Control System Toolbox™

bandwidth - Frequency response bandwidth

Syntax

fb = bandwidth(sys)
fb = bandwidth(sys,dbdrop)

Description

fb = bandwidth(sys) computes the bandwidth fb of the SISO model sys, defined as the first frequency where the gain drops below 70.79 percent (-3 dB) of its DC value. The frequency fb is expressed in radians per second.

You can create sys using tf, ss, or zpk. See ltimodels for details. For FRD models, bandwidth uses the first frequency point to approximate the DC gain.

fb = bandwidth(sys,dbdrop) further specifies the critical gain drop in dB. The default value is -3 dB, or a 70.79 percent drop.

If sys is an S1-by...-by-Sp array of LTI models, bandwidth returns an array of the same size such that

fb(j1,...,jp) = bandwidth(sys(:,:,j1,...,jp))

See Also

dcgain, issiso, ltimodels

balred

bdschur