The open-loop voltage gain of an amplifier is given by
![2006_Open loop voltage gain.jpg](https://secure.tutorsglobe.com/CMSImages/2006_Open%20loop%20voltage%20gain.jpg)
(a) Assuming the feedback transfer function is not a function of frequency, determine the frequency at which the phase of the loop gain is 180 degrees.
(b) At what value of β will the feedback amplifier become unstable?
(c) Using the value of β found in part (b), what is the low-frequency closed-loop gain?
(d) Is the closed-loop feedback system stable for smaller or larger values of β?