A signal generator for generating a high frequency without using a VCO and a loop filter is disclosed. With the above structure, the total number of the spare elements of the defective memory cells of the DRAM can be reduced while the relieving ratio is being maintained. The method also includes producing a first signal multipath combined signal based upon the first signal match indication, and detecting a first peak in the first multipath combined signal. The resources are network addressable and register to a communications infrastructure for online availability. A third central ladder cutout 4 formed below the first central ladder with horizontal rib, merged with a rear channel, having a bigger length than that of the first central ladder. The bit-stream signal includes a plurality of scans.