. Can you tell me whether my way is wrong?
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svensl
Joined: 25 Mar 2005
Posts: 101
Helped: 1
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03 Mar 2006 15:11 Re: snr |
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Doing SDM simulations in Matlab is quite easy. When I started I had a look at already existing models. They helped me get started and to develop my own models.
You can download some examples from:
http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=2460&objectType=file
Just work through the matlab code and you'll see how to calculate the SNR.
Also, when you do a search on the board you will find complete matlab routines posted on how to calculate SNR, THL, SFDR......
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Google
AdSense
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03 Mar 2006 15:11 Ads |
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Alan_yi
Joined: 15 Feb 2006
Posts: 21
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09 Mar 2006 17:58 snr |
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Hi, svensl
Is there anyone using matlab to build a model for continuous time sigma-delta modulator?
Added after 2 minutes:
A lot of people use spice model directly to simulate continous-time SD modulator. I am wandering whether it is effective to do so.
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feel_on_on
Joined: 29 Apr 2005
Posts: 260
Helped: 1
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01 Jun 2006 9:04 snr |
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| do i get SNR according to ouput frequency-amplify?
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