ADC变压器耦合前端设计

AN-935 ᆌᆩԴऻ One Technology Way t P.O. Box 9106 t Norwood, MA 02062-9106, U.S.A. t Tel: 781.329.4700 t Fax: 781.461.3113 t www.analog.com ADCՎუഗ᳘ࢇമ܋ยऺ ፕኁǖRob Reeder Rev. 0 | Page 1 of 8 ՗1 ยऺᄲ൱๖૩ হ၌ ๼෇ፆੇ(Ω) ۉუጂհԲ (VSWR) ཚټೝ།܈ (dB) ዐೕ–3 dBټ੻ (MHz) !႑ሯԲ (SNR)(dBc) ࿮ሗොۯༀݔྷ (SFDR)(dBc) ๼෇ൻۯۉೝ(dBm) ૙ၙኵ 50 1 <0.5 150 72 85 4 ยऺ၌ኵ 30 1.5 <1 300 69 80 7 ०঻ ԨᆌᆩԴऻଚ؜ڦ࿵օୁײ੗ᅜӻዺ܁ኁยऺएᇀߛዐೕ ቏ټᆌᆩڦፌॅADCമ܋ă ሞ၄پཚ႑ဣཥࢅ֪๬ยԢዐLjྺକሞຕጴᇘዐኴႜ႑ࡽ ت૙Ljཚ׉Ⴔ৑੺ॽఇె႑ࡽገ࣑ྺຕጴ႑ࡽă඗ܸLjྺ ఇຕገ࣑ഗ(ADC)ยऺՎუഗമ܋ۉୟඐ੗ీਏᆶᅃۨ཈ ቟ႠLjᆮഄ๟ሞߛዐೕဣཥዐă႞ሏڦ๟LjԨ࿔঻ถڦ࿵ օᆫࣅୁײ੗ᅜӻዺ܁ኁਸ݀ፌॅڦADCമ܋ă޿ୁײᅟ ᇀํแLj੗੺໏ᆌᆩᇀबࢭඪࢆᆌᆩኮዐLjᅜٳڟ໯ႴႠ ీᄲ൱ă ޿࿵օୁײएᇀᅜူ०ڇܸޙࢇஇडڦօየǖ 1. କ঴ဣཥतยऺᄲ൱ă 2. ඓۨADC๼෇ፆੇă 3. ඓۨADCएጚႠీă 4. ߵ਍޶ሜႴᄲ჋ስՎუഗࢅ࿮ᇸፇॲă 5. ܔยऺ৊ႜएጚ֪๬ă ڼ1օǖକ঴ဣཥतยऺᄲ൱ ڼ1օփჾጲ௽Ljڍକ঴༬ۨᆌᆩڦᄲ൱Ljٗᅃਸ๔न჋ ስኟඓڦᇮॲLj੗ٷޗ३ณዘްْຕLjժ੺໏ํ၄໯ႴႠ ీăଚ؜߳ዖยऺᄲ൱LjยۨణՔ߾ፕহ၌ăኄᄣፔᆶ૧ ᇀ੺໏჋ስADCࢅՎუഗă ૩සLj्ย٪ሞᅃ߲ᆌᆩLjᄲ൱֑ᄣ໏୲ྺ61.44 MSPSLjᅜ վइټ੻ྺ20 MHzLjዐ႐ೕ୲ྺ110 MHz)100 MHz዁120 MHz* ڦ႑ࡽăሶᄲ൱႑ሯԲ(SNR)ᄲᆫᇀ72 dBLjᄺ৽ᅪ࿆ጣႴᆩ ᅃ߲14࿋ADCઠ༵ࠃ໯Ⴔ႑ሯԲႠీăࠀࡼᆌگᇀ500 mW/ ཚڢă੺໏໇໭ࢫLj݀၄ADIླྀ؜ڦ14࿋Ă80 MSPS AD9246 ADCీ஢ፁኄၵဣཥपႠీᄲ൱ă޿ഗॲยऺ߾ፕۉუྺ 1.8 V዁3.3 Văኄ੼ഗॲᅺ੻ټ੻ࢅگࠀࡼ)९՗1*ܸԥ჋ዐă ሞ޿๖૩ยऺዐLjADC๼෇ྺ110 MHzዐೕ႑ࡽLjټ੻ྺ20 MHzLj֑ᄣ໏୲ྺ61.44 MSPSăᆯᇀټ੻ড቏)ᅃ߲లઊຯ ༬ೕ܎*Ljᅺܸ֑ᆩକᅃዖၿና೅ದरຍăኄૌ೅ದरຍټ ੻߸گLjڍ੗ሞኸۨೕ୲ݔྷాํ၄ଆࡻ೅ದăኄዖ൧઄ ཚ׉ᄲ൱ॽᅃ߲ۉߌईཎᄟ༹ىዩੵথሞఇె๼෇႑ࡽࢅ ADC๼෇܋ฉLjᅜཚࡗၿናݛ๕๑सิۉඹᇺ૗ADC๼෇ पăසࡕణՔዐೕ࿋ᇀएټ)ڼᅃలઊຯ༬ೕ܎*ኮాLjሶ ੗ᆩ०ڇڦRCྪஏઠํ၄گཚ୳հഗă AN-935 � Rev. 0 | Page 2 of 8 ణ୤ ०঻ .................................................................................................... 1 ڼ1օǖକ঴ဣཥतยऺᄲ൱ ..................................................... 1 ڼ2օǖඓۨADC๼෇ፆੇ .......................................................... 3 ڼ3օǖඓۨADCएጚႠీ .......................................................... 3 ڼ4օǖߵ਍޶ሜႴᄲ჋ስՎუഗࢅ࿮ᇸፇॲ ....................... 3 ڼ5օǖܔยऺ৊ႜएጚ֪๬ ...................................................... 4 ੗჋օየ6 ......................................................................................... 5 ঳ஃ .................................................................................................... 6 ց؊܁࿿ ........................................................................................... 6 �� AN-935 Rev. 0 | Page 3 of 8 R jX VIN– VIN+ ADC INTERNAL INPUT Z PARALLEL CONFIGURATION R jX 06 98 2- 00 1 6.9k 4pF ཮1 ੗ॽADCڦాև๼෇ፆੇੂፕۉፆᇑۉඹڦժ૴ದዃ ՗2 ժ૴ದዃူڦAD9246๼෇ፆੇ1 ֑ᄣఇ๕ ԍ׼ఇ๕ ೕ୲(MHz) R (kΩ) C (pF) R (kΩ) C (pF) 109.02 7.012504 −4.023861 23.621962 −2.219631 109.64 7.001112 −4.020610 23.501558 −2.219192 110.27 6.909521 −4.017265 23.226639 −2.218956 110.89 6.806530 −4.013601 23.724023 −2.218073 111.52 6.750957 −4.012279 23.477964 −2.216845 112.14 6.695931 −4.010091 23.463246 −2.216127 1 ༹ٚႜ՗๖૩ጱยऺዐᆩڟڦኵă 1 ᆶ࠲ADC֪๬ڦ߸ܠ႑တLj൩֖ለAN-835ă CML R L R 33Ω 33Ω 6.9kΩ 4pF 0.1μF 0.1μF0.1μF 0.1μF ~AIN AD9246AIN INPUT Z = 50Ω 0.1μF ADC INTERNAL INPUT Z @ 110MHz XFMR 1:4 Z 06 98 2- 00 2 ཮2 മ܋ᇱ૙཮Ǘ໯჋ۉፆኵࢅۉߌኵՂႷᇑ޶ሜ၎೅ದ ڼ2օǖඓۨADC๼෇ፆੇ ሞୁײڼ2օዐLjႴඓۨADC๼෇ፆੇ)९཮1*ă໯ᆩഗॲ AD9246๟ᅃ੼ݥ࣐؋႙ईኁຫ๟ਸ࠲ۉඹ႙ADCăኄ৽ ᅪ࿆ጣ๼෇ፆੇ๟้ՎڦLjܸ൐ࣷໜጣఇె๼෇႑ࡽڦೕ ୲݀ิՎࣅăඓۨ޿ഗॲڦ๼෇ፆੇ้Lj੗๑ᆩAD9246ׂ ೗ᄻ௬ዐڦۉጱ՗߭ăሞ޿ۉጱ՗߭ዐLjቴڟሞ110 MHzူ ֪ڥڦ߶ጷఇ๕ፆੇăሞ޿૩ዐLjADCాև๼෇޶ሜੂഐ ઠၟᅃ߲6.9 kΩۉፆᇑᅃ߲4 pFۉඹժ૴ăፌࡻሞADC߶ጷ ఇ๕ူ৊ႜ೅ದLjᅺྺኄኟ๟ADCํा֑ᄣڦ้क़ă՗2 ଚ؜କևݴAD9246ׂ೗ᄻ௬ۉጱ՗߭ă ڼ3օǖඓۨADCएጚႠీ ڼ3օ๟ඓۨADCڦएጚႠీLjᅜሞᆫࣅ߳ၜยऺ֖ຕമ ߸ࡻںକ঴ADCڦႠీ՗၄ăྺඓۨኄዖएጚLj൩๑ᆩೠ ࠚӱLjԍ׼ഄఐණದዃփՎăኄ๟ሞׂ೗ຕ਍๮֩໯ଚࡀ ߭ူLjADCፌ੗ీ՗၄؜ઠڦ༬Ⴀă ඗ࢫLjጣ๮๭ण߳ၜႠీኸՔăኄ੗ཚࡗܔೕ୲ྺ110 MHzLj஢ଉײݴԞ(dBFS)ྺ−1 dBڦ๼෇႑ࡽڦ֑ᄣኵፔ੺ ໏ޱ૬ᄾՎ࣑(FFT)Lj঳ࡕ๟႑ሯԲྺ72 dBLj࿮ሗොۯༀݔ ྷ(SFDR)ྺ82.7 dBcLjথৎຕ਍๮֩໯ଚࡀ߭ă֑ण༬Ⴀຕ ਍้Ljᆌ๑ᆩߛႠీ႑ࡽ݀ิഗࢅ୳հഗLjᅜՍሞ֪๬้ ൣأ႑ࡽ݀ิഗዐ٪ሞڦඪࢆၿհࢅሗොׯݴă থူઠLjᅎأ୳հഗժॽADCೠࠚӱዘႎ૶থ዁֪๬႑ࡽ ݀ิഗăᆌዘႎۙবժऻ୤႑ࡽ݀ิഗڦ๼؜ۉೝLjُت ྺ14 dBmLjᅜ֑ण๼෇ൻۯຕ਍ăᆌሞፁࠕڦټ੻ా෢௮ ๼෇ೕ୲Ljᅜକ঴ཚټೝ།܈ڦՎࣅժइڥ–3 dBۅ1ăُ૩ ዐLjമ܋ఐණದዃዐᆶᅃ߲०ڇRC୳հഗLj๑ཚټೝ།܈ ٳ1.2 dBLjټ੻ሀྺ100 MHză ฉຎຕ਍़ᅙ֑णྜԹLj৽ᆌፕᅃၵਦۨକăړᄲ൱႑ሯ Բྺ72 dBĂ࿮ሗොۯༀݔྷྺ83 dBc้LjՂႷ๑ᆩᅃ߲ੇं ۠୳հഗ(AAF)Ljᅜ߀฀ሗොႠీժ๑႑ࡽၿհডگăڍ ኄժփీ঴ਦ๼෇ൻۯࢅཚټೝ།܈࿚༶ăఐණೠࠚӱฉ ڦੇं۠୳հഗ੗๑ణՔཚټ੺໏ປ३ă๑ᆩᅃ߲०ڇڦ ժ૴ۉߌీഐᅃۨፕᆩLjᅺྺሞణՔೕ୲ူLjኄዖഗॲປ ३߸ณLjټྔࡐইႠీ߸ॅăܔᇀ๼෇ൻۯLj੗๑ᆩᅃ߲ 1:4ڦՎუഗLjᅜ๑ADCٳڟ஢ଉײᄲ൱ăՎუഗ੗๑႑ࡽ ሺٷ+6 dBLjᅺܸ੗ᅜ߸ܠںց׋๼෇ൻۯᄲ൱ăፌࢫLjᆌ ᆩ๐ଉྪஏݴဆᅏ(VNA)֪ଉ๼෇ፆੇࢅVSWRă๼෇ణ Քೕ୲Ljକ঴๼෇೅ದ൧઄ăُ૩ዐLj110 MHzူ֪ڥኵྺ 35 ΩLj঳ࡕVSWRྺ1.44:1ă ڼ4օǖߵ਍޶ሜႴᄲ჋ስՎუഗࢅ࿮ᇸፇॲ ڼ4օ๟ߵ਍޶ሜႴᄲ჋ስՎუഗࢅ࿮ᇸፇॲăฉᅃօඓ ૬କएጚLjྺԨօٶူକएإăথူઠLjՂႷ჋ስՎუഗ ࢅRᇑLڦᇮॲኵᅜ೅ದ޶ሜLj඗ࢫᄲሞADCᇑՎუഗْप ኮक़ॺ૬ᅃ߲ీํ၄໯Ⴔጺ༹Ⴀీڦੇं۠୳հഗ)཮2*ă AN-935 � Rev. 0 | Page 4 of 8 ected)Z(Sec Refl al)Z(Prim Ide aedI ceS(Z )l lected)Z(Prim Ref = X 50 200 39.8 = ൱঴XLjX = 251 Ωă 163 .7 Ω 2π 011 zHM 4 Fp 1 2 1 = ×× = π = fC XC X LfL π= 2 LXC X= ᆩኄၵኵ੗ᅜ൱؜Lǖ 325 Hn 2π 011 zHM 163 .7 2 = × = π = f XL C ( ) ኄᅃօ๟ঢ়ᄓईํᄓڦᆩ࿴ኮتăᆯᇀփཞՎუഗڦႠీ ੗ీ٪ሞডٷֶᅴLjᅺܸ჋ስՎუഗ٪ሞᅃۨవ܈ăԨ૩ ໯჋Վუഗڦߵ਍๟LjՎუഗᅙঢ়֪ଉࡗLjഄႠీᄺᅙ౬ ൣăᅃӯܸჾLjᆌ჋ስᅃ߲၎࿋փೝ࢚༬Ⴀ؜෥ڦՎუ ഗLjኄݥ׉ዘᄲă޿๖૩ᆌᆩټ੻ড቏Lj໯Ⴔ๼෇ൻۯ گLjᅺܸ֑ᆩକᅃዖፆੇԲྺ1:4ڦᅙኪՎუഗă ࠲ᇀසࢆྺADC჋ስՎუഗLjᆶᅃၵ०ڇڦኸళLjഄዐᅃ ཉ๟࠲ጀरຍࡀ߭ăԲසLjᆌጮဦԲড࣮໦Ă֭໦ᅜत၎ ࿋ᇑޗ܈փೝ࢚ڪरຍࡀ߭ăසࡕຕ਍๮֩ዐ࿄Քጀኄၵ ֖ຕLj൩ၠ዆ሰฆ໭ൽ၎࠲ຕ਍Ljईᆩ๐ଉྪஏݴဆᅏ৊ ႜ֪ଉă჋ስՔጚཚଉ᳘ࢇՎუഗLj࣏๟჋ስә୿Ljൽਦ ᇀټ੻ᄲ൱ăՔጚՎუഗڦټ੻ᅃӯتᇀ1 GHzईᅜူ൶ क़Ljә୿ሶ੗ํ၄ߛڥܠڦټ੻ă Ⴔጀᅪڦ๟Lj܋থ੗ሞ؛पࢅْपኮक़ݴ૗Ljڍُ૩ዐLj ྺକॽ໯Ⴔᇮॲຕই዁ፌگLjኻॽْप܋থăߵ਍ਏ༹ᆌ ᆩLjݴਸ܋থ੗ీ߸ࢇ๢ă ሞఇె๼෇ዐLjᆌ֑ᆩ15 Ω዁50 Ωڦၭኵز૴ۉፆăԨ૩๑ ᆩକଇ߲33 Ωۉፆăኄᄣፔ๟ྺକ၌዆ٗݥ࣐؋ADC࣮ڟఇ ె๼෇ዐڦۉࢁጀ෇ଉăኄᄣ࣏ᆶዺᇀඓۨઠጲമपڦᇸ ፆੇăሞ90%ڦ൧઄ူLj੗๑ᆩ33 ΩۉፆLjڍํ७ኤ௽Ljᆶ ้߀Վُኵ੗ᅜ୼ྲ༵ืႠీă থူઠLj൱؜Վუഗْपڦ܋ۉፆăऺ໙၂๖Ljܔᇀْप ܸჾLjگᇀ251 Ωڦۉፆྺᅃ߲ডࡻڦഐۅă200 Ω੗ᆩᇀ૙ ၙڦ1:4ፆੇԲՎუഗăਸ๔ऺ໙้Lj൩ᆩኸۨዐ႐ೕ୲ူ ڦ࣮໦ኵઠऺ໙ํा༬ኙፆੇ(Z0)ă ᅜူྺՎუഗْपڦ܋ፆੇऺ໙๖૩ă࣮໦ྺ ࣮໦(RL) = -18.9 dB @ 110 MHzǙ 20 log ᆩ޿࣮໦ኵ੗൱؜Վუഗْपڦ༬ኙፆੇă ഄዐLjZ0 = 39.8 Ωă + − 0 0 Z Z 50 50 ( ) 0 0 Z Z + − = − 50 50 10 20 81 .9 ሞ૙ၙڦ1:4ፆੇՎუഗዐLjْपฉڦ200 Ωᆌڪॏᇀ؛पฉ ڦ50 Ωăڍํाဣཥዐժ࿄සُăྺକඓۨݒพ࣮؛पڦํ ाፆੇLjᆩฉᅃօ൱؜ڦZ0ኵLjժ৊ႜᅜူ०ڇऺ໙ǖ ᆯᇀՎუഗ٪ሞᅃၵփ௽໦ࡼLjᅺܸ251 Ωڦْपڦ܋ۉፆ ࣷܔኄၵ໦ࡼ৊ႜց׋ăኄ๟ᅃ߲ডࡻڦՎუഗْपڦ܋ থኵLjᅜॽኟඓڦፆੇݒพ࣮؛पăኄዖ൧઄ူLjยऺᄲ ൱ኸۨڦ๟50 Ωă থူઠLjՂႷඓۨۉߌኵLLjᆩᇀᅜၿናݛ๕ڸၩాև ADCसิۉඹăኄݥ׉०ڇLjኻႴॽۉඹኵC (4 pF)ยྺLኵ न੗ă ᅜူྺۉߌLऺ໙๖૩ǖ LڦۉੇԥยྺCڦ၎ཞăُ้Ljሞ110 MHz้Lj4 pFۉඹገ ࣑ྺڪᇀ523 nHڦۉߌăኄ৽ྺLኵยۨକᅃ߲ഐۅă ڼ5օǖܔยऺ৊ႜएጚ֪๬ ሞლ൱ፌॅADCՎუഗ೅ದڦࡗײዐLjፌࢫᅃօ๟ᆩᅜമ ߳օ൱؜ڦۉፆኵࢅۉߌኵܔยऺ৊ႜएጚ֪๬ăምْ֪ ଉ߳ၜႠీኸՔ๟࢔ዘᄲڦLj໲்๟႑ሯԲĂ࿮ሗොۯༀ ݔྷĂ๼෇ൻۯĂཚټೝ།܈ࢅ๼෇ፆੇLj৽සമ௬ሞఐ ණཉॲူඓۨADCएጚႠీ้໯ፔڦఫᄣă ኵڥጀᅪڦ๟LjྺइڥፌॅႠీLj൱؜ڦRኵࢅLኵۼ੗ీ ᆶ໯փཞăኄၵኵ੗ీᇑਸ๔้ᅈ਍ࠃᆌฆೋࡻࢅ੗ᆩᇮ ॲٷၭऺ໙؜ڦኵኮक़٪ሞֶᅴăݒްࡗײዐLj੗ᆩۉጱ ՗߭ઠ߶ጷ௅ْՎࣅ൧઄ă �� AN-935 Rev. 0 | Page 5 of 8 0 –10 –20 –30 –40 –50 –60 –80 –70 –90 –100 –110 –120 0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0 06 98 2- 00 3 IN P U T A M P L IT U D E ( d B F S ) FREQUENCY (MHz) @ 110MHz IF SNR = 71.5dBFS SRDR = 83.4dBc @ –1dBFS ཮3 ֑ᆩ๖૩Վუഗۉୟ้LjADC႑ሯԲࢅ࿮ሗොۯༀ ݔྷፌዕ֪๬঳ࡕ 0 –0.5 –1.0 –1.5 –2.0 –2.5 –3.0 –4.0 –3.5 –5.0 –4.5 40 60 80 100 120 140 160 180 200 220 240 06 98 2- 00 4 A M P L IT U D E ( d B F S ) FREQUENCY (MHz) PASS-BAND FLATNESS FROM –0.3dB FROM 100MHz TO 120MHz –3dB BANDWIDTH FROM 50MHz TO 200MHz IN P U T D R IV E L E V E L ( 3. 1d B m ) ཮4 ֑ᆩ๖૩Վუഗۉୟ้LjADC๼෇ൻۯࢅཚټ ೝ།܈ፌዕ֪๬঳ࡕ 06 98 2- 00 5 110MHz = 42 VSWR = 1.2 ཮5 ֑ᆩ๖૩Վუഗۉୟ้LjADC๼෇ፆੇࢅVSWR֪ڥႠీ 163 .7Ω 2π 011 zHM 4 Fp 1 2 1 − ×× = = π = fC XC , ADC૙ၙፆੇ 6.9 kΩ ||4 pF ई (6.9 kΩ + j0)||(0 − j361.7) = (18.9 − j361), ADCፆੇ 163 .5 Ω 2π 011 zHM 325 Hn 1 2 1 − ×× = = π = fL XC , L૙ၙፆੇ (18.9 − j361)||(0 + j361.5) = (6.93 kΩ + j72.8) (6.93 kΩ + j72.8) + (66 + j0) = (6.97 kΩ + j72.8), ཁेଇ߲33 Ωۉፆ Վუഗْपڦ܋ፆੇྺ (6.93 kΩ + j72.8)||(242 + j0) = (234 + j82.1m) ੗ߵ਍ᅜူࠅ๕໙؜ਏ༹ٷၭ (Re2 + jX2)1/2 = 234 Ω සڼ5օᅃᄣLjምᆩ޿Բ૩Lj X 50 200 234 = Ԩ૩ዐLjገ࣑ഗথৎ஢ଉײLj႑ሯԲࢅ࿮ሗොۯༀݔྷت ᇀܮۨణՔኮా)९཮3*ăሞ110 MHz้Lj႑ሯԲথৎ72 dBLj ࿮ሗොۯༀݔྷྺ80 dBcă཮4໯๖ྺ֪ڥڦ๼෇ൻۯ)3.1 dBm*ፌዕႠీ঳ࡕă཮ዐཞ้၂๖Ljሞ50 MHzೕ܎ዐLjཚ ټೝ།܈گᇀ0.5 dBă–3 dBټ੻ྺ150 MHzLj੗஢ፁ๖૩ᄲ ൱Ljժ੗ྺ޿ยऺ༵ࠃ؊ፁڦሗොᅞ዆ీ૰ă ፌࢫLjԨ૩၂๖Lj೅ದ๼෇ۉୟईADCఇెമ܋փڍీ߀ ฀๼෇ൻۯĂཚټೝ།܈)ዐೕཚټ*ࢅ޶ሜݒพࠀ୲ (VSWR)ڪኸՔLjཞ้࣏ీํ၄ᇑຕ਍๮֩ࡀۨ၎ཞڦ ADC႑ሯԲࢅ࿮ሗොۯༀݔྷă ੗჋օየ6 ୁײዐ࣏ᆶᅃ߲੗჋օየ6LjनܔԲऺ໙Ⴀీᇑํा֪ڥ ঳ࡕăፕྺॠᄓLj੗໙؜ፆੇ঳ࡕժᇑ֪ڥኵ৊ႜԲডă ᅜူྺኝ߲๼෇೅ದڦऺ໙๖૩ǖ ൱঴XLjX = 42.7 Ωăኄዖ൧઄ူLj֪๬঳ࡕࢅ໙؜ڦፆੇ ኵݥ׉থৎă ཮5໯๖ྺཚࡗ๐ଉྪஏݴဆᅏ֪ଉڦ๏௢ຯ཮ᇑ๼෇ย ऺڦVSWRፖՔ཮ڦፇࢇă110 MHzူLj๼෇ፆੇሀྺ41 Ωă VSWR๔ዕথৎ1.2:1Ljޙࢇ୳հഗ༬Ⴀă AN-935 � Rev. 0 | Page 6 of 8 ঳ஃ ظॺႎยऺ้ႴጀᅪڦᄲۅԈઔǖܔยऺዐڦዘᄲ֖ຕಇ ႾǗᆩᅃ้ۨक़ઠ዆ۨ๢ړڦဣཥࢅยऺᄲ൱ă ჋ስՎუഗ้ՂႷጀᅪڦ๟LjՎუഗփ৑၎ཞLjԲডփཞ ᇮॲڦፌࡻӸ݆๟ඇ௬କ঴߳ၜՎუഗࡀ߭ăසࡕுᆶ၎ ࠲ࡀ߭Lj൩ၠ዆ሰฆ໭ൽ֖ຕጨଙăߛዐೕยऺ੗ీܔՎ უഗ၎࿋փೝ࢚ݥ׉௺ߌăሞटߛዐೕยऺዐLj੗ీႴᄲ ֑ᆩଇ߲Վუഗईә୿Ljᅜᅞ዆౾ْၿհ฿ኈă ჋ስADC้LjႴඓۨ๟๑ᆩ࣐؋႙࣏๟ݥ࣐؋႙ADCăݥ ࣐؋႙ईਸ࠲ۉඹ႙ADCڦ๼෇ፆੇਏᆶ้ՎႠLjߛዐೕ ้Ljยऺవ܈߸ٷăසࡕ๑ᆩݥ࣐؋႙ADCLj൩๔ዕሞ߶ ጷఇ๕ူ৊ႜ๼෇೅ದLjժ๑ᆩ዆ሰฆྪበฉ༵ࠃڦ๼෇ ፆੇۉጱ՗߭ăन๑ሞߛዐೕူLj࣐؋႙ADCᄺ߸ᅟᇀย ऺLjڍࣷԲݥ࣐؋႙ADCၩࡼ߸ܠࠀ୲ăሞऺ໙RኵࢅLኵ ้Lj൩ጀᅪLjኄ๟߲ডࡻڦഐۅăժݥ߲߳ᆌᆩዐڦ໯ᆶ քਆࢅसิۉඹۼ၎ཞLjᅺُLj൩ጀᅪLj੗ీႴᄲ৊ႜݒ ްยऺLjᅜ஢ፁਏ༹ᆌᆩڦႠీᄲ൱ă ց؊܁࿿ AN-742Ljਸ࠲ۉඹADCڦೕ୲ᇘၚᆌă AN-827Ljݣٷഗᇑਸ࠲ۉඹADCথ੨ڦ೅ದݛ݆ă AD9215ĂAD9226ĂAD9235ĂAD9236ĂAD9237ĂAD9244 ࢅAD9245ڦADCਸ࠲ۉඹ๼෇ፆੇ)S-֖ຕ*ຕ਍ă൩മྫ ၎ᆌׂ೗ᄻ௬Ljۅऍ“ೠࠚӱ”(Evaluation Boards)Lj඗ࢫူ ሜMicrosoft Excelۉጱ՗߭ă Rob Reeder, “Transformer-Coupled Front-End for Wideband A/D Converters,” Analog Dialogue 39-2, 2005, pp.3-6. Rob Reeder, Mark Looney, and Jim Hand, “Pushing the State of the Art with Multichannel A/D Converters,” Analog Dialogue 39-2, 2005, pp. 7-10. Walt Kester, “Which ADC Architecture is Right for Your Application?”Analog Dialogue 39-2, 2005, pp. 11-18. Rob Reeder and Ramya Ramachandran, “Wideband A/D Converter Front-End Design Considerations—When to Use a Double Transformer Configuration,” Analog Dialogue 40-3, 2006, pp. 19-22. Rob Reeder and Jim Caserta, “Wideband A/D Converter Front-End Design Considerations:Amplifier- or Transformer Drive for the ADC,” Analog Dialogue 41-1, 2007, pp. 6-12. Analog Devices (www.analog.com)LjAD9246Lj80 MSPS/ 105 MSPS/125 MSPSĂ14࿋Ă1.8 Vਸ࠲ۉඹ႙ADCຕ਍๮֩ă Mini-CicuitLjADT1-1WTຕ਍๮֩ă M/A-COMLjETC4-1T-7ࢅETC1-1-13ຕ਍๮֩ă �� AN-935 Rev. 0 | Page 7 of 8 ጀ๥ AN-935 � Rev. 0 | Page 8 of 8 ጀ๥ ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. AN06982-0-9/07(0)