What is the 3dB bandwidth of the closed loop amplifier?
We define the bandwidth of a closed-loop control system in a manner similar to other electronic equipment such as amplifiers. 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.
How do you calculate bandwidth of non-inverting amplifier?
The bandwidth for the non-inverting amplifier, U1, is calculated by taking the gain bandwidth product and dividing by the non-inverting gain. So for this example, the bandwidth is 22 megahertz divided by 1, which is equal to 22 megahertz.
How to find the 3DB frequency of an op-amp?
The op-amp is described to have that transfer function and I am supposed to find the 3dB frequency of the entire amplifier. Here is what I did I used the fact that 3dB frequency occurs at a gain reduced by a factor of 1/sqrt (2).
Which is the correct result for 3DB frequency?
At least the beginning equation of your third image needs square root over the whole right half. There can be more errors. Here’s the correct result and how to use it: There is found that the closed loop DC voltage gain is 6. The denominator of the closed loop transfer function should have absolute value sqrt (2) at -3dB frequency.
How is the bandwidth of a closed loop amplifier determined?
There is a simple answer: The bandwidth for the closed-loop gain is determined by the frequency where the LOOP GAIN is 0 dB. In your example circuits the loop gain is not the same – hence, the bandwidth will not be the same.
What is the beta of an inverting AMP?
However, to get a gain of 2 for the inverting amp you need a beta of 1/3 as above, while for the non-inverting circuit (of gain 2) beta will be 1/2. Okay, so I am pretty late to the party, but I just thought I would provide future ponderers with a single equation to solve this for either inverting or non-inverting amplifiers of this nature: