I have a doubt concerning the closed loop frequency responce of a control system.
Suppose I have the following situation:
in which is plotted the frequency response of a system with different badwidths. In this case I know that in generale the performances are good as the bandwidth of the closed loop increases and I know that the price to pay to increase the bandwidth is a high control effort, but is there some other drawbacks in increasing the bandwidth of a system?
I was thinking abouth the noises, which are at high frequencies, this if the bandwidth is at high frequencies, and the system does not roll off fast, the noises enter into the system.
But I am not sure about what I said.
I know that as the badwidth increases, also the reference tracking gets better, but I also see that the roll off is not smooth, I so I was interpreting also this as a fact that there are worse performances with respect to the noise rejection.
Also, I know that there are some limitation of increasing the bandwidth of a system. So, considering a stable and minimum phase system, I know that the limit in bandwidth ig given by the hardware.
But if I increase the bandwidth is there some other limitation? By doing some experimentaition I have see that the disturbance rejection gets worse after a certain frequency, is it due to noise?
Can somebody please help me?