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Altera_Forum's avatar
Altera_Forum
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12 years ago

FIR interpolator

Hello guys !! I'm trying to understand the FIR compiler interpolator. I have a complex signal clocked at X MHz. Now I want to have it interpolated by a 3x factor so that the output frequen...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Because doesn't need a narrower filter.

If I want a 4x interpolation in one stage I need a LPF whith f_stop= 4f_in/8, viceversa If I do it in two stage I need f_stop=2f_in/4 for every stage. Right ?

By the way I think that the sample rate to be specified in the fir compiler megawizard is referred as the output sample rate. In fact if you choose interpolation by two and set the sample rate at 30MHz the wizard will set f_stop=7.5MHz.