# What is bandwidth? What is meant by 'not giving too much bandwidth if there is a RHP zero'?

From MurrayWiki

Bandwidth is the frequency range over which the gain has not decreased by more than 1/sqrt(2). For a lot of systems this is closely related to the gain crossover frequency (frequency at which the open loop gain is 1). Both those concepts can be found in AM08 (pg 322) or in the Monday lecture slides.

RHP zeros impose limitations on how big the bandwidth or the gain crossover frequency can be. This is what is meant by not giving too much bandwidth. See AM08 section 11.5 and especially Example 11.7.

'--Buzi 18:10, 19 November 2008 (PST)'