Á¦¸ñ: Bluetooth Radio ÃøÁ¤ ±â¼ú : ¼Û½Å±â

  Ãâó:  ÀüÆÄÁøÈïÇùȸ

 
Bluetooth Radio ÃøÁ¤ ±â¼ú(1) : ¼Û½Å±â
<ÀüÆÄ¿¬±¸¼Ò RF±â¼úÆÀ ¿À¼ºÅà ¿¬±¸¿ø>,
<±¤¿î´ëÇб³ Á¤Åë½Å¿¬±¸¿ø À̱ÙÈ£ ±³¼ö/ RFIC¿¬±¸½Ç ¹Ú¿ìÁ¾ ¿¬±¸¿ø>

 

I. ¼­·Ð

ÃÖ±Ù ±Ù°Å¸® ¹«¼± ÀÎÅÍÆäÀ̽ºÀÇ »õ·Î¿î Ç¥ÁØÀ¸·Î Bluetooth°¡ °¢±¤¹Þ°í ÀÖ´Ù.
BluetoothÀÇ Æ¯Â¡Àº ISM(Industrial Scientific Medicine) BandÁß¿¡¼­ 2.4GHz ´ë¿ªÀ» »ç¿ëÇϹǷΠº°µµÀÇ License°¡ vlfdycl dksgdmau, 1MpsÀÇ Àü¼Û ¼Óµµ·Î ¹Ý°æ 10mÀ̳»¿¡¼­ ¹«¼± Á¢¼ÓÀ» Çϸç, ¼Û½Å±â Ãâ·Â¿¡ µû¶ó 100m À̻󿡼­µµ Åë½ÅÀÌ °¡´ÉÇÏ´Ù. ÃÊ´ç 1600ȸÀÇ FHSS(Frequency Hopping Spread Spectrum) ¹æ½ÄÀ¸·Î TDD±â¹ýÀ» »ç¿ëÇϸç ModulationÀº GFSK(Gaussian Frequency Shift Keying)¹æ½ÄÀ» »ç¿ëÇÑ´Ù.
Bluetooth Radio´Â RF ºÎºÐ°ú BasebandºÎºÐÀ¸·Î ÀÌ·ç¾îÁ® ÀÖ°í ¼Û½Å±â Ãâ·Â¿¡ µû¶ó Class 1,2, 3À¸·Î ºÐ·ùÇÏ¸ç °¢°¢ ÃÖ´ë Ãâ·Â 100mW(20dBm)À¸·Î ±¸ºÐµÈ´Ù.

 

[±×¸² 1] Class 1 Bluetooth RadioÀÇ ºí·Ïµµ

 

[±×¸² 1]Àº Class 1 Bluetooth RadioÀÇ ºí·Ïµµ¸¦ ³ªÅ¸³»¸ç, ¿ä±¸µÇ´Â ÃÖ´ë Ãâ·Â 20dBm°ú ÃÖ¼Ò Ãâ·Â 0dBm StepÀ¸·Î ³ª´· ¼ö ÀÖ¾î¾ß ÇϹǷÎ, º°µµÀÇ PA(Power Amplifier)¸¦ ´ÜÀÏĨ Radio ¸ðµâ¿¡ ¿ÜÀåÇÏ¿©¾ß ±¸ÇöÀÌ °¡´ÉÇÏ´Ù.

 

[±×¸² 2] Class 2 Bluetooth RadioÀÇ ºí·Ïµµ

 

±×¸² 2]´Â Class 2 Bluetooth RadioÀÇ ºí·Ïµµ¸¦ ³ªÅ¸³»¸ç, ¿ä±¸µÇ´Â ¼Û½Å±âÀÇ ÃÖ´ë Ãâ·ÂÀº 4dBmÀ̸ç ÃÖ¼Ò Ãâ·ÂÀº -6dBmÀ̹ǷΠ´ÜÀÏĨ Radio ¸ðµâ¸¸À» »ç¿ëÇÏ¿© ±¸ÇöÀÌ °¡´ÉÇÏÁö¸¸, ¸ðµâ Á¦ÀÛ¿¡ »ç¿ëÇÑ CSR(Cambridge Silicon Radio)»çÀÇ BC01 ChipÀº ÃÖ´ë Ãâ·ÂÀÌ 0dBmÀ̹ǷΠPA¸¦ ¿ÜÀåÇÏ¿©¾ß ÇÑ´Ù.

 

[±×¸² 3] Class 3 Bluetooth RadioÀÇ ºí·Ïµµ

 

[±×¸² 3]Àº Class 3 Bluetooth RadioÀÇ ºí·Ïµµ¸¦ ³ªÅ¸³»¸ç, ¿ä±¸µÇ´Â ¼Û½Å±âÀÇ ÃÖ´ë Ãâ·ÂÀº 0dBmÀ̸ç ÃÖ¼Ò Ãâ·ÂÀº ±ÔÁ¤Áö¾îÁöÁö ¾ÊÀ¸¹Ç·Î ´ÜÀÏĨ Radio ¸ðµâ¸¸À» »ç¿ëÇÏ¿© ±¸ÇöÀÌ °¡´ÉÇÏ´Ù.

º» °í¿¡¼­´Â Bluetooth Radio¸¦ CSR(Cambridge Silicon Radio)»çÀÇ BC01 ChipÀ» ÀÌ¿ëÇÏ¿© ÃÖ´ëÃâ·Â Power 20dBm ¹Ì¸¸ ±Ô°ÝÀÇ Class 1·Î Á¦ÀÛÇÏ¿© Bluetooth RF Test Specification¿¡ µû¸¥ ¼Û½Å´Ü ÃøÁ¤ ¹æ¹ýÀ» Á¦½ÃÇÏ¿´´Ù.

II. Bluetooth Radio ¼³°è ¹× Á¦ÀÛ

 

[±×¸² 4] Á¦ÀÛµÈ Bluetooth RadioÀÇ ºí·Ïµµ

 

[±×¸² 5] Á¦ÀÛµÈ TransceiverÀÇ ºí·Ïµµ30

 

¼Û½ÅºÎ´Â BC01 ĨÀÇ Ãâ·Â Tx_a¿Í Tx_b°¡ balunÀ» ÅëÇÏ¿© combineµÈ 0dBmÀÇ Ãâ·ÂÀÌ PAÀÇ ÀÔ·ÂÀ¸·Î Àΰ¡ÇÏ¿© 20dBm¸¦ Ãâ·ÂÇÑ´Ù. ½ºÀ§Ä¡´Â Tx Mode·Î ÀüȯµÇ¾î BPF(Band Pass Filter)¿¡¼­ Filtering µÇ¸ç ¾ÈÅ׳ª¸¦ ÅëÇØ Ãâ·ÂµÈ´Ù. PA´Â ¼±Çü¼º Á¶°ÇÀ» °í·Á IIP3·Ö P1dB°¡ Å« ¼ÒÀÚ¸¦ ¼±ÅÃÇÏ¿©¾ß ÇÑ´Ù. ½ºÀ§Ä¡¿Í ¾ÈÅ׳ª »çÀÌÀÇ BPF´Â Àü¼ÛµÇ´Â SignalÀÇ Spurious ¼ººÐ°ú Harmonic ¼ººÐÀ» Filtering ÇÑ´Ù.
CSR BC01 ĨÀÌ °¡Áö°í ÀÖ´Â ¼ö½Å´Ü ºÎºÐÀÇ Æ¯Â¡Àº Near Low-IFÀÇ ±¸Á¶·Î ¼ö½ÅµÇ´Â RF½ÅÈ£¸¦ ¼ö ¹é KHz - ¼ö MHz´ëÀÇ ³·Àº IF½ÅÈ£·Î º¯È¯½ÃÅ°°í, Å« ºÎÇǸ¦ Â÷ÁöÇÏ´Â IF-SAW(Surface Acoustic Wave) ÇÊÅÍ°¡ ÇÊ¿äÄ¡ ¾ÊÀ¸¸ç Heterodyne ±¸Á¶¿¡ ÀϾ´Â LO Leakage µîÀ» ÇÇÇÒ ¼ö ÀÖ´Ù. ¼ö½ÅµÇ´Â À̹ÌÁö ÁÖÆļö ¼ººÐÀº Image Rejection ¹Í¼­¿¡ ÀÇÇÏ¿© Â÷´ÜµÈ´Ù.
CSRÀÇ BC01 ĨÀº ÆÐŶ ŸÀÔÀÌ BGA·Î µÇ¾î ÀÖÀ¸¸ç, ÇÉÀÇ ¼ö°¡ 81 ÇÉÀ¸·Î ±¸¼ºµÇ¾î ÀÖÀ¸¹Ç·Î, ¼ÒÇü Bluetooth Radio¸¦ Á¦ÀÛÇϱâ À§Çؼ­´Â ÃÖ¼Ò 4 ÃþÀÌ»óÀ¸·Î PCB¸¦ ±¸ÇöÇÏ¿©¾ß ÇÑ´Ù. º» °í¿¡¼­´Â 6ÃþÀ¸·Î Á¦ÀÛÇÏ¿´À¸¸ç Build Up Board·Î ±¸ÇöÇÏ¿´´Ù. ƯÈ÷ RF¸¦ ÀÌ·ç°í ÀÖ´Â ÃþÀº 1Ãþ°ú 4ÃþÀÌ¸ç ³ª¸ÓÁöÀÇ ÃþÀº Power line°ú GroundÃþÀ» ÀÌ·çµµ·Ï ¼³°èÇÏ¿´´Ù.

 

[±×¸² 6] PCB °¢Ãþ¿¡ »ç¿ëÇÑ ±âÆÇ

[±×¸² 7] °¢ Ãþº° Board ÀçÁú

;

[±×¸² 6]Àº PCB °¢Ãþ¿¡ »ç¿ëÇÑ ±âÆÇÀ» ³ªÅ¸³½´Ù. [±×¸² 7]Àº °¢ Ãþº° Board ÀçÁúÀ» º¸¿©ÁÖ°í Àִµ¥, RF´ÜÀÎ 1ÃþÀº RCC¸¦ »ç¿ëÇÏ¿´À¸¸ç, 4Ãþ¿£ Strip combiner¸¦ ¼³°è Á¦ÀÛÇÏ¿´´Ù.

 

[±×¸² 8] PA Schematics

[±×¸² 9] PA ¼³°è °á°ú

[±×¸² 10] CombinerÀÇ ¼³°è °á°ú

 

PA´Â Filter¿Í SwitchÀÇ ¼Õ½ÇÀ» °í·ÁÇÏ¿© ¼³°è ¹× ¼±Á¤À» ÇÏ¿©¾ß ÇÑ´Ù. µû¶ó¼­ ÃÖ´ëÀÇ Ãâ·ÂÀ» ¾ò±â À§Çؼ­´Â ÃÖ´ë Ãâ·Â 23dBmÀÇ Æ¯¼ºÀ» ¾òÀ» ¼ö ÀÖ´Â ¼ÒÀÚ¸¦ ¼±Åà ¼³°èÇÏ´Â °ÍÀÌ ¹Ù¶øÁ÷ÇÏ´Ù. [±×¸² 8]°ú [±×¸² 9]´Â ADS ToolÀ» »ç¿ëÇÏ¿© PA¸¦ ¼³°èÇÑ °á°ú¸¦ ³ªÅ¸³½´Ù. ±×¸²¿¡¼­ 29.549dBÀÇ GainÀº ÀԷ¿¡ 10dB¸¦ Àΰ¡ÇÏ¿´±â ¶§¹®À̸ç, Simulation °á°ú 19dBÀÇ GainÀ» ¾òÀ» ¼ö ¾ú¾ú´Ù.
¶ÇÇÑ Retum Loss -12dBÀÇ °á°ú¸¦ ³ªÅ¸³»°í ÀÖ´Ù.
[±×¸² 10]Àº CombinerÀÇ ¼³°è °á°ú·Î 0dBÀÇ Ãâ·ÂÀ» ¾òµµ·Ï ¼³°èÇÏ¿´°í 2.4GHz ´ëÀÇ ¥ë /4¿Í Passive ¼ÒÀÚÀÎ Capacitor¸¦ »ç¿ëÇÏ¿© ¼³°èÇÏ¿´´Ù.

 

[±×¸² 11] ÇÊÅÍÀÇ ¼³°è °á°ú

[±×¸² 12] ÇÊÅÍÀÇ ÃøÁ¤ °á°ú

 

º» °í¿¡¼­´Â ¼ö½Å °¨µµ¸¦ Çâ»ó ½ÃÅ°±â À§Çá¿© º°µµÀÇ LNAÀ» ¿ÜÀåÇÏ¿´À¸¸ç, ¼³°è½Ã noise fiqure¸¦ ÃÖ´ë·Î ³·Ãß¾î ¼ö½Å °¨µµ¿¡ ¿µÇâÀ» ÃÖ´ëÇÑÀ¸·Î ÁÙÀÏ ¼ö ÀÖµµ·Ï ¼³°èÇÏ¿´´Ù.

 

[±×¸² 13] Layout °á°ú

[±×¸² 14] 40mm x 23mm x 0.8mmÀÇ Å©±â·Î Á¦ÀÛµÈ RadioÀÇ »çÁø

 

[±×¸² 13]Àº À§¿¡¼­ ¾ð±ÞÇÑ ¼³°è °á°ú¸¦ ¹ÙÅÁÀ¸·Î Cadstar¸¦ »ç¿ë LayoutÇÑ °á°ú¸¦ ³ªÅ¸³»¸ç [±×¸² 14]´Â 40mm x 23mm x 0.8mmÀÇ Å©±â·Î Á¦ÀÛµÈ RadioÀÇ »çÁøÀ» º¸¿©ÁØ´Ù.

¥². Bluetooth Radio ¼Û½Å´Ü ÃøÁ¤


Bluetooth Radio ¼Û½Å´Ù ½ÃÇèÀº Bluetooth Radio Test Specification¿¡ µû¶ó ÃøÁ¤ÇÏ¿´´Ù.
½ÃÇè¿¡ »ç¿ëµÈ Àåºñ´Â BLUETOOTH Communication Device CMU200 (ROHDE & SCHWAR Z»ç)°ú Spectrum Analyzer (ROHDE & SCHWA RX, HP), Signal Geverator¿Í Flash loading ¹× control ÇÁ·Î±×·¥ÀÌ´Ù.
Bluetooth Radio Test Specification¿¡ ±ÔÁ¤µÈ ¼Û½Å´Ü ÃøÁ¤ Ç׸ñÀº Output Power, Power Density, Power Control, Tx Output spectrum-Frequency Range, Tx Output Spectrum-20dB Bandwidth, Tx Output Spectrum-Adjacent Channel Power, Modulation Characteristics, Initial carrier Frequency Tolerance, Carrier Frequency Drift µîÀÌ´Ù.

1. Output power ÃøÁ¤

Output powerÀÇ ±ÔÁ¤Àº Class 1ÀÇ °æ¿ì 0dBm < power < 20dBm ÀÌ´Ù. ½ÃÇè½Ã EUT´Â 50ohm connector·Î ¿¬°áÇÏ°í, ¸¸¾à ¾ÈÅ׳ª connector°¡ ¾ø´Ù¸é Àû´çÇÑ coupling device¸¦ ÅëÇØ tester¿¡ ¿¬°áÇÑ´Ù. ¶ÇÇÑ EUT´Â loop back Å×½ºÆ® ¸ðµå »óÅ·ΠµÎ°í HoppingÀº onÀ» ÇÑ´Ù. EUT°¡ tester power controlÀ» Áö¿øÇÑ´Ù¸é LMP ¸í·ÉÀ» ÀÌ¿ë EUTÀÇ Ãâ·Â power¸¦ ÃÖ´ë·Î ¾òÀ» ¼ö ÀÖµµ·Ï ÇÑ´Ù. Tester´Â ÃÖÀå packetsÀÌ Áö¿øµÇ´Â ÃÖÀå payload(PRBS 9)¸¦ ÀÌ¿ë EUT¿¡ Àü¼ÛÇÑ´Ù.
ÃøÁ¤½Ã Spectrum analyzer´Â ´ÙÀ½°ú °°ÀÌ ¼³Á¤ÇÑ´Ù

-
Center frequency : °¡Àå ³·Àº µ¿ÀÛ ÁÖÆļö
-
Span : Zero Span
-
Resolution Bandwidth : 3MHz
-
Video Bandwidth : 3MHz
-
Dectector : Peak
-
Mode : Maxhold
-
Sweeptime : packet type (ÇϳªÀÇ ¿ÏÀüÇÑ packet) ¿¡ ÀÇÁ¸ÇÑ´Ù.
-
Trigger : extern (to signalling unit)

EUT°¡ spectrum analyzerÀÇ center frequency·Î burst¸¦ ÃÖÃÊ Àü¼Û½Ã¿¡´Â Àü¼Û burst Áö¼Ó ±â°£ÀÌ sweep over µÇµµ·Ï tiggering ÇÑ´Ù. tester´Â trace¿¡¼­ ÃÖ´ë power °ª Ppk¸¦ ±â·ÏÇϸç brust Áö¼Ó½Ã°£Áß Àû¾îµµ 20%¿¡¼­ 80% À̻󿡼­ average Power Pav¸¦ °è»êÇÑ´Ù.(burst Áö¼Ó ½Ã°£Àº average power¿Í ºñ±³ÇÏ¿© 3dB °¨¼ÒµÇ´Â leading°ú trailing »çÀÌÀÇ ½Ã°£ÀÌ´Ù.) Analyzer center frequency¸¦ mid operation grequency¿Í highest operation frequency·Î ¼³Á¤, extrem ½ÃÇè Á¶°Ç ÇÏ¿¡ ¸ðµç Áö¿ªº° hopping modeÀÇ spec¿¡ ´ëÇÏ¿© ¹Ýº¹ÇÑ´Ù.

 

[±×¸² 15] ÃøÁ¤µÈ Output Power

 

[±×¸² 15]´Â ÀÌ·¯ÇÑ ÃøÁ¤ ¹æ¹ýÀ» ¹ÙÅÁÀ¸·Î ÃøÁ¤µÈ °á°úÀ̸ç Output Power 17.31dBmÀ¸·Î ±ÔÁ¤¿¡ ÀûÇÕÇÔÀ» º¼ ¼ö ÀÖ¾ú´Ù.

2. Power Density ÃøÁ¤

Power Density ±ÔÁ¤Ä¡´Â 20dBm per 100KHz EIRP ¾ÆÇÏÀ̸ç, ÁÖÆļö ¹êµå À̳»¿¡ °¡Àå ³¹Àº 1 ä³Î ³»ÀÇ power Density ¸¦ ÃøÁ¤ÇÑ´Ù. ÃøÁ¤ ¼¼ÆÃÀº output power ÃøÁ¤½Ã¿Í °°À¸¸ç Spectrum analyzer´Â ´ÙÀ½°ú °°ÀÌ ¼³Á¤ÇÑ´Ù.

-
Center frequency : 2441Mhz
-
Span : 240MHz
-
Resolution Bandwidth : 100MHz
-
Video Bandwidth : 100MHz
-
Dectector : Peak
-
Mode : Maxhold
-
Sweeptime : 1 sec per 100MHz span
-
Trigger : freerum

Spetrum analyzer¸¦ ÃøÁ¤ traceÀÇ peak °ªÀ» ÁÖ´Â ÁÖÆļö·Î ¼³Á¤ÈÄ Zero span ¹× 1ºÐÀÇ sweep timeÀ¸·Î traceÀÇ peak °ªÀ¸·ÎºÎÅÍ power density¸¦ °è»êÇÑ´Ù.

 

[±×¸² 16] Power Density ÃøÁ¤ °á°ú

 

[±×¸² 16]Àº ÀÌ·¯ÇÑ ÃøÁ¤ ¹æ¹ýÀ» ¹ÙÅÁÀ¸·Î Power Density°¡ 16.98dBmÀ¸·Î ÃøÁ¤µÈ °á°úÀÌ´Ù.

3. Power Control ÃøÁ¤

Power Control ½ÃÇèÀº class 1¿¡ ±¹ÇÑµÈ Ç׸ñÀ¸·Î 2 - 8dBmÀÇ stepÀ¸·Î Á¶Àý °¡´ÉÇÏ¿©¾ß ÇÑ´Ù.
Áï stepÀ» 4 dBmÀ¸·Î ÇÒ °æ¿ì ÃøÁ¤µÈ ÃÖ´ë Ãâ·ÂÀÌ 17dBmÀÏ °æ¿ì 17, 13, 9, 5, 1dBm À¸·Î ControlµÇ¾î¾ß ÇÑ´Ù. EUT ¿¬°áÀº ¾ÕÀÇ power ÃøÁ¤½Ã¿Í °°°Ô Çϸç loopback test mode·Î HoppingÀº off ½ÃŲ´Ù. EUT´Â ÃÖ´ë output power¸¦ tester·Î Àü¼ÛÇÏ°í tester´Â LMP ¸í·ÉÀ» ÅëÇÏ¿© ÃÖ¼Ò ¼Û½ÅÁÖÆļö·Î ¼³Á¤ÇÏ°í pseudo random bitse quence¸¦ payload·Î ÇÏ´Â DH1 packetsÀ» EUT¿¡ Àü¼ÛÇÑ´Ù.
Spectrum analyzer´Â ´ÙÀ½°ú °°ÀÌ ¼³Á¤ÇÑ´Ù

-
Center frequency : ÃÖ¼Ò ¼Û½ÅÁÖÆļö
-
Span : Zero Span
-
Resolution Bandwidth : 3MHz
-
Video Bandwidth : 3MHz
-
Dectector : Peak
-
Mode : Maxhold
-
Sweeptime : ÇϳªÀÇ ¿ÏÀüÇÑ DH1 packet
-
Trigger : exter (to signalling unit)

½ÃÇè ¹æ¹ýÀº output powerÀÇ Æò±Õ ÃøÁ¤½Ã¿Í µ¿ÀÏÇϳª output powerÀÇ Æò±Õ ÃøÁ¤½Ã¿Í´Â ´Þ¸® EUT power´Â ´Ü°èÀûÀ¸·Î °¨¼ÒÇÏ°í ´Ù½Ã Áõ°¡ÇϹǷΠBurst È°¼º ¿µ¿ªÀÇ ÃÖ¼Ò 20%¿¡¼­ 80%ÀÇ time window¸¦ ÀÌ¿ë zero span mode·Î ÃøÁ¤ÇÑ´Ù.

 

[±×¸² 17] Power Control ÃøÁ¤ °á°ú

[±×¸² 17]Àº ÀÌ·¯ÇÑ ÃøÁ¤ ¹æ¹ýÀ» ¹ÙÅÁÀ¸·Î ÃøÁ¤µÈ °á°úÀÌ´Ù. ¿©±â¿¡¼­ ÁÖÀÇÇÒ »çÇ×Àº power control ÇÒ ¼ö ÀÖ´Â ÇÁ·Î±×·¥ÀÌ ÀÖ¾î¾ß¸¸ °¡´ÉÇÏ´Ù.

4. Tx Output Spectrum-Frequency Range ÃøÁ¤

Tx Output Spectrum-Frequency Range ÃøÁ¤±ÔÁ¤Àº 2.402 - 2.483GHz ¹üÀ§ ³»¿¡¼­ ÀÛµ¿µÇ´ÂÁöÀÇ ¿©ºÎ¸¦ ÃøÁ¤ÇÏ´Â Ç׸ñÀÌ´Ù. Lower Guard Band¹È 2MHzÀ̸ç Upper Guar Band´Â 3MHz·Î ±ÔÁ¤µÇ¾î ÀÖ´Ù. (ÀÌ Ç׸ñÀº ¾î´À ³ª¶óÀÇ ±ÔÁ¤À» µû¸¦ °ÍÀÎÁö¿¡ µû¶ó ´Ù¸£´Ù.)
ÃøÁ¤ ¼¼ÆÃÀº Output ÃøÁ¤½Ã°ú °°À¸¸ç EUT¸¦ °¡Àå ³·Àº TxÁÖÆļö·Î ¼³Á¤ÇÏ°í Tester´Â PRBS9¸¦ °®´Â DH1 packetÀ» payload·Î EUT¿¡ Àü¼ÛÇÑ´Ù.
Spectrum analyzer´Â ´ÙÀ½°ú °°ÀÌ ¼³Á¤ÇÑ´Ù

- Resolution Bandwidth(RBW) : 100MHz
- Video Bandwidth : 300MHz
-
Center frequency : TX frequency¸¦ Á¦°øÇÏ´Â °¡Àå ³·Àº °Í
-
Star frequency : 2399 & 2405MHz (¹Ì±¹/À¯·´)
-
Stop frequency : 2475 & 2485MHz (¹Ì±¹/À¯·´)
-
Dectector : Peak
-
Mode : averaging
-
Sweeptime : 2s (Àû¾îµµ sample´ç ÇϳªÀÇ burst)
-
Trigger : extern (to signalling unit)
-
Number of sweeps : 50

 

[±×¸² 18] Tx Output Spectrum-Frequency Range ÃøÁ¤ °á°ú

 

[±×¸² 18]Àº ÃøÁ¤ÇÑ °á°ú¸¦ ³ªÅ¸³»°í ÀÖÀ¸¸ç ±ÔÁ¤Ä¡¸¦ ¸¸Á·ÇÔÀ» ¾Ë ¼ö ÀÖ¾ú´Ù .

5. Tx Output Spectrum-20dB Bandwidth ÃøÁ¤

Tx Output Spectrum-20dB Bandwidth ÃøÁ¤ ±ÔÁ¤Àº ¡â f = I fH - fL i <= 1MHzÀÌ´Ù. ÀÌÇ׸ñÀÇ ½ÃÇèÀº EUT¸¦ °¡Àå ³·Àº µ¿ÀÛ ÁÖÆļö·Î Àü¼ÛÇϵµ·Ï ¼³Á¤ÇÑ´Ù. (°ü·ÃµÈ ¼ö½Å ÁÖÆļö´Â Bluetooth Test specification Annex 6.2.2¿¡ Á¤ÀǵǾî ÀÖ´Ù.)
ÃøÁ¤ ¼¼ÆÃÀº Tx Output Spectrum-Frequency Range ÃøÁ¤½Ã¿Í °°´Ù.
Spectrum analyzer´Â ´ÙÀ½°ú °°ÀÌ ¼³Á¤ÇÑ´Ù

-
Resolution Bandwidth(RBW) : 10MHz
-
Video Bandwidth : 30MHz
-
Center frequency : fTx center (°¡Àå³·Àº Tx µ¿ÀÛ ÁÖÆļö)
-
Span : 2.0MHz
-
Dectector : Peak
-
Mode : Maxhold
-
Sweeptime : auto
-
Trigger : freerum
-
Number of sweeps : 10

Àü¼Û ä³Î(emissionÀÇ peak)¿¡¼­ °¡Àå ³ôÀº poser °ªÀ» ãÀº ÈÄ 20dB °¨¼ÒÇÏ´Â ÃÖ¼Ò ¹× ÃÖ´ë ÁÖÆļö¸¦ ã¾Æ¼­ Frequency range¸¦ °è»êÇÑ´Ù.

 

[±×¸² 19] Tx Output Spectrum-20dB Bandwidth ÃøÁ¤ °á°ú

 

[±×¸² 19]¿¡¼­ 990KHz·Î ±ÔÁ¤ Ä¡¿¡ Æ÷ÇԵǴ °ÍÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.

6. Tx Output Spectrum-Adjacent Channel Power ÃøÁ¤

ACPR(Adjacent Channel Power Radio)Àº Spurious EmissionÀ» ¾çÀ¸·Î ³ªÅ¸³»±â À§ÇØ »ç¿ëÇϸç, ÀÌ Æ¯¼ºÀº PAÀÇ ¼º´É¿¡ Å©°Ô Á¿ìµÈ´Ù.
Blutooth Radio SpecificationÀÇ In-Band spurious Emission ±ÔÁ¤¿¡¼­ Frequency OffsetÀº ± 550KHz¿¡¼­ -20dBC·Î ±ÔÁ¤µÇ¾î ÀÖ´Ù.

 

[±×¸² 20] ACPR ÀÇ¹Ì ¼³¸í

 

[±×¸² 20]Àº ±× ÀÇ¹Ì ¸¦ ¼³¸íÇÏ°í ÀÖÀ¸¸ç, ¾Æ·¡ÀÇ ½ÄÀ¸·ÎºÎÅÍ, ä³ÎÀÇ ÃÖ´ë Power (a)¿Í OffsetµÇ´Â ÁöÁ¡ÀÇ ÃÖ¼ÒPower (b)Â÷ÀÌÀÇ 10dBc/Hz°¡ ¾ò¾îÁø´Ù.

     

[±×¸² 21] Tx Output Spectrum-Adjacent Channel Power ÃøÁ¤ °á°ú

 
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