Alan_yi said:As the title
I will start the modeling work on several topogies of the sigma-delta modulator in order to compare the performance of the single loop, cascaded, lesilie-sign structure.And all of them will be realized in continuous-time domain.
At first, I want to use matlab to set up these models, but it seems that matlab is not suitable for the continuous time SD.Most people use spice to do the job.
Is there any exsiting continous time SD model that could be used as a reference?I am wandering why matlab can't do the job and how to start the continous-time SD modeling work(any good paper on it?).Thx!
grobar said:I've implemented CT SD in matlab, not using simulink cause I wanna see exactly what's happening when you "play" with parameters.
Simulation is really pain in the ass especially when you want to calculate the integrator coefficients !! It takes a looooooooooot of time cause feedback factor has to be updated every time(after each period T):
fbfactor*(heaviside(t-begin_pulse)-heaviside(t-end_pulse)) if you use rectangular DAC pulses ...I'm doing this for 3rd order single loop 1 bit (and 4 bit) CT SD. I'm using square waves and also exp. pulses for DAC for RZ as well as NRZ. Number of samples is 8192=2^13.
I have FB,FF and hybrid toplogies implemented,for RZ and NRZ,square waves and exp. .
I didn't go from DT to CT , to calculate the coefficients cause that's already been done... I've started in CT using matlab symbolic toolbox & using maple commands.
Hybrid topology using exp. pulses has never been published in any papers + I plan to see the effect of jitter ...
Anyway good luck to you, it's a lot of fun but also a lot of blood ,sweat and tears lol...
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