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ab_ba
Joined: 29 Apr 2007
Posts: 21
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 29 Jun 2009 14:52 fft calculation |
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Hi all;
i have designed two sigma delta modulators one that has a 1bit quantizer and other has a 5bit quantizer, without the design of output filters how can i calculate the FFT of the output of each modulators for achieving power spectral density?
Regards
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29 Jun 2009 14:52 Ads |
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ark5230
Joined: 29 Jun 2009
Posts: 188
Helped: 15
Location: India
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29 Jun 2009 23:21 fft calculation example |
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Could you elaborate further !!
Regards
Raoof
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willdoit
Joined: 10 Jun 2009
Posts: 17
Helped: 2
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01 Jul 2009 4:31 Re: FFT calculation |
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| Are you worried about aliasing occurring in sampling you need to do to perform FFT?
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ab_ba
Joined: 29 Apr 2007
Posts: 21
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02 Jul 2009 4:43 Re: FFT calculation |
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I don’t understand sigma delta in detail because I work in another field. But from there I wanted to test an idea for sigma delta and saw that is feasible or not (by matlab simulink). My problem is in fft calculation because the output of sigma delta modulator is different from other types of ADC.
Regards
AB
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ark5230
Joined: 29 Jun 2009
Posts: 188
Helped: 15
Location: India
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02 Jul 2009 19:01 Re: FFT calculation |
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If you can explain what data you are handling, like numerical data of the plot or the plot itself, it will help one to come out with a solution that can be of your help.
Regards
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ab_ba
Joined: 29 Apr 2007
Posts: 21
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05 Jul 2009 18:05 Re: FFT calculation |
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Hi All;
I'm thanks from all. my problem are solved whit a m file in
http://www.circuitdesign.info/blog/2008/09/corrected-response-to-edaboardcom-question-adc-in-matlab-simulink/
Regards
AB
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