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衬底对量子点性质影响计算。。。。。。。。。。。。。。。

fp=10;
fs=30;
Fs=1000;
rp=3;
rs=30;
wp=2*pi*fp/Fs;
ws=2*pi*fs/Fs;
Fs=Fs/Fs;
wap=tan(wp/2);
was=tan(ws/2);
[n,wn]=buttord(wap,was,rp,rs,'s');
[z,p,k]=buttap(n);
[bp,ap]=zp2tf(z,p,k);
[bs,as]=lp2lp(bp,ap,wap);
[bz,az]=bilinear(bs,as,Fs/2);
[h,w]=freqz(bz,az,256,Fs*1000);
plot(w,abs(h));
grid on;