Howtosignalprocessing
- Why IIR filters are not reliable?
- What are the disadvantages of IIR filter?
- Can IIR filters be stable?
- Can IIR filter be designed without analog filters?
Why IIR filters are not reliable?
The bad of IIR: IIR filters can become unstable. For an impulse response, the output of an FIR will always settle back to 0. IIR filters have a feedback loop so they will accumulate rounding and noise error.
What are the disadvantages of IIR filter?
The disadvantage of IIR filters is the nonlinear phase response. IIR filters are well suited for applications that require no phase information, for example, for monitoring the signal amplitudes. FIR filters are better suited for applications that require a linear phase response.
Can IIR filters be stable?
The stability of an IIR filter can be analyzed by the zero-pole plot of the filter's transfer function. A digital filter is stable if and only if all the poles of the irreducible filter transfer function lie inside the unit circle in the z plane.
Can IIR filter be designed without analog filters?
No analog equivalent: using the Bilinear, matched z-transform (s-z mapping), an analog filter can be easily be transformed into an equivalent IIR filter. However, this is not possible for an FIR as it has no analog equivalent.
