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Altera_Forum
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15 years ago

Unwanted offset attenuation in FIR filters

My FIR is now working so far - thanks to Altera Guru "MSchmitt" - but I still have two problems left. Please have a look at the attached pictures - there is an unwanted offset attenuation of 6dB in t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I'm not an expert but wonder if you are able to simulate your digital filter behaviour.

If running a simulation with a constant input, you see it lowered, then it depends on the FIR filter.

Further the simulation can tell you which is the correct format of the output (MSB representation etc.)

Otherwise, can it be the DAC?

hope this helps.