FIR bandpass filter in labview

[shirin91]

hi

i am trying to pass digitized data with three frequencies component (80MHz,100Mand 120M) through FIR bandpass filter. the result from output filter shoud be 100M but still i have two others frequencies with lower amplitude which are not suitable for my next steps. i have attached my designed filter specifications and the input/output frequencies.

can anyone help please.

thanks

[PsyenceFact · Accepted solution]

Hi shirin91,

Your graphs show the 80 and 120 MHz components have been attenuated by about 25 to 30 dB.  This looks about what you'd expect from the filter design shown.  I'm no filter expert (and have never used the filter design tool) but surely you need to increase the stopband attenuation if you want to reduce these components further?

Andy

[shirin91 · Accepted solution]

hi Andy

problem solved . thanks a lot for your help.

regards