Howtosignalprocessing
- What are the disadvantages of IIR filter?
- Why IIR filter is unstable?
- What are the limitations of IIR filter design by impulse invariance method?
- How do I know if my IIR filter is stable?
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.
Why IIR filter is unstable?
(a) Stable IIR filter, (b) The same IIR filter becomes unstable due to rounding effects. , one poles lie exactly on the unit circle (ie, it is just out of the region of stability) and hence it is an unstable IIR filter.
What are the limitations of IIR filter design by impulse invariance method?
The disadvantage of the impulse invariance method is the unavoidable frequency-domain aliasing. The Bilinear Transformation (Cont.) Notice that there is no aliasing effect with the bilinear transformation.
How do I know if my IIR filter is 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.
