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How do you find the closed loop bandwidth of an op-amp?
For example, if an op amp has a GBW product of X MHz, then its closed-loop bandwidth at a noise gain of 1 will be X MHz, at a noise gain of 2 it will be X/2 MHz, and at a noise gain of Y it will be X/Y MHz (see Figure 2 below).
What does closed loop bandwidth mean?
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. At frequencies greater than ωB, the closed-loop frequency response is attenuated by more than −3 dB.
What is the meaning of Closed Loop?
Closed loop refers to the feedback interconnection between two or more systems, such that the information flows in a cycle. This is in contrast to “open loop”, in which this cycle of information is interrupted and there is no corrective action based on the measurement.
How is the bandwidth of an open loop AMP measured?
2 Answers. 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.
Why is the bandwidth of an amplifier constant?
In a first-order system, the product of the gain and bandwidth is constant. This is simply a consequence of the fact that the gain is proportional to R (typically it is some kind of gm time R) and the bandwidth is inversely proportional to R (the bandwidth is some variant of 1/RC).
Why does the bandwidth decrease as the gain increases?
3 Answers. For the gain is approximately and the bandwidth does not come into play. If the gain-bandwidth product can be approximated as which is a constant. Since it is a constant, increasing the gain requires a decrease in the bandwidth while decreasing the gain allows an increase in the bandwidth.