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Altera_Forum
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17 years ago

IIR filters in FPGA

The problem is as follows: - we have a need for a low pass IIR filter (minimal delay - low order) - used type of filter is Elliptic - generation of the filter is in Matlab fdatool - characte...
Altera_Forum's avatar
Altera_Forum
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17 years ago

For fixed point arithmetics it's recommended a Type III structure (Transpose-Form IIR Filter Structure) or a cascade of second order stages (as suggested by fda tool). I have implemented stable 13-order filters using 8 bits just with a Type III Structure.