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Delta Sigma Toolbox

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Delta Sigma Toolbox

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14 Jan 2000 (Updated )

High-level design and simulation of delta-sigma modulators

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Description

The Delta-Sigma Toolbox includes nearly 100 functions which support NTF synthesis, modulator simulation (from an NTF or a structure), realization, dynamic range scaling, SNR estimation and more. The toolbox is well-documented via the accompanying DSToolbox.pdf manual.

For further information regarding the Toolbox and Delta-Sigma modulators in general consider purchasing "Understanding Delta-Sigma Data Converters" by Schreier and Temes (ISBN 0-471-46585-2).

Acknowledgements

This file inspired Simulink Sigma Delta Toolbox, Data Weighted Averaging For Simulink, Delta Sigma Converter Spurious Tone Predictor, and Frequency Domain Min Max Optimization For Delta Sigma Modulators.

Required Products Control System Toolbox
Signal Processing Toolbox
MATLAB release MATLAB 7 (R14)
Other requirements Users should compile the simulateDSM.c and simulateESL.c files to speed up simulations.
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Comments and Ratings (115)
11 Aug 2014 shilpi

i have downloaded the sigma delta toolbox but unable to run simulateDSM.c file. it gives the error mex at 222, i have also update SDK and dotnet but still not working.please help me

15 Apr 2014 Byoung Kim  
11 Mar 2014 JF  
11 Mar 2014 Kong  
22 Feb 2014 Abhishek Bhat

Very useful toolbox for Delta sigma folks like us...

11 Jan 2014 achuth

It is very good

20 Dec 2013 pankaj jha

I am trying to implement a Band Pass Sigma Delta modulator SDM using delsig toolbox.

These are the MATLAB commands that I am running to get the modulator coefficients:
NTF = synthesizeNTF(4,320/(2*10),0,1.5*1,0.25);
STF = zpk([-1 , 1 , -1 , 1],[-0.2302 - 0.7241i , -0.2302 + 0.7241i , 0.2302 - 0.7241i , 0.2302 + 0.7241i],0.0976,[ ]);
[a,g,b,c] = realizeNTF(NTF,'CRFF',STF);
The MATLAB outputs:

a =

0.5558 0.2435 0.0436

g =

8.5267e-004

b =

0.1316 -1.0603 4.4905 0.3558

c =

1 1 1

This is wrong because there should be 4 coefficients for 'a' vector, whereas what we get only 3 coefficients for vector 'a' . Similarly is the case for vectors'b', 'c' and 'g'.

What could be possibly wrong?

19 Dec 2013 Dedong  
03 Dec 2013 liu  
20 Mar 2013 ding

Dear Richard Schreier,
I am a new man in deltasigma, so I follow your book" Understanding Delta-Sigma Data Converters by Schreier and Temes (ISBN 0-471-46585-2)" step by step, and I meet a problem "figure 8.4" and "figure 8.5" in page "265" and "266".
In your book, the SNR without window is "SNR = 76.4 dB @ OSR = 64",the SNR with window is "SNR = 119.2 dB @ OSR = 64".
But to my simulation, the result is "SNR = 86.1 dB @ OSR = 64" without window, "SNR = 85.7 dB @ OSR = 64" with window.
this is my code:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clear;
clc;
close all;

%synthesizeNTF
OSR= 64;
H= synthesizeNTF(5, OSR, 1);
nLev= 3;
Nfft= 2^ 13;
tone_bin= 57;
t= [0: Nfft- 1];
u= 0.5* (nLev- 1)* sin(2* pi* tone_bin/ Nfft* t);
v= simulateDSM(u, H, nLev);
n= 1: 150;
stairs(t(n), u(n), 'g');
hold on;
stairs(t(n), v(n), 'b');

%NTF simulation, SQNR cal and spectral estimation without window
spec = fft(v)/(Nfft*(nLev-1)/2);
snr = calculateSNR(spec(1:ceil(Nfft/(2*OSR))+1),tone_bin);
NBW = 1/Nfft;
f = linspace(0,0.5,Nfft/2+1); %this may be ahead?
Sqq = 4*(evalTF(H,exp(2i*pi*f))/(nLev-1)).^2/3;
figure; %add a new figure
plot(f,dbv(spec(1:Nfft/2+1)),'b')
hold on;
plot(f,dbp(Sqq*NBW),'m','Linewidth',1);
s= sprintf('SNR= %4.1fdB @ OSR= %2.0f\n', snr, OSR);
text(0.05, -20, s);

%NTF simulation, SQNR cal and spectral estimation without window
spec = fft(v.*(hann(Nfft)'))/(Nfft*(nLev-1)/4); %convert hann(Nfft) to vector matrix
snr = calculateSNR(spec(1:ceil(Nfft/(2*OSR))+1),tone_bin);
NBW = 1.5/Nfft;
f = linspace(0,0.5,Nfft/2+1); %this may be ahead?
Sqq = 4*(evalTF(H,exp(2i*pi*f))/(nLev-1)).^2/3;
figure; %add a new figure
plot(f,dbv(spec(1:Nfft/2+1)),'b')
hold on;
plot(f,dbp(Sqq*NBW),'m','Linewidth',1);
s= sprintf('SNR= %4.1fdB @ OSR= %2.0f\n', snr, OSR);
text(0.05, -20, s);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
I use matlab r2011b for windows 64bit;

30 Oct 2012 pankaj jha

I am trying to implement a SDM using delsig toolbox. The following are the commands I try to run, along with the errors.

H = synthesizeChebyshevNTF(2,12.5,1,1.5,0);
>> stf = zpk([],[],1,1) ;
>> [a g b c] = realizeNTF(H,'CRFFD',stf)
Error using /
Matrix dimensions must agree.

Error in realizeNTF (line 246)
a = -real(zL1/T);

Can you suggest me how to rectify the error???

10 Jun 2012 Maxim

Possible bug in function quantize() (file simulateDSM.c).
In saturate code:
if( vv > nLevels )
vv = nLevels-1;
else if( vv < -nLevels )
vv = 1-nLevels;

May be correctly:

if( vv > (nLevels -1))
vv = nLevels-1;
else if( vv < (1-nLevels) )
vv = 1-nLevels;

Regards,
Maxim

24 May 2012 macau

good thanks

02 Apr 2012 Zhao Li

To the folks having trouble compiling the Mex files on Windows with 64-bit Matlab (bizet74 perhaps?), you will need to define the '__STDC__' symbol. For example, to compile simulateDSM.c, you would do 'mex -D__STDC__
simulateDSM.c'

Regards,

Zhao

29 Mar 2012 pankaj jha

Respected Sir,

I am trying to simulate a sixth order sigma delta modulator using the
"Delta Sigma Toolbox".

1) My desired NTF is a 6th order Chebyshev type II high pass filter.
Hence, I ran the following command :
>> ntf = synthesizeChebyshevNTF(6,64,2,1.5,0)

The toolbox outputs the function given below:
Zero/pole/gain:
(z^2 - 2z + 1) (z^2 - 1.999z + 1) (z^2 - 1.998z + 1)
-----------------------------------------------------------------------
(z^2 - 1.629z + 0.6655) (z^2 - 1.705z + 0.7437) (z^2 - 1.854z + 0.8979)

Sampling time: 1

2) I wish to implement the above NTF using the "CIFB" structure. So
I ran the following command:
>>[a,g,b,c] = realizeNTF(ntf,'CIFB')
which gives the output
a =

0.0001 0.0013 0.0124 0.0794 0.3223 0.8120

g =

0.0002 0.0022 0.0012

b =

0.0001 0.0013 0.0124 0.0794 0.3223 0.8120 1.0000

c =

1 1 1 1 1 1

3) I tried to construct the "CIFB" structure using the coefficient
values provided by the toolbox, mentioned in the previous step.

4) I try to analyse the frequency content of the output (y2 in the
simulink file attached with this mail). I ran the following commands :
>> NFFT = 2^nextpow2(length(y2)); % Next power of 2 from length of y
>> Y = fft(y2,NFFT)/length(y2);
>> f = 300e6/2*linspace(0,1,NFFT/2+1);
>> plot(f,2*abs(Y(1:NFFT/2+1)))

5) The output is more like a low pass filter and not a high pass expected.

Hence, i request you to kindly have look at the .mdl file and the
commands executed by me, and help me find the mistake that I have
committed.

22 Nov 2011 Mike Woodward

If you're interested in this submission, you might also like the new, free mixed-signal library available from here: http://www.mathworks.com/programs/mixed-signal/index.html

23 Oct 2011 Kevin  
15 Sep 2011 Irfan Chaudhry  
30 May 2011 zhang fuquan

good job

12 Apr 2011 nont none

hi.how can i download dsp toolbox?

27 Mar 2011 Mohammad alhawari

@ bizet74
did u find how to solve ur problem coz am facing the same problem???

25 Nov 2010 Sridhar

Dear Dr. Schreier I am trying to use the toolbox to simulate a Sigma Delta Converter in Simulink. I was able to do it succesfully for a CIFF structure and now I am doing it for a CIFB structure.
Although I am able to simulate the Sigma Delta with the toolbox, it is unstable in Simulink.
Moreover I find that the CIFB topology shown in the manual is different as in this report (refer to figure 4 on page 5):
http://www.terasoft.com.tw/events/conference/2006/cfp/2006CFP_selected_Papers/3/3-2.pdf

My code is:
order=4;
OSR=545;
OPT=1;
H_inf=1.2;
ntf=synthesizeNTF(order, OSR, OPT, H_inf, f0);
[a,g,b,c]=realizeNTF(ntf, 'CIFB');
ABCD = stuffABCD(a,g,b,c,'CIFB');

Then I use the calculated a,g,b,c values in simulink.

best regards and thanks

Sridhar

26 Oct 2010 bizet74

Thanks for you answer but unfortunately this is what I usually do.
I have copied the toolbox in a directory (say c:\delsig) and I set this directory as the current Matlab directory and then I typed, for instance, mex simulateDSM.c and I obtained the afore mentioned errors.

26 Oct 2010 ASH VLSI

@ bizet74
hi friend
i faced same problem .... it can be solved by setting toolbox directory as matlab current directory and then giving the command

18 Oct 2010 bizet74

Hi!

I have some problems trying to compile simulateDSM.c, flattenStruct.c, and simulateESL.c. A part from several warnings I obtain these errors

simulateDSM.c(363) : error C2371: 'mexFunction' : redefinition; different basic types
C:\PROGRA~2\MATLAB\R2010A\extern\include\mex.h(147) : see declaration of 'mexFunction'

flattenStruct.c(27) : error C2371: 'mexFunction' : redefinition; different basic types
C:\PROGRA~2\MATLAB\R2010A\extern\include\mex.h(147) : see declaration of 'mexFunction'

simulateESL.c(547) : error C2371: 'mexFunction' : redefinition; different basic types
C:\PROGRA~2\MATLAB\R2010A\extern\include\mex.h(147) : see declaration of 'mexFunction'

I'm working with MATLAB Version 7.10.0.499 (R2010a) and Microsoft Visual C++ 2008 Express.

Does any one can help me?

Thank a lot in advance.

15 Oct 2010 ASH VLSI

can i model non idealities using this tool box ..........is it possible ????

07 Oct 2010 ASH VLSI

may i know how to use this tool box please .with some simple examples ...can anybody share it on my email :ashu9919@gmail.com

06 Sep 2010 yang shisong

I want to know how to use the toolbox,can you share me some example?thanks. my email:yssggh@126.com

25 Aug 2010 he shiqing

I got it.It's free to download ! I am sorry for misundstaning it

21 Aug 2010 he shiqing

how to buy the Delta Sigma Toolbox ????

03 Jun 2010 shaohuip ?

Thanks very much for your sharing. For quadrature band pass sigma-delta ADC design, when we use the synthesizeQNTF to get the NTF, then we can get the ABCD matrix by the realizeQNTF function. Finally how we can determine the coefficient like the [a,g,b,c] in low pass or band pass structure? Also for the quadrature structure, there is FF/FB/PFF/PFB, what is the difference between them and the previous CIFF/CIFB/CRFF/CRFB?
Thanks very much.

20 Jan 2010 Thierry Tambe

Outstanding Work. Exceptionally helpful in the simulations of SNDR versus DAC jitter, thermal noise and THD.

07 Jan 2010 Vishal Saxena

The delta-sigma toolbox by Dr Schreier is a mandatory tool for anyone serious about delta-sigma ADC design. The CT DSM extensions in the 2009 version look very useful and we will be evaluating them in a delta-sigma converter design course being taught at Boise State.
http://cmosedu.com/vsaxena/courses/ece697/s10/ECE697.htm

06 Jan 2010 Praveen Kumar

Can I access the older versions of this toolbox. I am particularly interested in the old documentation.

16 Sep 2009 zhang

Who can tell me, in the book "Understanding Delta-Sigma Data Converters ", in page 265,

1. spec = fft(v)/(Nfft*(nLev-1)/2),
why (nLev-1)/2 should be counted in to the spectrum computation?

2. Sqq = 4 * (evalTF(H,exp(2*pi*f))/(nLev-1)).^2/3,
why does 4/3 mean in this equation?

Thanks a lot!

18 May 2009 Payam

Dear Richard,

First of all many thanks for developing such a nice toolbox and authoring such a great book "Understanding Delta-Sigma Data Converters".
I am about to design a 4th order/10MHz BW/CT/Quadrature delta-sigma ADC.
Unfortunately, I couldn't find any function and demo regarding design and simulation of a complex filter in the delsig toolbox. I would be grateful if you inform me about any enhancement of this toolbox for designing complex DS ADCs.
Your time and consideration are appreciated in advance.

21 Apr 2009 Aztec Wei-Ting

When I download this toolbox and run synthesizeNTF.m, an error always comes out at line 209 and column 22. Does any method to solve this problem? Thank you very much!

06 Feb 2009 Ras123 V  
26 Jan 2009 Quan

it's my mistake. it's the total power in the signal bins to the total power in the noise bin.

26 Jan 2009 Quan

Thanks for such a useful tool box. I have a question of SNR calculation.
In the tool box, the function, caltulateSNR,is used to approximate in-band signal power and noise power, and then SNR is calculated. the codes are as follows:
signalBins = [f-nsig+1:f+nsig+1];
signalBins = signalBins(signalBins>0);
signalBins = signalBins(signalBins<=length(hwfft));
s = norm(hwfft(signalBins)); % *4/(N*sqrt(3)) for true rms value;
noiseBins = 1:length(hwfft);
noiseBins(signalBins) = [];
n = norm(hwfft(noiseBins));
if n==0
snr = Inf;
else
snr = dbv(s/n);
end

My question is: Since the length of signal bins and noise bins are totally different, how can signal power and noise power be substituted by
s = norm(hwfft(signalBins)) and n = norm(hwfft(noiseBins)), respectively.
I think the signal power and noise power should be like s = norm(hwfft(signalBins))*(4/N*sqrt(length(signalBins))) and n = norm(hwfft(noiseBins))*(4/N*sqrt(length(noiseBins))), respectively.
May be I'm wrong. But i'm really confused.

29 Sep 2008 sandy sandy

After u download how to u run the files.always error is occuring

29 Aug 2008 lu yan

I doenloaded this toolbox,but now I have a question.when i run synthesizeNTF.m,an error always comes out in 209 line.Browsing a lots of forum ,I find that the question is very popular.I expect you give a way to the problem,thank you from my heart!looking forword to your letter!

23 Jul 2008 Lars Sundström

A significant contribution to the mixed-signal community around the world.

09 Jul 2008 Xu YanFeng

very good

05 Jul 2008 Liu qiuliang

very good!

29 Jun 2008 shifei hu

very useful?Thanks Very much!!

04 Jun 2008 zhang dongqing  
04 Jun 2008 zhang dongqing

It is very useful for the filter design, thanks

13 May 2008 Aren aren00

Very good!

29 Apr 2008 Mareers Samuel

Thanks for useful toolbox.Is it compatible with
matlab clones liek Scilab n Octave.If not wat are the modifications required??

22 Apr 2008 di li

Thank you very much!!!

17 Apr 2008 swathi y  
16 Apr 2008 Xiaodong Guo  
05 Mar 2008 Sha Xia  
03 Mar 2008 shi huan dong

excellent

21 Jan 2008 preeti chauhan  
02 Jan 2008 Yi WANG

The matlab code is:

OSR=128; %over sampling rate

order =2; %the order of SDM

ntf0=synthesizeNTF(order,OSR,1); %create the optimized ntf.
stf0=ntf0; %copy the ntf to stf, so that they will have the same poles.
stf0.z=[]; %set the numerator of stf to 1.

form='CIFF';
[a,g,b,c]=realizeNTF(ntf0,form,stf0);

02 Jan 2008 Yi WANG

I have a problem of using function "realizeNTF", if I set the "stf" has the same poles as "ntf" and use it as the input for the fucntion. Matlab tell me that:
??? Error using ==> mrdivide
Matrix dimensions must agree.

Error in ==> realizeNTF at 327
b = real(x/A);

Error in ==> Test_7755_NTF_Cap2 at 10
[a,g,b,c]=realizeNTF(ntf0,form,stf0);

26 Dec 2007 Senthil raja

If zpk is properly modified, this software should be user friendly.

26 Dec 2007 Senthil raja

If zpk is properly modified, this software should be user friendly.

15 Dec 2007 Ramesh Singh  
29 Nov 2007 HUA Siliang

Thank you for your toolbox. I am reading your book.

22 Nov 2007 Luiz Carlos  
14 Nov 2007 Jhoule Houke

Thank you very much.

07 Nov 2007 Sushi Taro

I like sushi very much.

29 Oct 2007 Shimon Dahan

Need more examples for designing SD structure include it's coefficients.

12 Oct 2007 mopaditis Aeolus  
12 Aug 2007 Jitendra Das  
25 May 2007 melika roknsharifi

Dear Richard Schreier
Thanks for your exellent book on delta sigma and this complete toolbox

24 Mar 2007 Doreen wang

First,I use this tool to get the coefficients of a fifthe-order sigma delta modulater.And then I made a model in simulink with these coefficients.Then filter the modulated signal with a lowpass analog filter,I could not get the original signal.I found that the third order coefficients can get the perfect results in simulink.why?Thanks.

02 Jan 2007 Steven Lin  
05 Nov 2006 Song-Bok Kim

Dear Richard Schreier. Thank you for your dela sigma toolbox. I want to know if by your toolbox it is possible to simulate Continuous-time quadrature bandpass sigma-delta modulator. And if possible, please tell me how to use. Next,I kow how to simulate the feedforward summing topology without input feedforward with which feed only first stage integrator.
I look forward your reply this week.

03 Nov 2006 Song-Bok Kim

I don't know yet how to use the Delta Sigma Toolbox. Firstly, I want to inform how to use
in Matlab simulink

11 Oct 2006 Bingxin Li  
08 Oct 2006 Wayne Huang

Good! helpful.

31 Aug 2006 mehrdad yadollahi

it's good

31 Aug 2006 mehrdad yadollahi

fair

28 Aug 2006 Oscar Gaete

Dear Richard,
thank you for your toolbox. It looks very impresive.
I have one questions:
if I sample 1 second audio with 8000 Khz I will get a variable with 8000 points(i.e. >>x=wavrecord(8000,8000);)
when I simulate the output of a delta sigma modulator (when the input is x) with OSR=64 the output signal has a length of 8000. Why is that?...shouldn't it be 512000 because of the oversampling?)
Thank you.

15 Aug 2006 noha zaki

I have a simply question,like Jacob, how to initialize this toolbox in matlab?What steps should I take to use Sigma Delta modulator?I only need to give as an input some signal (ex.sinus)and observe an output as a spectrum...Thanks for answer

02 Aug 2006 xin xn

sigma-delta box

05 Jun 2006 Jacob J

I have a simply question, maybe somebody will be laughing:), but how to initialize this toolbox in matlab?What steps should I take to use Sigma Delta modulator?I only need to give as an input some signal (ex.sinus)and observe an output as a spectrum...Thanks for answer

18 Apr 2006 mehmet ozcelik

gaziantep university

11 Nov 2005 Marshnil Dave

I am trying to simulate a basic Boser and Wooley Sigma Delta modulator
in matlab. The SNR calculated using calculateSNR function of SDMtoolbox
doesn't give proper results and as STF of this B&W architecture is not
unity I am unable to simulate it using simulateSDM function of SDM
toolbox. I request you to guide me simulating second order B&W SDM in
matlab and predicting the SNR correctly.

11 Nov 2005 Marshnil Dave

I am trying to simulate a basic Boser and Wooley Sigma Delta modulator
in matlab. The SNR calculated using calculateSNR function of SDMtoolbox
doesn't give proper results and as STF of this B&W architecture is not
unity I am unable to simulate it using simulateSDM function of SDM
toolbox. I request you to guide me simulating second order B&W SDM in
matlab and predicting the SNR correctly.

28 Oct 2005 David Kiriev

RE: current mirror

Don't copy everything from the book. He was a professor at Oregon State U. when he created the toolbox -- Professors don't test their codes, the graduate students do.

He just took whatever results or claims that his student gave to him...You have to try testing every code by yourself since you're not a professor :)

David Kiriev

02 Oct 2005 current mirror

seems i do not get the same simulation results and SNR value as the book written by the author (page 264, 265); anyone got the same problem?

27 Sep 2005 jason Fong

so smart one

19 Aug 2005 jeffrey zhu

excellent toolbox for sdm design, realizeNTF function for CIFF topology seems not correct though.

19 Aug 2005 Mucahit Kozak

Excellent toolbox. Essential for the design of sigma delta modulators.

08 Jul 2005 Zejian cai

>> H=clans(5,32,5,0.95,1)
??? Error: File: D:\st\delsig\clans6.m Line: 35 Column: 37
"identifier" expected, "(" found.

Error in ==> D:\st\delsig\clans.m
On line 19 ==> NTF=clans6(order,OSR,Q,rmax,opt);

I just do it as document says. what's wrong?

08 Jul 2005 Zejian cai

always error as following when run dsdemo6.m, who can tell me why? please
??? Undefined function or variable 'firpm'.

Error in ==> D:\st\delsig\designHBF.m (designF1)
On line 119 ==> h = firpm(2*n1-1,[0 4*fp1 1 1],[1 1 0 0]);

Error in ==> D:\st\delsig\designHBF.m
On line 42 ==> [f1 zetap phi] = designF1( delta, fp1 );

Error in ==> D:\st\delsig\dsdemo6.m
On line 19 ==> [f1,f2,info]=designHBF(fp,delta,1);

04 Jul 2005 Leon hong

Can I use this toolbox to simulate digital D-S modulators in DAC?

28 Jun 2005 manu suryavansh

i am not able to download

28 Jun 2005 z.z. dong

The file firpm.m is missed when i run designHBF.m program in the matlab 6.5 R13 software. please give some suggestions if possible

26 Jan 2005 C. HO

The calculateSNR.m is a good approximation, but might have problem when the number of points considered increased.

24 Jan 2005 C. HO.

Organization can be improved further.

04 Jan 2005 Acuti Yang  
23 Aug 2004 M. Praveen

its good

25 Jul 2004 ken vin kuo

no

14 Jun 2004 OLL Tsai

good!

07 Jun 2004 Mehdi Banihashemi  
13 Apr 2004 Naughty Boy

Very good. But just failed to compile the simulateDSM.c under Linux Matlab 6.5, always says that the file is not normal or not existed. For Window Matlab, it is okay.

11 Feb 2004 Fakhs Huss  
05 Feb 2004 kareem abdallah  
25 Jan 2004 Mohammad Yavari

Very useful tool to design high order single loop SD modulators
It will be nice if this toolbox is added in the next versions of MATLAB.

24 Sep 2003 Lin Chuck

I need the synthesizeNTF and CLAN original document

05 Jun 2003 Sumant Bapat

Nice tool. Makes life of novice delta sigma designer easy

14 Feb 2003 guillaume de cremoux

Very good when modulator order greater than 3; otherwise the famous "0.5" coefficients do the same job. When very low OSR (<32), filter refinement does not flatten enough the NTF. Excellent tool at medium OSR, and high modulator order.

11 Feb 2003 Esmaeil Najafiaghdam  
10 Jan 2003 Mark Brunner

It does what it should... thanks.

07 Jan 2003 Gary Mai

Excellent Work. It will be great help to design sigma-delta modulator, especially in system level.

07 Jan 2003 Leo Montreuil

Great tools for design Delta-Sigma modulator

03 Dec 2002 Paul Muller

Very useful, not only for understanding, but also for system-level simulation for IC design

01 Jan 2002 Anas Hamoui

Great work ... thank you.

07 Dec 2001 June sh

It's a well done work!
Thank u!

Updates

Mathworks changed the internal representation of the zpk object in
7.3.0.298 (R2006b), and this caused segmentation faults when simulateDSM or simulateESL were called with zpk arguments. These functions have been updated to fix this problem.

modifying description

06 Jan 2003

Expanded functionality and updated for Matlab 6.

13 Dec 2004

Updated clans.m so that it works with old and new versions of the Optimization Toolbox. Corrected the documentation for designHBF.m

06 Jul 2009

Added functions for realizing an NTF with a continuous-time loop filter and for handling quadrature modulators.

29 Dec 2011

Incorporated Jeffrey Gealow's improvements which remove restrictions on the tdac argument in realizeNTF_ct and mapCtoD. Values such as [1 3] or [2 3] are now OK.

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