Case 3: GH(s)=K db (dB) 201g K Muh=201g K 100 o(g o) p=0° ● 100 o(g o) 90° 180 (lg)  (lg) Mdb (dB) 0.1 1 10 100 0.1 1 10 100 −90 −180 20lg K Case 3: GH(s) = K =  = 0 20lg  Mdb K