高速差分ADC驱动器使用规则

Analog Dialogue 43-05, 5ሆ(2009) 1 VA VA RF1 RF2 VIP VIN, dm VIN + – VOCM RG1 RG2 VOUT, dm VON VOP – + (1, 2) www.analog.com/analogdialogue (3, 4) (5, 6) (7) (8) (9) ߛ໏ֶݴADCൻۯഗ ยऺኸళ ፕኁǖJohn ArdizzoniࢅJonathan Pearson ᆅჾ ٷܠຕ၄پߛႠీADC๑ᆩֶݴ๼෇ᅞ዆ࠌఇሯำࢅ߅ඡăᆯᇀ ֑ᆩକೝ࢚ڦ႑ࡽت૙ݛ๕Ljኄዖݛ݆ీॽۯༀݔྷ༵ߛ2ԠLj ৊ܸ߀฀ဣཥጺ༹Ⴀీă໚඗ֶݴ๼෇႙ADCᄺీথ๴ڇ܋๼෇ ႑ࡽLjڍኻᆶሞ๼෇ֶݴ႑ࡽ้֍ీइڥፌॅADCႠీăADC ൻۯഗጆோยऺᆩᇀ༵ࠃኄዖֶݴ႑ࡽڦۉୟ——੗ᅜྜׯႹܠ ዘᄲڦࠀీLjԈઔޗ܈ۙኝĂڇ܋ڟֶݴገ࣑Ă࣐؋Ăࠌఇೋዃ ۙኝࢅ୳հڪăጲٗླྀ؜AD81381ᅜࢫLjֶݴADCൻۯഗᅙঢ়ׯ ྺຕ਍֑णဣཥዐփ੗ईඍڦ႑ࡽۙ૙ᇮॲă ཮1๟ᅃዖएԨڦྜඇֶݴۉუݒઍ႙ADCൻۯഗăኄ߲཮ᇑد ཥሏݣڦݒઍۉୟᆶଇۅ൶՚ǖֶݴADCൻۯഗᆶᅃ߲ܮྔڦ๼ ؜܋(VON)ࢅᅃ߲ܮྔڦ๼෇܋(VOCM)ăړൻۯഗᇑֶݴ๼෇႙ ADC૶থ้Ljኄၵ๼෇๼؜܋੗ᅜ༵ࠃ࢔ٷڦଳऄႠă ᇑڇ܋๼؜၎ݒLjֶݴADCൻۯഗׂิೝ࢚ڦֶݴ๼؜႑ࡽ—— ၎ܔᇀVOCM——ሞVOPᇑVONኮक़ăኄ૛ڦPኸڦ๟ኟLjNኸڦ๟ ޶ăVOCM๼෇႑ࡽ੦዆๼؜ࠌఇۉუăኻᄲ๼෇ᇑ๼؜႑ࡽتᇀ ࡀۨݔྷాLj๼؜ࠌఇۉუՂۨڪᇀVOCM๼෇܋ڦۉუă޶ݒઍ ࢅߛਸ࣍ሺᅮዂ๑ݣٷഗ๼෇܋ڦۉუVA+ࢅVA-ํዊฉ၎ڪă ྺକՍᇀࢫ௬ڦ༪ஃLjႴᄲ௽ඓᅃၵۨᅭăසࡕ๼෇႑ࡽ๟ೝ࢚ ႑ࡽLjఫ஺VIPࢅVIN၎ܔᇀగ߲ࠅࠌ֖੊ۉუڦޗ܈ᆌ޿๟၎ڪ ڦLj၎࿋ሶ၎ݒăړ๼෇႑ࡽ๟ڇ܋႑ࡽ้Ljᅃ߲๼෇܋๟ࠦۨ ۉუLjଷᅃ߲๼෇܋ڦۉუ၎ܔኄ߲๼෇܋Վࣅă࿮ஃ๟నዖ൧ ઄Lj๼෇႑ࡽۼԥۨᅭྺVIP–VINă ֶఇ๼෇ۉუVIN, dmࢅࠌఇ๼෇ۉუVIN, cmڦۨᅭ९ࠅ๕1ࢅࠅ ๕2ă ཮1. ֶݴݣٷഗă ໚඗ኄ߲ࠌఇۉუڦۨᅭᆌᆩᇀೝ࢚๼෇้࢔኱࠵Ljڍܔڇ܋ ๼෇ཞᄣᆶၳă๼؜ᄺᆶֶఇࢅࠌఇଇዖLjഄۨᅭ९ࠅ๕3ࢅࠅ ๕4ă Ⴔᄲጀᅪํाڦ๼؜ࠌఇۉუVOUT, cmࢅVOCM๼෇܋ኮक़ڦֶᅴLj ኄֶ߲ᅴਦۨକ๼؜ࠌఇۉೝă ܔֶݴADCൻۯഗڦݴဆԲܔدཥሏݣڦݴဆᄲްሗڥܠăྺ କ०ࣅپຕ՗ٳ๕Ljሡ൐ۨᅭଇ߲ݒઍဣຕĝ1ࢅĝ2Lj९ࠅ๕5ࢅ ࠅ๕6ă ሞٷܠຕADCൻۯᆌᆩዐĝ1=ĝ2LjڍࡤᆶVIPĂVINĂVOCMĂĝ1ࢅ ĝ2ၜڦVOUT, dmཚᆩԿ࣍ࠅ๕ܔᇀକ঴ĝ฿ದܔႠీڦᆖၚݥ׉ᆶ ᆩăVOUT, dmڦऺ໙९ࠅ๕7LjഄዐԈઔକᇑೕ୲၎࠲ڦݣٷഗᆶ ၌ਸ࣍ۉუሺᅮA(s)ă ړĝ1 ≠ ĝ2้Ljֶݴ๼؜ۉუൽਦᇀVOCM——ኄփ๟૙ၙڦ঳ࡕLj ᅺྺ໲ׂิକೋᅎLjժ൐ሞֶݴ๼؜ዐᆶࡗٷڦሯำăۉუݒઍ ॐࠓڦሺᅮټ੻ओ๟׉ຕăᆶ඀ڦ๟Ljሺᅮټ੻ओዐڦሺᅮ๟ଇ ߲ݒઍဣຕೝ਩ኵڦڛຕăړĝ1 = ĝ2 ǎ ĝ้Ljࠅ๕7੗ᅜԥ०ࣅྺ ࠅ๕8ă ኄ߲՗ٳ๕ٷॆ੗ీ߸ेຄဒăړA(s) Ś ∞้Lj૙ၙڦԿ࣍ሺᅮ ੗ᅜ०ࣅྺRF/RGăሺᅮټ੻ױओࠅ๕ੂഐઠᄺ࢔ຄဒLjഄዐڦ “ሯำሺᅮ”ᇑدཥሏݣᅃᄣLjڪᇀ1/ĝă ݒઍဣຕ೅ದڦֶݴADCൻۯഗڦ૙ၙԿ࣍ሺᅮ९ࠅ๕9ă ๼؜ೝ࢚๟ֶݴADCൻۯഗڦᅃ߲ዘᄲႠీኸՔLj໲ݴଇ߲ݛ ௬ǖޗ܈ೝ࢚ࢅ၎࿋ೝ࢚ăޗ܈ೝ࢚ᆩᇀ࢚ଉଇ߲๼؜ሞޗ܈ݛ ௬ڦথৎײ܈Ljܔᇀ૙ၙݣٷഗઠຫ໲்๟ྜඇᅃዂڦă๼؜၎ ࿋ೝ࢚ᆩᇀ࢚ଉଇ߲๼؜ڦ၎࿋ֶᇑ180°ڦথৎײ܈ă๼؜ޗ܈ ई၎࿋ڦඪࢆ฿࢚ۼࣷሞ๼؜႑ࡽዐׂิᆶ࡞ڦࠌఇݴଉă๼؜ ೝ࢚ဃֶ(ࠅ๕10)๟ֶݴ๼෇႑ࡽׂิڦ๼؜ࠌఇۉუᇑ၎ཞ๼ ෇႑ࡽׂิڦ๼؜ֶఇۉუڦܔຕԲኵLjڇ࿋๟dBă Analog Dialogue 43-05, 5ሆ(2009)2 (10) RF RF RIN, dm VOCM RG RG (11) 200 200 RL, dm = 100 VOCM 200 200 RT = 133 − = 400 1 100 1 1 RT ཮3ǖ೅ದ100Ωد๼၍ă 2V 0V –2V 3.5V 2.5V 1.5V 3.5V 2.5V 1.5V 1.75V 1.25V 0.75V RF 500 RF 500 VOCM VOUT, dm2.5V RG 500 RG 500 VIN VON VOP – + ཮4ǖ֑ᆩڇ܋๼෇ڦADCൻۯഗ૩ጱă (12) 200 200 VOCM VOUT, dm2.5V 200 200 267 VON VOP – + ཮5ǖڇ܋๼෇ፆੇă ాևࠌఇݒઍ࣍ୟ೨๑VOUT, cmڪᇀ๼෇܋VOCMڦۉუLjܸٗٳڟ ྜெڦ๼؜ೝ࢚ă ॽ๼෇܋থڟADCൻۯഗ ت૙ߛ໏႑ࡽڦဣཥঢ়׉ࣷᆩڟADCൻۯഗăݴ߰ਐ૗גࡗ႑ࡽ հ׊ᅃၭ܎ڦഗॲኮक़ՂႷᆩਏᆶ๴੦ፆੇڦۉഘد๼၍૶থLj ᅜՆ௨೦࣋႑ࡽྜኝႠăړد๼၍ڦଇ܋ᆩഄ༬ኙፆੇ܋থ้੗ ᅜൽڥፌॅႠీăൻۯഗᅃӯݣሞ੍ৎADCڦںݛLjᅺُሞ໲் ኮक़փᄲ൱๑ᆩ๴੦ፆੇ૶থăڍڟADCൻۯഗ๼෇܋ڦᆅ෇႑ ࡽ૶থཚ׉࢔׊LjՂႷ֑ᆩኟඓۉፆ܋থڦ๴੦ፆੇ૶থă փ࠶๟ֶݴ࣏๟ڇ܋LjADCൻۯഗڦ๼෇ፆੇՂႷٷᇀईڪᇀ૙ ၙڦዕ܋ۉፆኵLjᅜՍཁेڦዕ܋ۉፆRTీᇑݣٷഗ๼෇܋ժ૴ ٳڟᄲ൱ڦۉፆኵăԨ࿔༪ஃڦ૩ጱዐڦ໯ᆶADCൻۯഗۼยऺ ׯਏᆶೝ࢚ڦݒઍԲLjස཮2໯๖ă ᅺྺଇ߲ݣٷഗ๼෇܋ኮक़ڦۉუԥ޶ݒઍൻۯڟଭLjᅺُଇ߲ ๼෇܋تᇀ૶থጒༀLjֶݴ๼෇ፆੇRIN৽०ڇںڪᇀ2×RGăྺ କ೅ದد๼၍ፆੇRLLjႴᄲॽᆯࠅ๕11ऺ໙ڥڟڦۉፆRTੵথሞ ֶݴ๼෇܋ă཮3ߴ؜କۆ႙ڦۉፆኵLjഄዐRF =RG=200ΩLj૙ ၙڦRL, dm=100ΩLjRT=133Ωă ڇ܋๼෇ڦ܋থ߸े஑ݑă཮4௮ຎକ֑ᆩڇ܋๼෇ࢅֶݴ๼؜ ڦADCൻۯഗ߾ፕᇱ૙ă ໚඗๼෇๟ڇ܋ڦLjڍVIN, dmڪᇀVINăᅺྺۉፆRFࢅRG๟၎ڪࢅ ೝ࢚ڦLjᅺُሺᅮ๟1Ljܸ൐ֶݴ๼؜VOP–VONڪᇀ๼෇Ljन 4Vp-păVOUT, cm=VOCM=2.5VLjܸ൐ٗူݛڦݒઍۉୟ੗ᅜੂ؜Lj ๼෇ۉუVA+ࢅVA-ڪᇀVOP/2ă ߵ਍ࠅ๕3ࢅࠅ๕4LjVOP=VOCM+VIN/2Ljन2.5V±1Vڦཞ၎ӦޗǗ VON=VOCM–VIN/2Ljन2.5V±1Vڦݒ၎ӦޗăኄᄣLjVA+ࢅVA-ڦ Ӧޗڪᇀ1.25V±0.5VăՂႷᆯVIN༵ࠃڦۉୁ঍ୁݴଉڪᇀ (2V–0.5V)/500Ω=3mALjᅺُڟںڦۉፆՂႷ೅ದLjٗVINੂࡗ ඁྺ667Ωă ړ௅߲࣍ୟڦݒઍဣຕۼ೅ದ้Ljࠅ๕12৽๟ऺ໙ኄ߲ڇ܋๼෇ ۉፆڦཚ๕LjഄዐRIN, se๟ڇ܋๼෇ۉፆă ኄ๟ऺ໙ዕ঳ۉፆڦ؜݀ۅă඗ܸኵڥጀᅪڦ๟Ljݣٷഗሺᅮࠅ ๕एᇀଭፆੇ๼෇ᇸڦ्ยăᆯᇀ٪ሞڇ܋๼෇ሰׯڦփೝ࢚ܸ ՂႷेᅜ೅ದڦዘᄲᇸፆੇኻࣷሺेฉ௬RGڦፆኵăྺକԍ׼ೝ ࢚LjՂႷሺेူ௬RGڦፆኵઠํ၄೅ದLjڍኄࣷᆖၚሺᅮኵă໚ ඗੗ᅜྺ঴ਦ܋থڇ܋႑ࡽ࿚༶ܸ֑ᆩᅃ߲ހԿႚ๕ڦ঴ਦݛ ӄLjڍᅃӯ๑ᆩ۞پڦݛ݆ăሞူ௬ڦ૩ጱዐኄዖႴ൱ॽՎڥ࢔ ௽၂ă ሞ཮5ዐLjྺକԍ׼گڦሯำLjᄲ൱ڇ܋ڟֶݴሺᅮྺ1Lj๼෇ዕ ঳ۉፆྺ50ΩLjݒઍࢅሺᅮۉፆኵሞ200Ωፑᆸă ߵ਍ࠅ๕12੗ᅜ໙؜ڇ܋๼෇ۉፆྺ267Ωăࠅ๕13՗௽Ljժ૴ ۉፆRTᆌڪᇀ61.5ΩLj֍ీॽ267Ω๼෇ۉፆ३ၭ዁50Ωă ཮2. ֶݴݣٷഗڦ๼෇ፆੇă Analog Dialogue 43-05, 5ሆ(2009) 3 (13) 200 200 VOCM VOUT, dm2.5V 200 20050 2V p-p VON VOP – + RT 61.5 ཮6ǖټᇸۉፆࢅዕ܋ۉፆڦڇ܋ۉୟă RTH 27.6 VTH 1.1V p-p ཮7ǖ๼෇ᇸڦThéveninڪၳۉୟă RTS 27.6 RF 200 RF 200 VOCM VOUT, dm2.5V RG 200 RG 200 RTH 27.6 VTH 1.1V p-p VON VOP – + ཮8ǖೝ࢚ڦڇ܋܋থۉୟă (14) (15) ཮9๟ᆩՔጚ1%৛܈ۉፆํ၄ڦྜኝۉୟă ๼෇ۉፆRIN, seڦऺ໙९ࠅ๕18ă RF 205 RF 205 VOCM VOUT, dm2.5V RG 200 RG 200 RS 50 2V p-p VON VOP – + RT 61.9 RTS 28 RIN, se ཮9ǖྜኝڦڇ܋܋থۉୟă (16) (17) (18) ཮6๟ټᇸۉፆࢅዕ܋ۉፆڦۉୟăټ50Ωᇸۉፆڦᇸਸୟۉუྺ 2Vp-păړᇸᆩ50Ω܋থ้Lj๼෇ۉუ३ၭڟ1Vp-pLjኄ߲ۉუᄺ ๟ڇ࿋ሺᅮൻۯഗڦֶݴ๼؜ۉუă ኄ߲ۉୟ؛ੂഐઠݥ׉ྜኝLjڍփ೅ದڦ61.5Ωۉፆᇑ50Ωڦժ૴ ժሺेڟକฉ௬ڦRGۉፆLjኄ৽߀Վକሺᅮࢅڇ܋๼෇ۉፆLjժ ൐ሰׯݒઍဣຕ฿ದăሞگሺᅮ൧઄ူLj๼෇ۉፆڦՎࣅ࢔ၭLjሡ ้੗ᅜࢮ୼Ljڍݒઍဣຕධ඗ՂႷ೅ದă঴ਦኄ߲࿚༶ڦፌ०ڇ ݛ݆๟ሺेူ௬RGڦፆኵă཮7๟ᅃዖThéveninڪၳۉୟLjഄዐ ฉݛڦժ૴ፇࢇᆩፕᇸۉፆă ᆶକኄዖ༺پݛӄࢫLj৽੗ᅜॽ27.6ΩڦۉፆRTSሺेڟူ௬ڦ࣍ ୟዐํ၄࣍ୟݒઍဣຕڦ೅ದLjස཮8໯๖ă ࠵ִǖ֖੊཮9Ljൻۯഗڦڇ܋๼෇ۉፆRIN, seᆯᇀRFࢅRGڦ߀Վ ܸՎࣅăൻۯഗฉ܋࣍ୟڦሺᅮۉፆ๟200ΩLjူ܋࣍ୟڦۉፆ๟ 200Ω+28Ω=228Ωăሞփཞሺᅮۉፆኵڦ൧઄ူऺ໙RIN, se๯ံᄲ ൱ऺ໙ଇ߲ĝኵLj९ࠅ๕16ࢅࠅ๕17ă ኄ߲ኵᇑᇱઠऺ໙ڦ267ΩฎᆶփཞLjڍܔRTڦऺ໙ுᆶ၂ዸڦ ᆖၚLjᅺྺRIN, seᇑRT๟ժ૴ڦ࠲ဣă සࡕႴᄲ߸৛ඓڦጺ༹ሺᅮLj੗ᅜ๑ᆩ߸ߛ৛܈ईز૴ڦ੗ۙۉ ፆă ฉຎ௮ຎڦڇْ۞پݛ݆ݥ׉๢ࢇԿ࣍ሺᅮྺ1ई2ڦׇࢇăሺᅮ ሁߛLjRTSڦኵሁথৎRGኵLjᆩࠅ๕18ऺ໙ڦRIN, seኵᇑᆩࠅ๕ 12ऺ໙ڦRIN, seኵኮक़ڦֶᅴ৽ሁٷăሞኄၵ൧઄ူᄲ൱֑ᆩܠْ ۞پă ܠْ۞پժփవํ၄ǖፌৎADIࠅິ݀քڦ੗ူሜڦֶݴݣٷഗ ऺ໙߾ਏADIsimDiffAmp™ (֖੊࿔၅2)ࢅADI Diff Amp Calcu- lator™(֖੊࿔၅3)ፁᅜڅړُඪLj໲்ీሞब௱ాྜׯฉຎऺ໙ă ๼෇ࠌఇۉუݔྷ ๼෇ࠌఇۉუݔྷ(ICMVR)ࡀۨକኟ׉߾ፕጒༀူ੗ᅜแेᇀֶ ݴݣٷഗ๼෇܋ڦۉუݔྷăሞኄၵ๼෇܋ฉװ၄ڦۉუ੗ᅜԥ ׬ྺICMVĂVacmईVA±ăኄ߲ICMVRኸՔঢ়׉ԥဃ঴ăፌ׉ᇜ ڟڦవ༶๟ඓֶۨݴݣٷഗ๼෇܋ڦํाۉუLj༬՚๟၎ܔᇀ๼ ෇ۉუܸჾăኪڢՎଉVIN, cmĂĝࢅVOCMڦኵࢫLjړĝփ၎ڪ้๑ ጀᅪLj1.1Vp-pڦThéveninۉუᄲٷᇀ1Vp-pڦኟඓ܋থۉუLjܸ ௅߲ሺᅮۉፆሺेକ27.6ΩLjইگକԿ࣍ሺᅮăܔᇀٷۉፆ(>1k Ω)ࢅگሺᅮ(1ई2)ઠຫኄၵ၎ݒڦၳᆌएԨڸၩLjڍܔᇀၭۉፆ ईডߛሺᅮઠຫժփీྜඇڸၩă཮8໯๖ۉୟ၄ሞݴဆഐઠ৽ ࢔ඹᅟକLjഄዐڦֶݴ๼؜ۉუ੗ᅜᆩࠅ๕14ऺ໙ă ֶݴ๼؜ۉუժփྜඇڪᇀ૙ၙڦ1Vp-p Ljڍ੗ᅜཚࡗႪ߀ݒઍ ۉፆํ၄ፌዕ܀૬ڦሺᅮۙኝLjසࠅ๕15໯๖ă Analog Dialogue 43-05, 5ሆ(2009)4 (19) (20) A –IN +IN Q2 Q3 Q1 Q4 RF RF VOCM RG RG CIN CIN ཮11ǖ঍ୁ᳘ࢇ႙ADCൻۯഗă ADCൻۯഗ ICMVR VOCM ࠃۉۉუ ࠃۉۉუ ๼؜Ӧޗ (V) ISUPPLY (mA) ׂ೗႙ࡽ ټ੻ (MHz) უӦ୲ (V/ s) ሯำ (nV) Ƃ 5 V Ƃ 5 V Ƃ 3.3 V Ƃ 3 V Ƃ 5 V Ƃ 5 V Ƃ 3.3 V Ƃ 3 V AD8132 360 1000 8 –4.7 ዁ +3 0.3 ዁ 3 0.3 ዁ 1.3 0.3 ዁ 1 ï3.6 1 ዁ 3.7 — 0.3 ዁ 1 ï1 12 AD8137 76 450 8.25 –4 ዁+4 1 ዁ 4 1 ዁ 2.3 1 ዁ 2 ï4 1 ዁ 4 1 to 2.3 1 to 2 RR 3.2 AD8138 320 1150 5 –4.7 ዁+3.4 0.3 ዁ 3.2 — — ï3.8 1 ዁ 3.8 — — ï1.4 20 AD8139 410 800 2.25 –4 ዁+4 1 to 4 — — ï3.8 1 ዁ 3.8 — — RR 24.5 ADA4927-1/ ADA4927-2 2300 5000 1.4 –3.5 ዁ +3.5 1.3 to 3.7 — — ï3.5 1.5 ዁ 3.5 — — ï1.2 20 ADA49232-1/ ADA49232-2 1000 2800 3.6 –4.8 ዁ +3.2 0.2 to 3.2 — — ï3.8 1.2 ዁ 3.2 — — ï1 9 ADA4937-1/ ADA4937-2 1900 6000 2.2 — 0.3 to 3 0.3 ዁ 1.2 — — 1.2 ዁ 3.8 1.2 ዁ 2.1 — ï0.8 39.5 ADA4938-1/ ADA4938-2 1000 4700 2.6 –4.7 ዁ +3.4 0.3 ዁ 3.4 — — ï3.7 1.3 ዁ 3.7 — — ï1.2 37 ADA4939-1/ ADA4939-2 1400 6800 2.6 — 1.1 ዁ 3.9 0.9 ዁ 2.4 — — 1.3 ዁ 3.5 1.3 ዁ 1.9 — ï0.8 36.5 ᆩཚ๕19Ăړĝ၎ڪ้๑ᆩ०ࣅࠅ๕20৽੗ᅜऺ໙؜ݣٷഗڦ๼ ෇ۉუ(VA±)ă ऻዿVA๔ዕ๟ӀԲ૩໫ၭڦ๼෇႑ࡽLjኄᅃۅݥ׉ᆶᆩ(९཮4)ă փཞڦݣٷഗૌ႙ᆶփཞڦ๼෇ࠌఇۉუݔྷăADIࠅິڦߛ໏ ֶݴADCൻۯഗᆶଇዖ๼෇पದዃLjनዐ႐႙ࢅೋᅎ႙ăዐ႐႙ ADCൻۯഗڦ๼෇ۉუ૗௅߲ۉუࡆᆶሀ1Vڦਐ૗(ᅺُঢዐ႐ ႙)ăܸೋᅎ႙๼෇पሺेକଇ߲ৗ༹࠶LjሎႹ๼෇܋ۉუӦޗ߸ থৎ–VSࡆă཮10๟ᅃ߲ۆ႙ֶݴݣٷഗ(Q2ࢅQ3)ڦ०ࣅ๼෇ᇱ ૙཮ă ܔᇀ֑ᆩ঍ୁ᳘ࢇ๼෇ڦֶݴ዁ֶݴᆌᆩઠຫLjݣٷഗ๼෇܋װ ၄ڦ኱ୁࠌఇۉუڪᇀ኱ୁ๼؜ࠌఇۉუLjᅺྺ኱ୁݒઍۉୁԥ ๼෇ۉඹ߰૗କăଷྔLj኱ୁݒઍဣຕᄺ๟೅ದڦLjྜඇڪᇀڇ ࿋1ăVOCM——ࢅᆯُڥڟڦ኱ୁ๼෇ࠌఇۉუ——ঢ়׉ԥยዃ ሞۉᇸۉუڦᅃӷፑᆸăਏᆶዐ႐႙๼෇ࠌఇݔྷڦADCൻۯഗ ݥ׉๢ࢇኄૌᆌᆩLj໲்ڦ๼෇ࠌఇۉუথৎࡀۨݔྷڦዐ႐ă ঍ୁ᳘ࢇڇ܋዁ֶݴᆌᆩᇑܔᆌڦֶݴ๼෇ᆌᆩݥ׉၎ຼLjڍ ሞݣٷഗ๼෇܋ਏᆶࠌఇ࿖հ——ӀԲ૩໫ၭڦ๼෇႑ࡽ“ް዆ ೗”ăਏᆶዐ႐႙๼෇ࠌఇݔྷڦADCൻۯഗॽೝ਩๼෇ࠌఇۉ უยۨሞࡀۨݔྷڦዐक़Ljᅺܸీྺٷܠຕᆌᆩዐڦ࿖հ༵ࠃፁ ࠕڦ޷ᇆ܈ă ړ๼෇᳘ࢇݛ๕੗჋้Ljኵڥට்ጀᅪڦ๟Lj֑ᆩ঍ୁ᳘ࢇ๼෇ ڦADCൻۯഗԲ֑ᆩ኱ୁ᳘ࢇ๼෇ڦ၎ຼൻۯഗࡼො߸ณڦࠀ ୲Ljᅺྺଇ߲ݒઍ࣍ୟዐۼփ٪ሞ኱ୁࠌఇۉୁă ړADCᄲ൱๼෇ࠌఇۉუᇑൻۯഗ๼؜܋ۉუྜඇփཞ้Lj঍ୁ ᳘ࢇADCൻۯഗڦ๼؜৽ݥ׉ᆶᆩăړVOCMኵԥยሞۉᇸۉუ ᅃӷ޹ৎ้Ljൻۯഗॽᆶፌٷڦ๼؜ӦޗLjڍړൻۯᄲ൱ݥ׉گ ೋᅎ႙๼෇ॐࠓሎႹֶݴݣٷഗت૙ມटႠ๼෇႑ࡽLjन๑ݣٷ ഗ๟֑ᆩڇۉᇸࠃۉLjᅺُኄዖॐࠓݥ׉๢ࢇ๼෇๟ںईںۉೝ ᅜူڦڇۉᇸᆌᆩăሞ๼෇܋ሺेڦPNPৗ༹࠶(Q1ࢅQ4)੗ᅜ ॽֶݴܔڦ๼෇ۉუၠฉೋᅎᅃ߲ৗ༹࠶ڦVbeۉუă૩සLjړ -IN܋ۉუྺ-0.3V้LjAۅۉუॽྺ0.7VLjሎႹֶݴܔኟ׉߾ ፕăுᆶPNP(ዐ႐႙๼෇प)้LjAۅڦ-0.3Vۉუॽ๑NPNֶݴ ܔتᇀݒၠೋዃጒༀLjᅺܸ࿮݆ኟ׉߾ፕă ՗1༵ࠃକADIࠅິADCൻۯഗڦܠຕኸՔᅃબ՗ăܔኄቧ՗ٚ ୼ᅃੂ৽ీ݀၄నၵൻۯഗਏᆶೋᅎ႙ICMVRLjనၵுᆶă ཮10ǖਏᆶೋᅎ႙ICMVRڦ०ࣅֶݴݣٷഗă ՗1ǖߛ໏ADCൻۯഗڦኸՔă ๼෇ࢅ๼؜᳘ࢇǖ঍ୁई኱ୁ Ⴔᄲ঍ୁ᳘ࢇ࣏๟኱ୁ᳘ࢇܔֶݴADCൻۯഗڦ჋ስᆶ࢔ٷڦᆖ ၚă๼෇ࢅ๼؜᳘ࢇኮक़ڦ੊୯ᅺ໎ᄺփཞă ঍ୁ᳘ࢇ႙๼෇पۉୟ९཮11ă Analog Dialogue 43-05, 5ሆ(2009) 5 RF RF VOCM ADC CMV TO ADC ROUT ROUT RG RG COUT COUT ཮12ǖ֑ᆩ঍ୁ᳘ࢇ๼؜ڦ኱ୁ᳘ࢇ๼෇ۉୟă ՗2ǖ᳘ࢇࢅ๼෇पۉୟ჋ၜă ๼෇᳘ࢇ ݛ๕ ๼෇႑ࡽ ۉᇸ ๼෇ૌ႙ ඪᅪ ඪᅪ ມۉᇸ ඪᅪᅃዖ ঍ୁ᳘ࢇ ڇ܋ ڇۉᇸ ዐ႐႙ ኱ୁ᳘ࢇ ڇ܋ ڇۉᇸ ೋᅎ႙ ঍ୁ᳘ࢇ ֶݴ ڇۉᇸ ዐ႐႙ ኱ୁ᳘ࢇ ֶݴ ڇۉᇸ ዐ႐႙ –120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 1.4 1.6 2.01.8 2.2 2.4 2.6 2.8 3.0 3.2 3.4 H A R M O N IC D IS T O R T IO N ( d B c) VOCM (V) VOUT = 2V p-p HD2 @ 10MHz HD3 @ 10MHz HD2 @ 30MHz HD3 @ 30MHz ཮13ǖ֑ᆩ5VۉᇸڦADA4932ሞ߳ዖೕ୲ူڦ ၿհ฿ኈᇑVOCMڦ࠲ဣă (21) ๼෇ࠌఇۉუڦگۉუADC้ࣷ؜၄࿚༶ăጽ؜ኄ߲ઓৣڦ०ڇ ݛ݆(཮12)๟ൻۯഗ๼؜ࢅADC๼෇ኮक़֑ᆩ঍ୁ᳘ࢇ૶থLjٗ ൻۯഗ๼؜ዐඁأADCڦ኱ୁࠌఇۉუLjժሎႹ๢ࢇADCڦࠌ ఇۉೝᆌᆩᇀ঍ୁ᳘ࢇ֨ă૩සLjൻۯഗ੗ᅜ߾ፕሞڇ5Vۉᇸࢅ VOCM=2.5VཉॲူLjܸADC੗ᅜ߾ፕሞڇ1.8VۉᇸLjُ้ሞՔ ऻྺADC CMVڦۅՂႴแे0.9Vڦ๼෇ࠌఇۉუă ਏᆶೋᅎ႙๼෇ࠌఇݔྷڦൻۯഗᅃӯፌ๢ࢇ߾ፕሞڇۉᇸ኱ୁ ᳘ࢇဣཥዐLjኄ๟ᅺྺ๼؜ࠌఇۉუཚࡗݒઍ࣍ୟํ၄କݴუLj ܸ൐໲ڦ੗Վݴଉ੗ᅜݥ׉থৎںLjन޶ۉუࡆăړ֑ᆩڇ܋๼ ෇้Lj๼෇ࠌఇۉუᆯᇀ๼෇၎࠲ڦ࿖հܸ߸থৎ޶ۉუࡆă ֑ᆩມۉᇸĂڇ܋ईֶݴ๼෇ᅜत঍ୁई኱ୁ᳘ࢇڦဣཥཚ׉੗ ᅜ֑ᆩඪᅃዖ๼෇पۉୟLjᅺྺ޷ᇆ܈ሺेକă ՗2ጺ঳କሞ๼෇᳘ࢇࢅۉᇸڦ߳ዖፇࢇݛ๕ူፌ׉ᆩڦADCൻ ۯഗ๼෇पۉୟૌ႙ă඗ܸLjኄၵ჋ስ࿄Ղጺ๟ፌࡻڦLjᆌ޿ܔ ௅߲ဣཥ৊ႜਏ༹ݴဆă ཮13๟ADA4932ሞ߳ዖೕ୲ူڦၿհ฿ኈᇑVOCMڦ࠲ဣ཮Lj๟ ۆ႙๼؜Ӧޗሞ௅߲ࡆ1.2Vా(޷ᇆଉ)ඓۨڦă๼؜Ӧޗ๟႑ࡽ ڦVOCMᇑVPEAKኮࢅ(1V)ăኵڥጀᅪڦ๟Lj฿ኈሞ2.8Vᅜฉ(3.8 VPEAKई5Vྫူ1.2V)ਸ๔ტ໏ሺेăሞگ܋Lj฿ኈሞ2.2V(-1 VPEAK)้ධ࢔گăཞᄣڦ၄ၡ࣏ॽ؜၄ሞټ੻ࢅუӦ୲ڦ༪ஃ ዐă ሯำ ADCڦݥ૙ၙ༬ႠԈઔଉࣅሯำĂۉጱईໜऐሯำࢅၿհ฿ኈă ሞٷܠຕᆌᆩዐዘᄲڦᅃۅ๟Ljሯำཚ׉๟੻ټဣཥዐፌዘᄲڦ ႠీኸՔă ໯ᆶADCాևۼ٪ሞଉࣅሯำLjժ൐ൽਦᇀ࿋ຕnLjnሁٷଉࣅሯ ำ৽ሁၭăᅺྺन๑“૙ၙ”ገ࣑ഗᄺᆶଉࣅሯำLjᅺُଉࣅሯำ ੗ᅜᆩፕԲডໜऐሯำࢅၿհ฿ኈڦएጚăADCൻۯഗڦ๼؜ሯ ำᆌ޿থৎईگᇀADCڦໜऐሯำࢅ฿ኈăူ௬ံ༪ஃADCሯ ำࢅ฿ኈڦ༬ኙLj඗ࢫ঻ถසࢆ࢚ଉADCൻۯഗሯำᇑADCႠ ీኮक़ڦ࠲ဣă ଉࣅሯำׂิڦᇱᅺ๟ADCॽਏᆶ࿮၌ݴՐ୲ڦఇె႑ࡽଉࣅׯ ᆶ၌ຕଉڦ૗ොኵăn࿋ADCᆶ2n߲ܾ৊዆ኵăଇ߲၎ତኵኮक़ ڦֶپ՗କ੗ᅜݴՐڦፌၭֶኵLjኄֶ߲ኵԥ׬ྺଉࣅڪपڦፌ گᆶၳ࿋(LSB)Ljईqăᅺُᅃ߲ଉࣅڪपڪᇀገ࣑ഗଉײڦ1/2nă සࡕᅃ߲փ܏Վࣅڦۉუঢ়ࡗᅃ߲ྜெڦn࿋ADCገ࣑Lj඗ࢫገ ࣑࣮ఇె႑ࡽLjምٗADC๼෇ዐ३ඁኄ߲႑ࡽLjఫ஺ֶኵੂഐઠ ৽ၟሯำă໲ᆶᅃ߲ࠅ๕21ऺ໙໯ڥᆶၳኵ(rms)ǖ ๼؜Ӧޗ ྺକፌٷࣅADCڦۯༀݔྷLjᆌ޿ॽ໲ൻۯڟ஢๼෇ݔྷăڍႴ ᄲጀᅪǖॽADCൻۯڥ໿ૣ࡞੗ీᆶ໦๼෇ۉୟLjܸൻۯփࠕڦ ࣆᆼࣷইگݴՐ୲ăॽADCൻۯڟ஢๼෇ݔྷժփᅪ࿆ጣݣٷഗ ๼؜ޗ܈ՂႷٳڟፌٷăֶݴ๼؜ڦᅃ߲ዷᄲࡻت๟௅߲๼؜ޗ ܈ኻႴٳڟدཥڇ܋๼؜ڦᅃӷăൻۯഗ๼؜੗ᅜᇺ૗ۉᇸࡆLj ܸٗ३ณ฿ኈăփࡗܔڇ܋ൻۯഗઠຫுᆶኄ߲ࡻتăړൻۯഗ ๼؜ۉუথৎۉუࡆ้Ljݣٷഗॽ໦฿၍Ⴀ܈Ljժᆅ෇฿ኈă ܔᇀܔ௅ᅃࡹޚڦ๼؜ۉუۼᆶᄲ൱ڦᆌᆩઠຫLj՗1၂๖၎ړܠ ڦADCൻۯഗీࠕ༵ࠃࡆڟࡆ๼؜Ljഄۆ႙޷ᇆଉٗबࡹޚڟब ӥࡹޚփڪLjਏ༹ൽਦᇀ޶ሜă Analog Dialogue 43-05, 5ሆ(2009)6 (24) (25) ENOBᄺీᆩSINADၜ՗ٳLj९ࠅ๕26ă (26) (27) (22) (23) ٗኄ૛੗ᅜڥ؜n࿋ADCሞഄలઊຯځټ੻ฉڦ႑ࡽᇑଉࣅሯำ Բڦܔຕ(dB)ࠅ๕22Ljኄᄺ๟n࿋ገ࣑ഗ໯ీൽڥڦፌॅ႑ሯԲ (SNR)ă ADCዐڦໜऐሯำԈࡤକඤሯำĂො૭ሯำࢅ෻ຮሯำLjᅃӯᄲ ٷᇀଉࣅሯำăᆯᇀADCڦݥ၍Ⴀׂิڦၿհ฿ኈࣷሞ๼؜႑ࡽ ዐׂิᇑ๼෇႑ࡽၿհᆶ࠲ڦᆶ࡞႑ࡽăጺڦၿհ฿ኈࢅሯำ (THD+N)๟ᅃ߲ዘᄲڦADCႠీ֖ຕLj໲࢚ଉକۉጱሯำࢅၿ հ฿ኈᇑথৎADC஢ଉײ๼෇ݔྷڦఇె๼෇႑ࡽኮक़ڦ࠲ဣă ۉጱሯำओݴڦټ੻Ԉઔକ໯ᄲ੊୯ڦፌࢫᅃ߲ၿհೕ୲ăTHD ዐڦ“T”(ttotalLjጺࢅ)Ԉઔକമ࿵߲ၿհ฿ኈݴଉLj๟૶ཞሯำ ᅃഐڦࢅڦೝݛߵLj९ࠅ๕23ă ࠅ๕23ዐڦv1๟๼෇႑ࡽLjv2ڟv6๟മ࿵߲ၿհ฿ኈݴଉLjvn๟ ADCڦۉጱሯำă(THD+ሯำ)ڦڛຕԥ׬ྺ႑ࡽᇑሯำ฿ኈ ԲLj०׬SINADLjཚ׉ᆩdB՗๖Lj९ࠅ๕24ă සࡕSINADԥ႑ࡽᇑଉࣅሯำԲپ༺(ࠅ๕22)Lj࿢்৽ీۨᅭገ ࣑ഗਏᆶڦᆶၳ࿋ຕ(ENOB)Ljമ༵๟ኄ߲ገ࣑ഗڦ႑ࡽᇑଉࣅ ሯำԲᇑSINAD၎ཞ(ࠅ๕25)ă ENOB੗ᆩઠԲডADCൻۯഗڦሯำႠీࢅADCڦሯำႠీLj৊ ܸಒ܏๟ޏ๢ࢇൻۯኄ߲ADCă཮14๟ᅃֶ߲ݴADCሯำఇ႙ă ࠅ๕27՗௽କཚ׉൧઄ူړĝ1=ĝ2ǎĝ้Ljӗ߲ሯำᇸዐ௅߲ᇸ ܔጺ๼؜ሯำ௢܈ڦࠋ၅ă Analog Dialogue 43-05, 5ሆ(2009) 7 + RF2 Vno, dm VnCM VOCM VnIN RF1 RG2 RG1 VnRF1 VnRF2 VnRG1 VnRG2 inIN+ inIN– ཮14ǖֶݴADCൻۯഗڦሯำఇ႙ă (28) (29) (30) (31) VOCM 8 2 1 5 4 OUT– OUT+ 3 6 U1 AD8138AR C1 10nF C1 10nF L1 L2 +VS –VS ཮15ǖۉᇸಖୟۉୟă (32) ጺ๼؜ሯำۉუ௢܈vno,dm๟ཚࡗऺ໙ኄၵݴଉڦࢅೝݛߵڥڟ ڦăॽኄၵࠅ๕๼෇ۉጱ՗߭๟ऺ໙ጺ๼؜ሯำۉუ௢܈ڦፌࡻ ݛ๕ăADIࠅິྪበฉ࣏ႎླྀ؜କADIֶݴݣٷഗऺ໙ഗ(֖੊࿔ ၅3)Ljᆩ໲ీ੺໏ऺ໙ሯำĂሺᅮࢅֶݴADCൻۯഗڦഄ໲֖ຕ ኵă ၄ሞ੗ᅜॽADCൻۯഗڦሯำႠీᇑADCڦENOBፕᅃԲডă ௮ຎኄᅃࡗײڦ૩ጱ๟ྺ֑ᆩ5Vۉᇸ߾ፕڦAD9445 ADC჋ስࢅ ೠࠚᅃ੼ሺᅮྺ2Ă2V஢ଉײ๼෇ڦֶݴൻۯഗă໲ీت૙ᆩᅃ ߲ڇटۅ୳հഗ၌዆Ă቞ᆩ50MHz(-3dB)ټ੻ڦ኱থ᳘ࢇ੻ټ႑ ࡽăٗຕ਍๮֩ዐऻሜڦ߳ዖཉॲူڦENOB֖ຕଚ՗ዐ੗ᅜ݀ ၄ǖܔᆌ50MHzڦలઊຯ༬ټ੻LjENOB=12࿋ă ADA4939๟ᅃ੼ీࠕԥ኱থ᳘ࢇڦߛႠీ੻ټֶݴADCൻۯ ഗăሞሯำႠీݛ௬໲๟ൻۯAD9445ڦࢇ๢ׂ೗஘ǛADA4939 ຕ਍๮֩ኍܔৎຼྺ2ڦֶݴሺᅮླྀ४ڦRF=402ΩĂRG=200ΩLj ຕ਍๮֩ߴ؜ڦኄዖ൧઄ူڦጺ๼؜ۉუሯำ௢܈ྺ9.7nV/Hză ๯ံऺ໙ߴ࢛ۨۨ๼෇ሯำࠀ୲೷௢܈ူڦဣཥሯำټ੻BNLj໲ ๟๼؜ᇑਦۨဣཥټ੻ڦํा୳հഗ၎ཞሯำࠀ୲ڦڪၳਈႚگ ཚ୳հഗڦټ੻ăܔᇀᅃ߲ڇट୳հഗLjBNڪᇀπ/2ױᅜ3dBټ ੻Ljසࠅ๕28໯๖ă ၎ܔᇀ12࿋ENOBLjൻۯഗڦރރ๼؜ሯำᇑADCڦLSBਏᆶ੗ ԲႠăᅺُٗሯำঙ܈ੂLjADA4939ൻۯഗݥ׉๢ࢇኄዖᆌᆩă ፌዕ࣏ՂႷཚࡗٲॺࢅ֪๬ൻۯഗ/ADCፇࢇፕ؜ਦۨă ۉᇸۉუ ੊୯ۉᇸۉუࢅۉୁ๟໫ၭADCൻۯഗ჋ስݔྷڦ੺໏཰০ă՗ 1༵ࠃକփཞۉᇸۉუူADCൻۯഗႠీڦ੺໏ֱቴ՗ăۉᇸۉ უࣷᆖၚټ੻Ă႑ࡽӦޗࢅICMVRă࢚ଉኄၵኸՔժ৊ႜݒް ඄࢚ܔֶݴݣٷഗڦ჋ስܸჾ዁࠲ዘᄲă ۉᇸᅞ዆(PSR)๟ଷྔᅃ߲ዘᄲڦ֖ຕăፕྺݣٷഗ๼෇ڦۉᇸ ᆅগڦፕᆩঢ়׉ԥටࢮ๫ăۉᇸ၍ฉई᳘ࢇ৊ۉᇸ၍ڦඪࢆሯำ ܔ๼؜႑ࡽۼᆶയሞڦ೦࣋ፕᆩă ੊୯ADA4937-1ڦۉᇸ၍ฉ٪ሞ60MHzĂ50mVp-pڦሯำኄᄣ ᅃ߲૩ጱă໲ڦPSRሞ50MHz้๟-70dBLjኄᅪ࿆ጣۉᇸ၍ฉڦ ሯำሞݣٷഗ๼؜܋ॽԥ३ณڟሀ16μVăሞ1V஢ଉײ๼෇ڦ16 ࿋ဣཥዐLj1 LSB๟15.3μVLjᅺُۉᇸ၍ฉڦኄ߲ሯำॽ“ჷு” LSBă ኄዖ൧઄੗ᅜཚࡗሺेز૴՗ཌྷཎᄟ༹ىዩL1/L2ࢅժ૴ಖୟۉ ඹC1/C2(཮15)ेᅜ߀৊ă ඗ࢫሞဣཥټ੻ڦೝݛߵాܔሯำ௢܈৊ႜओݴLjڥڟ๼؜ሯำ ᆶၳኵ(ࠅ๕29)ă ሞ50MHz้Ljىዩڦፆੇ๟60ΩLj10nF(0.01μF)ۉඹڦፆੇ๟ 0.32ΩLjᆯኄଇዖᇮॲፇׯڦປ३ഗ੗ᅜ༵ࠃ45.5dBڦປ३(ࠅ ๕32)ă ฉຎݴუ๕ປ३ेฉ-70dBڦPSRጺࠌ੗༵ࠃ115dBڦᅞ዆ၳ ࡕLjᅺܸ੗ॽሯำ३ၭڟᇺگᇀ1 LSBڦ90nVp-pፑᆸă ၿհ฿ኈ ೕᇘዐڦگၿհ฿ኈሞ቏ټࢅ੻ټဣཥዐۼ࢔ዘᄲăൻۯഗዐڦ ݥ၍Ⴀࣷሞݣٷഗ๼؜܋ׂิڇೕၿհ฿ኈࢅܠೕࢻۙ฿ኈă ሞሯำݴဆ૩ጱዐ๑ᆩڦݛ݆੗ᅜཞᄣᆌᆩᇀ฿ኈݴဆLjनܔ ADA4939ڦၿհ฿ኈᇑ2V஢ଉײ๼؜้AD9445 12࿋ENOBڦ1 LSB৊ႜԲডăᅃ߲ENOB LSBሞሯำݴဆዐپ՗488μVă ्ۨሯำޗ܈װߛຯݴքLjఫ஺ރރኵሯำڦऺ໙੗ᅜ๑ᆩ׉९ ڦ±3įோ၌(ሞ99.7%ڦ้क़ాሯำۉუӦޗ࿋ᇀኄၵோ၌ኮक़)Lj ९ࠅ๕30ǖ ၄ሞ੗ᅜሞ12࿋ENOBĂ2V஢ଉײ๼෇ݔྷएإฉܔൻۯഗڦރ ރ๼؜ሯำࢅAD9445 LSBڦ1 LSBۉუ৊ႜԲডLjഄዐLSBڦ ऺ໙९ࠅ๕31ă Analog Dialogue 43-05, 5ሆ(2009)8 ՗3ǖADA4939ڦْܾࢅෙْၿհ฿ኈă ֖ຕ ၿհ฿ኈ HD2 @ 10 MHz –102 dBc HD2 @ 70 MHz –83 dBc HD2 @ 70 MHz –83 dBc HD2 @ 100 MHz –77 dBc HD3 @ 10 MHz –101 dBc HD3 @ 70 MHz –97 dBc HD3 @ 100 MHz –91 dBc –60 –110 –105 –100 –95 –90 –85 –80 –75 –70 –65 1 10 100 H A R M O N IC D IS T O R T IO N ( d B c) FREQUENCY (MHz) HD2, VS (SPLIT SUPPLY) = ±2.5V HD3, VS (SPLIT SUPPLY) = ±2.5V HD2, VS (SPLIT SUPPLY) = ±1.65V HD3, VS (SPLIT SUPPLY) = ±1.65V VOUT, dm = 2V p-p HD2 –88dBc @ 50MHz ཮16ǖၿհ฿ኈᇑೕ୲ڦ࠲ဣă (33) –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 1 10 100 1k FREQUENCY (MHz) S P U R IO U S -F R E E D Y N A M IC R A N G E ( d B c) VOUT, dm = 2V p-p G = 1 G = 10 G = 20 ཮17ǖ฿ኈᇑೕ୲ࢅሺᅮڦ࠲ဣă ADA4939֖ຕ՗ዐڦ฿ኈຕ਍๟ሞሺᅮྺ2้ߴ؜ڦኵLjཚࡗኄ ቧ՗੗ᅜ኱࠵ںԲড߲߳ೕ୲ۅڦْܾࢅෙْၿհ฿ኈă՗3৽๟ ሺᅮྺ2Ăֶݴ๼؜Ӧޗྺ2Vp-p้ڦၿհ฿ኈຕ਍ă ԠLjഄዐLGپ՗੗ᆩ࣍ୟሺᅮă ݣٷഗڦ๼෇(ဃֶۉუ)ԥױᅜᅃ߲ٷڦമၠۉუሺᅮA(s)Lj඗ ࢫཚࡗݒઍဣຕĝدໃڟ๼෇܋Ljምཚࡗۙኝ๼؜๑ဃֶፌၭă ኄᄣLjኄૌݣٷഗڦ࣍ୟሺᅮྺA(s)×ĝăໜጣ࣍ୟሺᅮ(A(s)Lj ĝईଇኁ)ڦইگLjၿհ฿ኈॽሺेăۉუݒઍݣٷഗLjසओݴ ഗLjԥยऺሞ኱ୁࢅگೕ୲تਏᆶٷڦA(s)Lj඗ࢫໜጣ1/fሞࡀۨ ߛೕۅ൵ၠᇀ1ܸ݀ิࡐইăໜጣA(s)ڦࡐইLj࣍ୟሺᅮူইLj฿ ኈሺेăᅺُၿհ฿ኈ֖ຕ๟A(s)ڦڛຕă ۉୁݒઍݣٷഗॽဃֶۉୁᆩፕݒઍ႑ࡽăဃֶۉୁԥױᅜᅃ߲ ٷڦമၠࢻፆT(s)ܸገ࣑ׯ๼؜ۉუLj඗ࢫཚࡗݒઍဣຕ1/RFॽ ๼؜ۉუገ࣑ׯݒઍۉୁLjᅜՍ๑๼෇ဃֶۉୁፌၭăᅺُ૙ၙ ڦۉୁݒઍݣٷഗڦ࣍ୟሺᅮ๟T(s)×(1/ RF)=T(s)/ RFăཞA(s) ᅃᄣLjT(s)ᄺᆶᅃ߲ٷڦ኱ୁኵLjժໜጣೕ୲ڦሺेܸࡐইLjٗ ܸইگ࣍ୟሺᅮLjሺेၿհ฿ኈă ࣍ୟሺᅮ࣏኱থൽਦᇀݒઍဣຕ1/RFă૙ၙۉୁݒઍݣٷഗڦ࣍ ୟሺᅮժփൽਦᇀԿ࣍ۉუሺᅮLjᅺُၿհႠీփࣷໜጣԿ࣍ሺ ᅮڦሺेܸူইăሞํाڦۉୁݒઍݣٷഗዐLj࣍ୟሺᅮඓํగ ዖײ܈ฉൽਦᇀԿ࣍ሺᅮLjڍփࣷٳڟۉუݒઍݣٷഗዐఫᄣڦ ײ܈ă ᅺُܔᇀߛԿ࣍ሺᅮࢅگ฿ኈڦᆌᆩઠຫLjۉୁݒઍݣٷ ഗLjԲසADA4927Lj๟Բۉუݒઍݣٷഗ߸ࡻڦ჋ስăٗ཮17 ੗ᅜੂ؜ໜጣԿ࣍ሺᅮڦሺे฿ኈႠీԍ׼ڥᆶܠࡻă ኄၵຕ਍՗௽Ljၿհ฿ኈໜೕ୲ሺेܸሺेLjժ൐ሞߌ႗඀ټ੻ (50MHz)ాْܾၿհ฿ኈᄲԲෙْၿհ฿ኈሧߞăሞԲߌ႗඀ೕ ୲߸ߛڦೕ୲ۅڦၿհ฿ኈኵডߛLjᅺُ໲்ڦޗ܈੗ీԥဣཥ ೕټ၌዆ࠀీ໯ইگăසࡕဣཥᆶᅃ߲50MHzڦጇ഻๕୳հഗLj ఫ஺৽ኻႴᄲ੊୯גࡗ25MHzڦೕ୲ۅLjᅺྺ߸ߛೕ୲ڦ໯ᆶၿ հॽԥ୳հഗ୳أă৑࠶සُLj࿢்࣏๟ᄲೠࠚೕ୲ፌߛྺ 50MHzڦဣཥLjᅺྺణമڦ໯ᆶ୳հഗܔၿհڦᅞ዆੗ీۼփ ࠕLj฿ኈݴଉ੗ీं࣮۠႑ࡽټ੻ాă཮16ߴ؜କADA4939ሞ ߳ዖۉᇸۉუࢅ2Vp-p๼؜้ڦၿհ฿ኈᇑೕ୲ڦ࠲ဣă 50MHz้ڦْܾၿհ฿ኈ၎ܔᇀ2Vp-p๼෇႑ࡽઠຫٷሀ๟ -88dBcăྺକԲডၿհ฿ኈ຤ೝࢅ1 ENOB LSBLjኄ߲ၿհ฿ኈ ኵՂႷԥገ࣑ׯۉუኵLjසࠅ๕33໯๖ă ኄ߲฿ኈኵኻᆶ80μVp-pLjई1 ENOB LSBڦ16%ăᅺُLjٗ฿ ኈڦঙ܈ੂLj੗ᅜණྺADA4939๟AD9445 ADCൻۯഗڦ࢔ࡻ ჋ስă ᆯᇀADCൻۯഗ๟޶ݒઍݣٷഗLj๼؜฿ኈൽਦᇀݣٷഗۉୟዐ ڦ࣍ୟሺᅮኵă޶ݒઍݣٷഗࠦᆶڦਸ࣍฿ኈॽԥ३ณ1/(1+LG ټ੻ࢅუӦ୲ ټ੻ࢅუӦ୲ሞADCൻۯഗᆌᆩዐ༬՚ዘᄲăᅃӯ൧઄ူLjഗॲ ڦټ੻๟ኸၭ႑ࡽټ੻LjܸუӦ୲࢚ଉڦ๟ٷ႑ࡽӦޗ้ݣٷഗ ๼؜܋ڦፌٷՎࣅ୲ă EUBW(ᆶၳ੗ᆩټ੻)Ljᅃ߲ૌຼᇀENOB(ᆶၳ࿋ຕ)ڦ๯ጴజ ໫୼َLjᆩᇀ௮ຎټ੻ăႹܠADCൻۯഗࢅሏݣጲ׬ᆶ࢔੻ڦټ ੻ኸՔLjڍժփ๟໯ᆶټ੻ۼ๟੗ᆩڦă૩සLj-3dBټ੻๟֪ଉ ټ੻ڦᅃዖدཥݛ݆Ljڍ໲ժփᅪ࿆ጣ໯ᆶټ੻๟੗ᆩڦă-3dB ټ੻ڦޗ܈ࢅ၎࿋ဃֶڦ๑ᆩԲํा“পኹ”ೕ୲ᄲራๆ౎ăఫ஺ ๊஺๟ݣٷഗڦEUBWǛසࢆඓۨ໲ڦٷၭǛඓۨ੗ᆩټ੻ڦᅃ ߲टࡻݛ݆๟ֱკຕ਍๮֩ฉڦ฿ኈ཮ă Analog Dialogue 43-05, 5ሆ(2009) 9 –50 –60 –70 –80 –90 –100 –110 –120 1 10 100 D IS T O R T IO N ( d B c) FREQUENCY (MHz) HD2, G = +1, RF = 200 HD3, G = +1, RF = 200 HD2, G = +2, RF = 402 HD3, G = +2, RF = 402 (34) (35) (36) (37) 80 –80 –60 –40 –20 0 20 6 40 60 90 –270 –225 –180 –135 –90 –45 0 45 1k 10k 100k 1M 10M 100M 1G 10G G A IN ( d B ) P H A S E ( D eg re es ) FREQUENCY (Hz) GAIN PHASE PHASE MARGIN 70° LOOP GAIN = 0dB (6dB)1 + = 2 RF RG ཮19ǖADA4932ਸ࣍ሺᅮޗ܈ࢅ၎࿋ᇑೕ୲ڦ࠲ဣă , ཮18ǖADA4937ۉୁݒઍ႙ADCൻۯഗڦ฿ኈ൸၍ă ཮18՗௽Ljྺକ๑ْܾࢅෙْၿհԍ׼ٷᇀ-80dBcLjኄ߲ADC ൻۯഗփᆌᆩᇀגࡗ60MHzڦೕ୲ăᆯᇀ௅߲ᆌᆩۼփ৑၎ཞLj ဣཥᄲ൱ॽׯྺਏᆶፁࠕټ੻ࢅፁࠕ฿ኈႠీڦࢇ๢ൻۯഗڦ჋ ስጚሶă ړݒઍဣຕփ೅ದ้Ljᆶၳݒઍဣຕ๟ଇ߲ݒઍဣຕڦ०ڇೝ਩ ኵăړ໲்೅ದժԥۨᅭྺĝ้Lj࣍ୟሺᅮ੗ᅜ०ࣅྺA(s)×ĝă ᄲၙ๑ݒઍݣٷഗ࿘ۨLjഄ࣍ୟሺᅮփሎႹڪᇀ-1(၎ړᇀ၎࿋ೋ ᅎ-180°Ăޗ܈ྺ1)ăܔᇀۉუݒઍݣٷഗઠຫLjഄਸ࣍ሺᅮೕ୲ ཮ฉ࣍ୟሺᅮኵڪᇀ1(न0dB)ڦۅኟ๟A(s)ኵڪᇀݒઍဣຕڛຕ ڦںݛă ܔᇀएԨڦݣٷഗᆌᆩLjݒઍ๟كፆႠڦLjሞݒઍ࣍ୟዐփࣷᆅ ෇၎࿋ೋᅎăሞݒઍဣຕ೅ದڦ൧઄ူLjᇑೕ୲࿮࠲ڦݒઍဣຕ ڛຕ1+RF/RGཚ׉ԥ׬ྺሯำሺᅮăසࡕॽᅜdBྺڇ࿋ڦ࢛ۨሯ ำሺᅮᇑਸ࣍ሺᅮA(s)ࣼ዆ሞཞᅃቧ཮ฉLjఫ஺ଇཉ൸၍ڦ঍֮ ۅ৽๟࣍ୟሺᅮྺ1ई0dBڦںݛăሞኄ߲ೕ୲ۅڦA(s)၎࿋ᇑ -180°ኮक़ڦֶኵԥۨᅭྺ၎࿋ᇆଉăྺକ࿘ۨ߾ፕLjኄ߲၎࿋ᇆ ଉᆌٷᇀईڪᇀ45°ă཮19ߴ؜କRF/RG=1(ሯำሺᅮ=2)้ ADA4932ڦڇ࿋࣍ୟሺᅮۅࢅ၎࿋ᇆଉă ৊ᅃօ࠵ִ཮19੗ᅜ݀၄LjADA4932ሞሯำሺᅮྺ1(௅߲࣍ୟ ዐ100%ݒઍ)้ᆶሀ50°ڦ၎࿋ᇆଉă໚඗ඟADCൻۯഗ߾ፕሞ ଭሺᅮᆶۅփൎํाLjڍኄᅃ঳ࡕ՗௽LjADA4932੗ᅜ࿘ۨ߾ፕ ሞၭຕֶݴሺᅮ(සRF/RG=0.25,ሯำሺᅮ=1.25)ăժփ๟໯ᆶֶ ݴADCൻۯഗۼీኄᄣăፌၭ࿘ۨሺᅮ੗ᅜሞ໯ᆶADCൻۯഗ ڦຕ਍๮֩ዐቴڟă ۉୁݒઍADCൻۯഗڦ၎࿋ሺᅮཞᄣ੗ᅜٗਸ࣍ၚᆌዐಒ܏ăۉ ୁݒઍݣٷഗփም๑ᆩമၠሺᅮA(s)Ljܸ๟๑ᆩമၠࢻፆT(s)Lj ժॽဃֶۉୁᆩፕݒઍ႑ࡽăټ೅ದݒઍۉፆڦۉୁݒઍൻۯഗ ڦ࣍ୟሺᅮڪᇀT(s)/RFLjᅺُۉୁݒઍݣٷഗ࣍ୟሺᅮޗ܈ሞ T(s)= RF้ڪᇀ1(न0dB)ăኄ߲ۅሞਸ࣍ࢻፆࢅ၎࿋཮ฉ࢔ඹᅟ ቴڟLjۨ࿋ݛ݆ᇑۉუݒઍݣٷഗ၎ཞăጀᅪLjࣼ዆ۉፆᇑ1kΩ ڦԲኵీ๑ፆኵ՗๖ሞܔຕ཮ฉă཮20ߴ؜କRF=300Ω้ ADA4927ۉୁݒઍֶݴADCൻۯഗڦڇ࿋࣍ୟሺᅮۅࢅ၎࿋ᇆ ଉă უӦ୲Ljᅃዖٷ႑ࡽ֖ຕLjኸڦ๟ݣٷഗ๼؜ሞுᆶࡗߛ฿ኈڦ ൧઄ူీࠕ߶ጷ๼෇ڦፌٷՎࣅ୲ăᅜუӦ୲੊୯ኟ၀հ๼؜ǖ ഄዐdv/dt max๟უӦ୲LjVp๟ރኵۉუLjf ڪᇀ஢ࠀ୲ټ੻ (FPBW)ăླྀ໙FPBWǖ ᅺُLjሞ჋ስADCൻۯഗ้Ljዘۅᄲ੊୯ሺᅮĂټ੻ࢅუӦ୲ (FPBW)Ljᅜඓۨݣٷഗ๟ޏፁࠕ஢ፁᆌᆩᄲ൱ă ࿘ۨႠ ࠲ᇀֶݴADCൻۯഗڦ࿘ۨႠ੊୯ᇑሏݣ๟ᅃᄣڦLj࠲॰֖ຕ๟ ၎࿋ᇆଉă ໚඗༬ۨݣٷഗದዃڦ၎࿋ᇆଉ੗ᅜٗຕ਍๮֩ዐइ ൽLjڍሞํाဣཥዐᆯᇀPCBӲ཮ዐڦसิၳᆌኄ߲၎࿋ᇆଉࣷ ᆶ၂ዸইگă ޶ۉუݒઍݣٷഗڦ࿘ۨႠൽਦᇀഄ࣍ୟሺᅮڦٷၭࢅޙࡽLj A(s)×ĝăֶݴADCൻۯഗᄲԲۆ႙ڦሏݣۉୟฎྲްሗᅃۅLj ᅺྺ໲ᆶଇ߲ݒઍဣຕăሞࠅ๕7ࢅࠅ๕8ڦݴజዐ੗ᅜ९ڟ࣍ ୟሺᅮăࠅ๕37༵ࠃକሞݒઍဣຕփ೅ದ(ĝ1≠ĝ2)൧઄ူڦ࣍ୟ ሺᅮă ࠅ๕34ሞࡗଭۅڦڞຕ(Վࣅ୲)नፌٷՎࣅ୲Lj໲ڪᇀǖ 10 Analog Dialogue 43-05, 5ሆ(2009) 1k 100 10 1 0.3 0.1 50 0 –50 –100 –150 –200 10 100 1k 10k 100k 1M 10M 100M 1G 10G FREQUENCY (Hz) IM P E D A N C E M A G N IT U D E ( k ) IM P E D A N C E P H A S E ( D eg re es ) MAGNITUDE PHASE –135 –180 PHASE MARGIN 45° ཮20ǖADA4927ਸ࣍ሺᅮޗ܈ࢅ၎࿋ᇑೕ୲ڦ࠲ဣă R4 R5 VOCM C1 TO ADC R2 R? R6 R7 C6 C7 U1 RS RT C2 C3 C4 C5 +VS –VS 300Ωݒઍۉፆ຤ೝ၍ᇑࢻፆޗ܈൸၍ڦ঍֮ۅ๟࣍ୟሺᅮྺ0dB ڦںݛăሞኄ߲ೕ୲ۅLjT(s)ڦ၎࿋থৎ-135°Ljᅺُᆶ45°ڦ၎ ࿋ᇆଉă၎࿋ᇆଉࢅ࿘ۨႠໜRFڦሺेܸሺेLjໜRFڦ३ၭܸ३ ၭăۉୁݒઍݣٷഗᆌ๔ዕ๑ᆩਏᆶፁࠕ၎࿋ᇆଉڦكۉፆݒઍă PCBӲ཮ ሞ࿘ۨڦADCൻۯഗยऺࡻࢫLj࣏ՂႷሞPCBฉํ၄ăᆯᇀۉୟ ӱ٪ሞसิׯݴLjጺ๟ࣷ໦฿ᅃၵ၎࿋ᇆଉLjᅺُۉୟӱڦसิ ၳᆌՂႷԍ׼ፌၭLjഄዐ༬՚ᄲ࠲ጀڦ๟޶ሜۉඹĂݒઍ࣍ୟۉ ߌࢅ൱ࢅবۅۉඹă௅ዖसิۉੇۼࣷߴݒઍ࣍ୟሺे׿ውႠ၎ ࿋ೋᅎLjܸٗ३ၭ၎࿋ᇆଉăᆯᇀPCBӲ཮ยऺփଆ੗ీڞዂ 20°ᅜฉڦ၎࿋ᇆଉ໦฿ă ሞ๑ᆩۉუݒઍݣٷഗ้ፌࡻ๑ᆩ৑੗ీၭڦRFLjᅜՍፌၭࣅᆯ RFࢅ൱ࢅবۅۉඹፇׯڦटۅᆅഐڦ၎࿋ೋᅎăසࡕᄲ൱๑ᆩٷ ڦRFLjसิۉඹ੗ᅜᆩੵথ௅߲ݒઍۉፆڦၭۉඹCf৊ႜց׋Lj ܔCfڦᄲ൱๟RFCfڪᇀRGױᅜ൱ࢅবۅۉඹă PCBӲ཮๟ยऺዐፌࢫڦՂᄲօየኮᅃăᅍ࡮ڦ๟Lj໲ᄺ๟ยऺ ዐፌඹᅟԥࢮ๫ڦօየኮᅃLjन๑Ⴀీߛ܈ᅈડᇀӲ཮ยऺڦߛ ໏ۉୟᄺ๟සُăகࢸईጜଝڦӲ཮ยऺ੗ీইگᅃ߲ߛႠీย ऺڦႠీLjฯ዁๑໲փీ߾ፕă໚඗Ԩ࿔࿮݆ࡥ߃ኟඓߛ໏PCB ยऺڦ໯ᆶݛ௬Ljڍ࣏๟ᄲ঻ถᅃၵ࠲॰ۅă सิׯݴॽ໦࡞ߛ໏ۉୟڦႠీăसิۉඹ๟ᆯᇮഗॲڦࡰಎĂ ጽ၍Ăںೝ௬ईۉᇸೝ௬ᆅഐڦăுᆶںೝ௬ڦ׊ጽ၍ॽႚׯस ิۉߌLj৊ܸڞዂຨༀၚᆌዐڦናଯࢅഄ໲փ࿘ۨ၄ၡăसิۉ ඹሞݣٷഗڦ൱ࢅবۅت༬՚ླ၃Ljᅺྺ໲ࣷሞݒઍၚᆌዐᆅ෇ ᅃ߲टۅLjሰׯॖރࢅփ࿘ۨăᅃዖ঴ਦݛӄ๟ඓԍADCൻۯഗ Ҿጎࢅݒઍᇮॲࡰಎူݛ൶ᇘڦ໯ᆶۉୟӱ֫ۼ๟߅৫ڦںࢅۉ ᇸೝ௬ă ᄲ๑ᆶ࡞सิۉੇፌၭLj๯ံᄲ๑໯ᆶጽ၍৑੗ీ܌ăRF-4ᆇ዆ ӱڦྔ֫50Ωጽ၍ׂิڦसิ֖ຕٷሀྺ2.8pF/ᆈ٫ࢅ7nH/ᆈ ٫ăా֫50Ωጽ၍ڦसิۉੇॽሞُएإฉሺेሀ30%ă࣏ᄲඓ ԍሞ׊ጽ၍ူݛᆶںೝ௬Ljᅜ๑ጽ၍ۉߌፌၭăԍ׼܌ၭڦጽ၍ ᆶዺᇀ३ၭसิۉඹࢅसิۉߌ——ժԍ׼ยऺڦྜኝႠă ۉᇸಖୟ๟Ӳ཮ยऺዐଷᅃ߲ዘᄲڦ੊୯ᅺ໎ăඓԍۉᇸಖୟۉ ඹࢅVOCMಖୟۉඹ৑੗ీ੍ৎݣٷഗᆅগݣዃăଷྔLjሞۉᇸ ฉ๑ᆩܠ߲ಖୟۉඹᆶዺᇀඓԍྺ੻ټሯำ༵ࠃگፆੇୟ০ă཮ 21ߴ؜କᅃ߲ټಖୟࢅ๼؜گཚ୳հഗڦۆ႙ֶݴݣٷഗᇱ૙ ཮ăگཚ୳հഗᆩᇀ၌዆৊෇ADCڦټ੻ࢅሯำă૙ၙ൧઄ူLj ۉᇸಖୟۉඹ࣮ୟ੍ৎ޶ሜ࣮ୟLjኄᆶዺᇀ३ၭںೝ௬ዐڦ࣍ ୁLjܸٗ߀฀ADCൻۯഗႠీ(཮22aࢅ཮22b)ă ཮21ǖټۉᇸಖୟۉୟࢅ๼؜گཚ୳հഗڦADCൻۯഗă Analog Dialogue 43-05, 5ሆ(2009) 11 DIGITAL CIRCUITS MIXED SIGNALS VA VD VA VD AGND DGND ANALOG CIRCUITS DIGITAL SUPPLYANALOG SUPPLY DIGITAL CIRCUITS A A D A D D ANALOG CIRCUITS SYSTEM STAR GROUND ፕኁ঻ถ ֖੊࿔၅ 1 Information on al l ADI components can be found at www.analog.com. 2http://designtools.analog.com/dtDiffAmpWeb/dtDiffAmpMain. aspx. 3www.analog.com/en/design-tools/dt-adisim-design-sim-tool/ design-center/list.html. 4www.analog.com/library/analogdialogue/archives/39-09/ layout.html. R2 RT R4 R6 R7 R1 R3 R5 U1 (a) C2 C6 C7 C4 C3 C5 (b) ཮22(a):ഗॲ֨ă(b)ǖۉୟ֨ă ཮23：ंࢇ႑ࡽڦথںݛ๕ă ๑ᆩںೝ௬ࢅᅃӯڦথںरേ๟ᅃ߲ਏ༹ܸްሗڦੜ༶LjփሞԨ ࿔༪ஃڦݔྷኮాăփࡗᆶब߲ᄲۅႴᄲኸ؜Lj९཮22aࢅ཮ 22bă๯ံLjኻሞᅃ߲ۅॽఇెࢅຕጴں૶থሞᅃഐLjऻዿኻ๟ ڇۅথںăኄᄣፔ੗ᅜ๑ںೝ௬ዐఇెࢅຕጴۉୁڦ঍ࢻፕᆩፌ ၭLjܸኄዖ঍ࢻፌዕॽڞዂဣཥዐׂิ“ሯำ”ăଷྔLjᄲॽఇె ۉᇸዕথڟఇెۉᇸೝ௬Ljຕጴۉᇸዕথڟຕጴۉᇸೝ௬ăܔᇀ ंࢇ႑ࡽICLjᄲॽఇె࣮ୟዕথڟఇెںೝ௬Ljॽຕጴں࣮ୟዕ থڟຕጴںೝ௬ă John Ardizzoni [john.ardizzoni@analog.com] ๟ADIࠅິߛ໏၍Ⴀևߛपᆌᆩ߾ײ฾ăJohnሞ 2002౎े෇ADIࠅິLjᆛᆶ28౎ᅜฉڦۉጱႜᄽঢ় ᄓă໱ጉႀࡗႹܠ࿔ቤࢅஃ࿔Lj๟๴࣌ᆓڦRAQဣ ଚڦࢇዸኁኮᅃă ᆶ࠲ߛ໏PCBӲ཮ยऺڦၘဦ༪ஃ൩֖੊A Practical Guide to High-Speed Printed-Circuit-Board Layout4 ă࿢்ထྭړ౞ᆩADC ൻۯഗ৊ႜยऺ้ኄ૛༵ࠃڦ֌ଙᆶዺᇀ౞߸ेඇ௬ں੊୯ዚܠ Ղᄲᅺ໎ă૙঴ֶݴݣٷഗ——ժሞၜణਸ๔้৽ାᅪADCൻۯ ഗยऺڦဦব——ॽ๑ยऺࡗײዐ݀ิڦ࿚༶ፌณLjժ๑౞ᇺ૗ ADCൻۯഗࠤቱă Jonathan Pearson [jonathan.pearson@analog.com] ٗ2002౎8ሆഐ৽๟ADIࠅິߛ໏ݣٷഗևڦᆌᆩ ߾ײ฾ăሞे෇ADIമLj໱๟ۉ႑ႜᄽڦᅃ࿋ఇె ۉୟࢅဣཥยऺ฾ă໱ᆛᆶ۫ԛٷბڦBSEEბ࿋Ă WPIڦMSEEბ࿋ࢅଇၜጆ૧ăأକඤҺॆབྷྔLj ໱࣏ဠ࣌ᄇጾ߳ዖञ໲Ă୤዆ᅼૂᅜत๭णۉጱ࠶ञ໲ݣٷഗࢅ ઻๕๭ᅼऐă