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1999/03/29 (13:48) from 128.88.255.242' of 128.88.255.242' | Article Number : 331 |
¹°À½ÀÌ | Access : 3531 , Lines : 55 |
Re: Dynamic Range°¡ ¹«¾úÀΰ¡¿ä? |
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Á» ´õ ÀϹÝÀûÀÎ °ÍÀ» ³íÇϸé.. Dynamic Range¶õ ƯÈ÷ Active Device¿¡¼ InputÀ»º¯ÈÇÏ¸ç °¡ÇßÀ» ¶§ ±â´ëÇß´ø OutputÀÌ Á¦´ë·Î ³ª¿À´Â ¹üÀ§·Î À̼ÒÀÚ¸¦ »ç¿ëÇÒ ¼ö ÀÖ´Â µ¿ÀÛ¹üÀ§¸¦ ¸»ÇÏ°í¿ä. ¿©·¯°¡Áö ¿¹°¡ ÃæºÐÈ÷ ¾Õ¿¡ ºÐµéÀÌ ¼³¸íÇ߳׿ä. Image rejectionÀº Transistor°¡ Nonlinear DeviceÀ̹ǷΠÇ×»ó ±×¿¡ ÇØ´çÇÏ´Â Image Freqency°¡ Ãâ·Â´Ü¿¡ ¶ß°Ô µË´Ï´Ù. (Âü°í·Î °Å¿ï 󷳿ä) ±×·±µ¥ ÀÌ Frequecy¼ººÐÀ» ¸»ÇÒ¶§ µÎ°¡Áö·Î ³ªÅ¸³»Áö¿ä. Unknown Spurious: DesignÀÌ Àß ¸øµÇ¼ ³ª¿À°í¿ä Known Spurios (ÀÏÁ¾ÀÇ image frequency°í¿ä °è»ê¹ýÀº ¿Ã·Á³ù³×¿ä. ¹°·Ð Mixer¿Í AmpÀÇ ÁÖÆļö À§Ä¡´Â ´Ù¸£Áö¸¸ ¸ðµÎ´Ù Tr.·Î ÀÌ·ç¾îÁ³±â ¶§¹®¿¡ Ç×»ó image frequency°¡ »ý±â°Ô µË´Ï´Ù) Rejection À̶õ ¸» ±×´ë·Î FilteringÇÑ´Ù´Â ¿¹±â°í¿ä. ±×·¡¼ °á·ÐÀ¸·Î image rejectionÀ̶õ ¾Ë°í ÀÖ´Â Harmonic¼ººÐÀ» Á¦°ÅÇÑ´Ù°í ¸»ÇÒ¼öÀÖ½À´Ï´Ù. Spurious¶õ Á» ´õ ±¤¹üÀ§ÇÏ°Ô ¾²ÀÌ´Â ¸»ÀÌÁÒ. VSWRÀ̶õ ¾ÈÅ׳ªÀÇ ¼º´ÉÀ» º¼¶§³ª ¾î¶² ¼ÒÀÚÀÇ ÀÓÇÇ´ø½º ¸ÅĪÀÇ performance¸¦ º¼ ¶§ ¾²ÀÌÁÒ. VSWRÀÌ 1À϶§¸¦ Àü¼ÛµÈ power°¡ 100À¸·Î º»´Ù¸é, 2À϶§´Â 90%°¡ Àü¼ÛµÇ¾ú´Ù°í º¸°í ¹Ý»çÆÄ´Â 10%¸¦ °®°ÔµÇ´Â ¾à ¾ÈÁÁÀº µí ÇÑ Æ¯¼º °°³×¿ä. ±×·³ À̸¸... ±â wrote: >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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