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ArthurDent's avatar
ArthurDent
Icon for New Contributor rankNew Contributor
6 years ago

FIR Filter II, not able to get unity gain

Hi I have designed a 26 taps FIR filter in Matlab. The coefficients are float (between -1 to 1) and the sum of the coefficient is close to 1 ( sum(taps) = 0.9991 ). In FIR II IP generator (Quartu...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
6 years ago

Hi AD,

For your information, I have had some discussion with peers on this. Based on our discussion, the your undersing on the calculation on the full output range and the number of bits for representing sum of coefficients seems correct.

Regarding your specific inquiries on the MSB and LSB to remove, sorry as I do not have much insight into this and thus might not be able to provide any helpful comment. As a workaround, it is recommended for you to try with different truncation in simulation to see if can achieve your target requirement. Sorry for the inconvenience.

Please let me know if there is any concern. Thank you.

Best regards,

Chee Pin