Comments on "Mixed L/sup /spl infin///H/sub /spl infin// suboptimal controllers for SISO continuous time systems"

The authors state that they have no serious criticism of the original paper but make certain remarks. An example in the original illustrates a method to do tradeoffs between two design goals: H/sub /spl infin// and L/sup /spl infin//. To make a fair comparison, they authors say that the optimal H/sub /spl infin// norm should have been presented. The also point out misprints, and make remarks on the cancellation of the integrator pole and the tending to /spl infin/ of the settling time.