matlab线性度计算程序

环境

matlab2023a
ads2020

原理

其中f(v)是曲线，fmax是f(v)的最大值，fmin是f(v)的最小值，vmax为fmax对应v值，vmin为fmin对应v值。
L=∆fmax/(fmax-fmin) (1)
∆fmax=max⁡[f(v)-[fmin-K*(v-vmin)]] (2)
K=(fmax-fmin)/(vmax-vmin) (3)

代码

data1=importdata('schematic24.txt');%改变输入的文件名，文件数据的格式不一致需要自己调节
data2=data1.data; 
vt=data2(:,1); %X轴的数据  若不要前十个数据==》vt=data2(10:end,1); 若全部==》改为  vt=data2(:,1);
freq=data2(:,2); %Y轴的数据 若不要前十个数据==》freq=data2(10:end,2); 若全部==》改为  freq=data2(:,2);
vt1=min(vt):0.05:max(vt);
freq1=interp1(vt,freq,vt1,"linear");

K=(max(freq1)-min(freq1))/(max(vt1)-min(vt1));
DeltaFreq=abs(freq1-(min(freq1)+K.*(vt1-min(vt1))));
DeltaFreqMax=max(DeltaFreq);
L=DeltaFreqMax/(max(freq1)-min(freq1));%线性度

IdealCurve=(min(freq1)+K.*(vt1-min(vt1)));
plot(vt1,freq1,vt1,IdealCurve);
xlabel("Vt(V)");
ylabel("F(GHz)");
RelativeBandwidth=(max(freq1)-min(freq1))/(max(freq1)+min(freq1))*2;

输入数据

ads导出的Vt-f数据

Vt	f
4.00000000000000000E0	9.94315915744877721E-1
4.25000000000000000E0	1.01493151204090859E0
4.50000000000000000E0	1.03422490807067180E0
4.75000000000000000E0	1.05164280768404428E0
5.00000000000000000E0	1.06777990432062753E0
5.25000000000000000E0	1.08310328336644468E0
5.50000000000000000E0	1.09770768003155950E0
5.75000000000000000E0	1.11172932575729133E0
6.00000000000000000E0	1.12531380108596224E0
6.25000000000000000E0	1.13860792898479035E0
6.50000000000000000E0	1.15175718538421945E0
6.75000000000000000E0	1.16490578392067912E0
7.00000000000000000E0	1.17819886343963476E0
7.25000000000000000E0	1.19178584077378091E0
7.50000000000000000E0	1.20582289238475937E0
7.75000000000000000E0	1.22047052795578836E0
8.00000000000000000E0	1.23587824306338967E0
8.25000000000000000E0	1.25213803071271568E0
8.50000000000000000E0	1.26913562979576611E0
8.75000000000000000E0	1.28555359654201840E0
9.00000000000000000E0	1.30713158672056151E0
9.25000000000000000E0	1.32704294998017724E0
9.50000000000000000E0	1.34599061749011306E0
9.75000000000000000E0	1.36427848181836309E0
1.00000000000000000E1	1.38159593690375027E0

结果

可以看到线性度为4.29%。