engrMunna
Advanced Member level 4
Hi. I am trying to find a transfer function for a 2nd order sigma delta modulator using the sigma delta tool box in matlab.
using the following code
ntfo =synthesizeNTF(2,512,2,1.5,0) %%%synthesizeNTF(order,osr,optimization,Hinf,f0);
[ABCDc,tdac2] = realizeNTF_ct( ntfo, 'FB', tdac);
[Ac Bc Cc Dc] = partitionABCD(ABCDc);
sys_c = ss(Ac,Bc,Cc,Dc);
sysf = tf(sys_c)
the output that I get is
Transfer function from input 1 to output:
0.2164
------
s^2
Transfer function from input 2 to output:
-0.6667 s - 0.2164
------------------
s^2
What I dont understand is what does it mean by input 1 and input 2 ? why are there two inputs ? is the second input the quantization noise? please help thanks
using the following code
ntfo =synthesizeNTF(2,512,2,1.5,0) %%%synthesizeNTF(order,osr,optimization,Hinf,f0);
[ABCDc,tdac2] = realizeNTF_ct( ntfo, 'FB', tdac);
[Ac Bc Cc Dc] = partitionABCD(ABCDc);
sys_c = ss(Ac,Bc,Cc,Dc);
sysf = tf(sys_c)
the output that I get is
Transfer function from input 1 to output:
0.2164
------
s^2
Transfer function from input 2 to output:
-0.6667 s - 0.2164
------------------
s^2
What I dont understand is what does it mean by input 1 and input 2 ? why are there two inputs ? is the second input the quantization noise? please help thanks