1. Most of the specifications for the system of the unity feedback architecture shown on the right are boiled down to Bode/Nyquist/Nichols plots of the GK(s). a. But If there was a sensor block H(s) in the feedback R(S) E(s) K G(s) path, whose Bode/Nyquist/Nichols plots will you plot to check stability of the closed loop system? b. If there was a sensor block H(s) and also a prefilter block F(s) after the reference command, whose Bode/Nyquist/Nichols plots will you plot to check stability of the closed loop system? Y(s

Fig: 1