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Altera_Forum
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13 years ago

band pass FIR filter and weird response

Dear all, I have used altera quartus 12.0 FIR II compiler to generate a bandpass filter. The filter uses 11bits coefficients with 17bit data entry and has 80 taps. I put all that into sim...
Altera_Forum's avatar
Altera_Forum
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13 years ago

Kaz: yes, I've verified this. the impulse response seems to be correct within given 11bits..

FvM: this is interesting comment, but I'm not sure whether I understand your comment. Could you extend it a bit more? My input vector is 16 bits (sorry for my first post where I mistakenly said 17). The filter output vector is 34 bits long (33 downto 0) signed. Hence output 65534 does change 16 lsbs on already 34-bit long 'signed' type. Where did you get 2LSB error?

Thanks

.d.