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Dirty derivative stability in the frequency domain (2305.08737v1)
Published 22 Apr 2023 in math.OC, cs.SY, and eess.SY
Abstract: Differentiation filters can be made proper by composition with a first-order low-pass filter at a desired bandwidth, resulting in a "dirty derivative." A stable closed-loop system that relies on output derivatives remains stable when the derivatives are replaced with dirty derivatives of sufficiently high bandwidth. I prove and generalize this fact by a frequency-domain argument.
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