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                        design within a phase margin of 45◦ to 50◦.
Thus the phase margin of this autopilot design is 40:3◦.
Phase margin ∆'
Assume a phase margin of more than 55◦ constraint and a gain margin of more than 8dB constraint are given for this design.
Fig. 4.57 shows the constraint boundaries of gain margin ∆L and phase margin ∆φ, and the
 
                        
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