A semiconductor device includes: an internal clock signal generation unit configured to receive an external clock signal and to generate an internal clock signal in response to a control signal; and a monitoring unit configured to monitor environmental elements reflected in a circuit response to the control signal. The method includes selectively providing pairs of first and second binary control signals corresponding to each of the CT signals in response to comparisons of RMS current changes of respective CT signals. Next an initial layout for the cell can be generated according to an initial set of values for the plurality of parameters. A set of blades is arranged around an outer part of the hollow hub, having an up ring and a down ring. A guide element is adapted to movably support the optical fiber in a position spaced away from the working region, and limit lateral movement of the tip without preventing longitudinal and rotational movement.