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Varying Lowpass Filter

Butterworth filter with varying coefficients

  • Varying Lowpass Filter block

Control System Toolbox / Linear Parameter Varying


The block implements an analog Nth-order Butterworth filter with unit DC gain and varying cutoff frequency.

Use this block and the other blocks in the Linear Parameter Varying library to implement common control elements with variable parameters or coefficients. For more information, see Model Gain-Scheduled Control Systems in Simulink.



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Lowpass filter input signal.

Filter cutoff frequency, specified in rad/s.


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Lowpass filter output signal.


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Lowpass filter order, specified as a positive integer.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2017b