Patent Number: 
Section: claims

1. A method of manufacturing a mask, the method comprising:designing a first mask data pattern;designing a second mask data pattern for forming the first mask data pattern;acquiring a first emulation pattern, which is predicted from the second mask data pattern, using layout-based Self-Aligning Double Patterning (SADP) emulation;comparing the first emulation pattern with the first mask data pattern, and modifying the second mask data pattern according to results of the comparison;performing Optical Proximity Correction (OPC) on the modified second mask data pattern;acquiring second emulation patterns, which are predicted from the second mask data pattern on which the OPC has been performed, using image-based SADP emulation; andcomparing the second emulation patterns and the first mask data pattern, andmanufacturing a first mask layer, which corresponds to the second mask data pattern on which the OPC has been performed, according to results of the comparison. 2. The method of claim 1, wherein the layout-based SADP emulation takes exposure conditions into account, and the image-based SADP emulation does not take the exposure conditions into account. 3. The method of claim 1, wherein:the modifying of the second mask data pattern comprises modifying the second mask data pattern, and designing third mask data patterns for forming some patterns that were not formed using the second mask data pattern;the performing of the OPC on the modified second mask data pattern comprises performing OPC on the modified second data pattern and the third mask data pattern;the acquiring of the second emulation pattern predicted from the corrected second mask data pattern comprises acquiring second emulation patterns predicted from the second and the third mask data patterns, on which the OPC has been performed; andthe manufacturing of the first mask layer comprises manufacturing first and second mask layers, which respectively correspond to the second and the third mask data patterns on which the OPC has been performed. 4. The method of claim 3, wherein the third mask data patterns comprise trimming patterns for trimming partial patterns of the first emulation pattern. 5. The method of claim 3, wherein the third mask data patterns comprise connection patterns for connecting partial patterns of the first emulation pattern with other partial patterns of the first emulation pattern. 6. The method of claim 3, wherein the third mask data patterns comprise dummy patterns, which are used to generate partial patterns in the first emulation pattern. 7. The method of claim 1, further comprising comparing the first emulation pattern with the first mask data pattern and redesigning the first or second mask data pattern according to results of the comparison. 8. The method of claim 1, further comprising comparing the second emulation patterns with the first mask data pattern and redesigning the first or second mask data pattern according to results of the comparison. 9. A method of manufacturing a mask, the method comprising:designing a first mask data pattern;designing a second mask data pattern for forming the first mask data pattern;acquiring a first emulation pattern, which is predicted from the second mask data pattern, using layout-based Self-Aligning Double Patterning (SADP) emulation;comparing the first emulation pattern with the first mask data pattern, and designing third mask data patterns for forming partial patterns, which were not formed using the second mask data pattern, according to results of the comparison;performing Optical Proximity Correction (OPC) on the second and the third mask data patterns;acquiring second emulation patterns, which are predicted from the second and the third mask data patterns on which the OPC has been performed, using image based SADP emulation; andcomparing the second emulation patterns with the first mask data pattern, and manufacturing first and second mask layers, which respectively correspond to the second and the third mask data patterns on which the OPC has been performed, according to results of the comparison. 10. The method of claim 9, wherein the layout-based SADP emulation takes exposure conditions into account, and the image-based SADP emulation does not take the exposure conditions into account. 11. The method of claim 9, wherein the third mask data patterns comprise trimming patterns for trimming partial patterns of the first emulation pattern. 12. The method of claim 9, wherein the third mask data patterns comprise connection patterns for connecting partial patterns of the first emulation pattern with other partial patterns of the first emulation pattern. 13. The method of claim 9, wherein the third mask data patterns comprise dummy patterns, which are used to generate partial patterns in the first emulation pattern. 14. The method of claim 9, wherein:the designing of the third mask data patterns comprises modifying the second mask data pattern, and designing the third mask data patterns; andthe performing of the OPC on the second and the third mask data patterns comprises performing OPC on the modified second mask data pattern and the third mask data pattern. 15. The method of claim 9, further comprising comparing the first emulation pattern with the first mask data pattern, and redesigning the first or the second mask data pattern according to results of the comparison. 16. The method of claim 9, further comprising comparing the second emulation patterns with the first mask data pattern and redesigning at least one of the first to third mask data patterns according to results of the comparison. 17. A method of manufacturing a mask, the method comprising:designing a first mask data pattern to be formed on a wafer;designing a second mask data pattern for forming the first mask data pattern using a Self-Aligning Double Patterning (SADP) process;examining whether the first mask data pattern is normally formed using the second mask data pattern, wherein the examination is performed using layout-based SADP emulation; andforming third mask data patterns for forming partial patterns, which were not formed using the second mask data pattern, according to results of the examination. 18. The method of claim 17, further comprising:performing Optical Proximity Correction (OPC) on the second and the third mask data patterns; andexamining whether the first mask data pattern is normally formed using the second and the third mask data patterns, on which the OPC has been performed. 19. The method of claim 18, wherein the examining whether the first mask data pattern is normally formed using the second and the third mask data patterns is performed using image-based SADP emulation. 20. The method of claim 18, further comprising manufacturing first and second mask layers, which respectively correspond to the second and the third mask data patterns, according to results of the examining whether the first mask data pattern is normally formed using the second and the third mask data patterns.