hi anyone around can help me with my digital portion.. i've been stuck for 2 week unable to get my decimation filter up .. need advice and guidance and examples if any of u have.. really appreciateView attachment 85271View attachment 85272
simulation stop time = 0.03
input sine signal = Amp= 12, Freq=2*pi*60
Clock period=1/7680 (oversampling of 64 times)
rate transition output sample time =1/7680
i've just add a FIR decimation block using dialog parameter coefficient
fir filter coefficient = fir1(35,0.015) <-- i dont understand this part so i just add random numbers
decimation factor = 8 <--- i tried change to decimation factor of 16 my waveform even more jagged.
end up i got the output(bottom waveform) is delayed by 90 degree as compare to the original sine wave(top waveform). what/how to remedy this?
how do i use multirate filter object (MFILT)??
In red are my queries. who can guide/teach or maybe show me some examples on how to make the filter
Hi Dan,
thanks for your comments. but i think you have mistaken me. i was not given any specification from this DSM. I was task to create a simulation on a 1st order delta sigma ADC. After viewing from this forum then i know that i needed a more precise specification for my project. which later i posted eariler "my initial specification". that specs is purely from my newbie understanding of SDM, so i'm asking around if that specs i drafted out is workable??
i will try to get the reference book u introduce. thanks any other references that might aid me with better understanding DSM ADC design?
Dawson
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