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Step of 4 11.022E Consider the open loop transfer function of a feedback amplifier as, A(s): Substitute for S in the transfer function. The phase angle is given by, = tan Step of 4 Consider the phase shift, Equate the phase angle to 180° 180° = -3 tan tan = = tan Consider positive value of frequency. Hence, the frequency is, = rad Therefore, the frequency at which the phase shift is 180° is = rad S Step of 4 Determine the feedback factor. The feedback amplifier is stable if the loop gain, AB