Question

An all-pass network imparts only

(a) Negative phase to the input

(b) Positive phase to the input

(c) 90 degree phase shift to the input

(d) 180 degree phase shift to the input

The question was asked in unit test.

The above asked question is from Cascade Compensation in Time Domain topic in chapter Design of Control Systems

Answer 1

The correct choice is (d) 180 degree phase shift to the input

The explanation is: An all-pass network is the network that is the combination of the minimum and non-minimum phase systems and have the magnitude 1 for all frequencies and imparts only 180 degree phase shift.