Howtosignalprocessing
- Why do closed loops have higher bandwidth?
- What is bandwidth in closed-loop?
- What is the bandwidth of open-loop?
- What is the difference between open-loop and closed-loop?
Why do closed loops have higher bandwidth?
As the transient response of the system is improved by the use of feedback and it causes the settling time to reduce and the closed-loop system has higher bandwidth than open-loop systems and this implies an increase in the speed of response.
What is bandwidth in closed-loop?
The bandwidth of a closed-loop control system is defined as the frequency range where the magnitude of the closed loop gain does not drop below −3 dB as shown in Figure 6.54.
What is the bandwidth of open-loop?
Bandwidth is normally measured at the 3dB point of the frequency response and in the case of an op-amp (open-loop) this will be at 24Hz in the diagram. If closed loop components were present, the gain would be reduced to (say) 20dB (blue line) but the bandwidth would increase to 1MHz.
What is the difference between open-loop and closed-loop?
The main difference between an open-loop system and a closed-loop system is that the closed-loop system has the ability to self-correct while the open-loop system doesn't. Consequently, closed-loop systems are often called feedback control systems while open-loop systems are also known as non-feedback controls.
