Hello I'm a beginner with Matlab and need help designing a filter

I was thinking of doing a 4th order Butterworth bandpass filter with center frequency of 455KHz and bandwidth of 100KHz. The passband gain should be 10dB

Answer 1

[Peter]

Have you started with this?

https://www.mathworks.com/discovery/filter-design.html

Also

filterDesigner

is a good tool.

[James]

I haven't started. I've just been reading on the topic alot but I'm not doing too good. Do you have an idea how to start the code or an example

[Peter]

Try the filterDesigner

There are a lot of tradeoffs when designing filters, and you will need to play with the tool to optimize for what you need.

[James]

[A,B,C,D]=butter(10,[395 405]/750);
d = designfilt('bandpassiir','FilterOrder',4,...
    'HalfPowerFrequency1',395,'HalfPowerFrequency2',405 ...
    'SampleRate',1500);
sos=ss2sos(A,B,C,D);
fvt=fvtool(sos,'Fs',1500);
legend(fvt,'butter','designfilt')

[James]

I'm getting this error message

   'SampleRate',1500);
       ↑
  Error: Unexpected MATLAB expression.