清空筛选条件
清空筛选条件

Can it be so hard to estimate a simple transfer function?

1 次查看（过去 30 天）
Daniel H
Daniel H 2016-6-7
编辑： Daniel H 2016-6-7
I have bode plot data from a circuit simulator (Cadence SpectreRF). To first order, the system should be an integrator but it has much high frequency stuff going on. According to the simulator's .pz analysis (estimation), it has 17 poles and 14 zeros.
I use 100 points per decade in my data (which is a lot).
Now no matter which number of poles/zeros I take, this ftest function just gives garbage:
gfr = idfrd(vod.V, 2*pi*vod.freq, 0);
save gfr;
figure, bode(gfr, tfest(gfr,3,2));
(blue: original data, red: estimate; see code).
Am I doing something wrong? Can it be so hard to estimate a simple transfer function?
For reference: Here is the gfr object data with the data: https://www.dropbox.com/s/zn3pkz9ckihjdbl/gfr.mat?dl=0

请先登录，再回答此问题。

回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Linear Model Identification 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by