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Filtering on the Red Pitaya

Part 2: IIR filters

Filtering on the Red Pitaya
In the first part of the series we got to know the FIR filter, which has the disadvantage that it becomes rather cumbersome when we want to implement a filter with a sharp frequency response. More frequently filters with demanding specifications like this are implemented as IIR (infinite impulse response), or ‘recursive’, filters. Here we will look at how IIR filters can be designed and implemented in FPGAs.
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