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1999/03/26 (20:08) from 203.227.100.151' of 203.227.100.151' | Article Number : 325 |
±â | Access : 2957 , Lines : 36 |
Re: Dynamic Range°¡ ¹«¾úÀΰ¡¿ä? |
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Áø wrote: >Shin wrote: >>Àü ¼ö½Å±â¸¦ °øºÎÇÏ°í Àִµ¥ ¿ë¾î¸¦ Àß ¸ô¶ó¼¸®.... >>¹¯°í ½ÍÀº ¿ë¾î´Â ´ÙÀ̳ª¹Í Range ÀÔ´Ï´Ù. ±×¸®°í Image rejection°ú spurious response rejectionÀÇ Â÷ÀÌ´Â ¹«¾ùÀΰ¡¿ä? ±×¸®°í VSWR¿¡¼ 2:1À̶ó ÇÏ¸é ¹«¾úÀ» ¶æÇÏ´ÂÁö ¾Ë°í ½Í½À´Ï´Ù. ¾Æ½Ã´Â ºÐ¿¡ Á¶¾ðÀ» ¹Ù¶ø´Ï´Ù. Àоî Áּż °¨»ç, °¨»ç! ^.^ > >¾È³çÇϼ¼¿ä.. >Dynamic Range´Â amp¿¡¼ »ç¿ëÇÏ´Â ´Ü¾îÀÔ´Ï´Ù..Áï ÀúÁÖÆijª °íÁÖÆľÚÇÁ¿¡¼ >ÀԷ¿¡ µû¸¥ Ãâ·ÂÀÌ ¸®´Ï¾îÇÑ ¹üÀ§¸¦ ¸»ÇÕ´Ï´Ù.. > >ÀÔ·ÂÀÌ ¾î´À ÀÌÇÏ·Î ³»·Á°¡¸é ÀԷ½ÅÈ£¿¡ ´ëÇÑ ÁõÆøºñÀ²ÀÌÇÏ·Î ³ª¿À´ÂÁ¡°ú >¾î´ÀÀÌ»óÀ¸·Î µé¾î°¥¶§ Ãâ·ÂÀÌ ÁõÆøºñº¸´Ù ÀÛ°Ô ³ª¿Ã¶§ (ÀÌ´Â Âî±×·¯Áö´Â Á¡ÀÔ´Ï´Ù.. -1 dB point) ±îÁöÀÇ ÀÔ·Â ¹üÀ§¸¦ Dynamic Range¶ó°í ÇÕ´Ï´Ù.. > >mage rejectionÀº ¼ö½ÅÁÖÆļö ¿Ü¿¡ À̹ÌÁö ÁÖÆļö¶ó´Â°ÍÀÌ ÀÖ½À´Ï´Ù.. > >°¡·É ÀÔ·ÂÀÌ 100MHzÀÌ°í localÀÌ 89.3MHz,Áß°£ÁÖÆļö°¡10.7MHz¶ó°í >ÇÑ´Ù¸é 10.7MHzÃâ·ÂÀÌ ³ª¿Ã¼ö ÀÖ´Â ´Ù¸¥ ÁÖÆļö°¡ ÀÖ½À´Ï´Ù..78.6MHz°¡ > >Àִµ¥¿ä ÀÌÁÖÆļö°¡ À̹ÌÁö ÁÖÆļö¶ó°í ÇÕ´Ï´Ù.. > >100-89.3= 10.7(¿øÇϴ½ÅÈ£¿¡ ÀÇÇÑ IF) >78.6-89.3=10.7(À̹ÌÁö ½ÅÈ£¿¡ÀÇÇÑ IF) > >À̽ÅÈ£¸¦ ¾ó¸¶³ª ¾ï¾ÐÇϴ³İ¡ Image rejectionÀÔ´Ï´Ù.. > >±×·¯´Ï±î Image rejection°ú spurious response rejectionÀº ƯÁ¤½ÅÈ£Àΰ¡ > ¾Æ´Ñ°¡ÀÇ Â÷ÀÌ°¡ ÀÖ½À´Ï´Ù.. > >VSWRÀº °Ë»ö¶õ¿¡¼ VSWR·Î °Ë»öÇغ¸¼¼¿ä.. > >±×·³.. µ¡ ºÙÀÔ´Ï´Ù DYNAMIC RANGEÀÇ ¾Æ·¡ÂÊ ±âÁØÀº NOISE LEVELÀÔ´Ï´Ù Áï AMP ÀÚü¿¡¼ ¸¸µé¾îÁö´Â NOISE(ÁïAMPÀÇ NOISE FIGURE)¿Í ÀԷµǴ WHITE NOISE°¡ ÇÕÃÄÁ®¼ ³ª¿À´Â LEVELÀÔ´Ï´Ù. ImageÁÖÆļö´Â À§ÀÇ ¿¹¸¦ º¸¸é 189.3MHzÀÔ´Ï´Ù. Áï ¿ì¸®°¡ ¿øÇÏ´Â ½ÅÈ£´Â rf¿Í localÀÇ Â÷½ÅÈ£ÀÌÁö¸¸ ±× ÇÕ½ÅÈ£µµ ³ª¿É´Ï´Ù. ÀÌ¿Í°°ÀÌ ¿ì¸®°¡ ¿øÇÏÁö ¾Ê´Â ½ÅÈ£¸¦ imageÁÖÆļöÀÌÁö¿ä ÀÌ°ÍÀº ´Ï°Í»Ó¸¸¾Æ´Ï¶ó ´õ³Ð°Ô º¸¸é 2fo-rf, 2fo+rf ---µî ¸¹ÀÌ ÀÖ½À´Ï´Ù. |
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