For example, say that a system requires an input voltage of 5V, however, you only have a source that can provide 1V. The use of a voltage amplifier is obviously the solution to the problem. However, since closed loop systems with negative feedback are ideal for stability etc. and hence are used instead of open loop configurations (except for oscillators), but doesn't a close loop change the dynamics of the entire system? Because the new gain is given as:
So obviously the gain in closed loop is less than the open loop (as expected), but now the device that requires a 5V input cannot run as the output voltage is considerably less (beta is 0.5). I have made a MicroCap-12 simulation to convey what I am trying to ask:
So my question is, how to make thse configurations equivalent such that the closed loop outputs a voltage of 5V? Is it just adding another amplifier to amplify the voltage 1.43V to get to 5V? If so then what is the point of making it closed loop (other than stability)?