AN-837: 基于DDS的时钟抖动性能与DAC重构滤波器性能的关系[中文版] (Rev. 0)

AN-837
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
एᇀDDS‫้ڦ‬ዓ۶‫ۯ‬ႠీᇑDACዘࠓ୳հഗႠీ‫࠲ڦ‬ဣ
ፕኁǖDavid BrandonࢅKen Gentile
ዘࠓ୳հഗ๟ٗ኱থຕጴೕ୲ࢇ‫ׯ‬ഗ)DDS*ׂิ߅৫‫گڦ‬
۶‫้ۯ‬ዓ႑ࡽ‫ڦ‬ዘᄲևॲăዘࠓ୳հഗᆩᇀሞDAC‫ڦ‬๼‫؜‬
‫܋‬ປ३৥ၟೕ୲ă‫ڍ‬๟Lj࿿૙୳հഗ࿮݆ሞ࿮၌ೕ୲‫ྷݔ‬
ాํ၄૙ၙ‫ڦ‬ፆ‫ټ‬ᅞ዆ăኄ๟ᆯഗॲसิၳᆌᅜतᆇຘ‫ۉ‬
ୟӱքਆ‫ڦ‬࿿૙၌዆ᆅഐ‫ڦ‬ăසࡕ࿄ీ๑ᆩਏᆶ؊‫ݴ‬ፆ‫ټ‬
ᅞ዆‫ڦ‬ዘࠓ୳հഗLj੗ీࣷই‫گ‬DDS‫ڦ‬Ⴀీă
ADIࠅິ࣏༵ࠃದ༫ᆌᆩԴऻAN-823LjᆌᇑԨᆌᆩԴऻᅃ
ཞፕྺ֖੊ă
୳հഗքਆํᄓ!
ཚࡗᅜူࠅ๕Lj੗ऺ໙ඪࢆ໯Ⴔ৥ၟೕ୲၎‫ܔ‬ᇀfOUT‫ڦ‬૙
ஃ‫)܈ޗ‬dBc*Ljഄዐf๟৥ၟೕ୲LjfC๟DAC֑ᄣ໏୲ǖ
๑ᆩDDSׂิ้ዓ႑ࡽ้LjDAC৥ၟೕ୲ປ३փፁࣷჹዘ
ᆖၚဣཥዜ೺Ⴀ۶‫ۯ‬Ⴀీăሞ‫܈ޗ‬ፏთsin(x)/xၚᆌ൸၍‫ڦ‬
൧઄ူLj৥ၟೕ୲૙ஃฉ੗કቛ዁࿮၌ೕ୲ă཮1໯๖ྺ
DAC๼‫؜‬ೕ೷ă
ԨᆌᆩԴऻ঻ถକᅃ߲୳հഗքਆํᄓ‫ڦ‬঳ࡕժ༪ஃքਆ
ࢅഗॲ჋ስ‫ܔ‬ፆ‫ټ‬ᅞ዆‫ڦ‬ᆖၚăُํᄓ࠲ጀ‫ڦ‬ዘ‫ۅ‬๟Ԩᆌ
ᆩԴऻዐ঻ถ‫ڦ‬ෙዖLC‫گ‬ཚ୳հഗքਆLjन୳հഗAĂ୳
հഗBࢅ୳հഗCăෙዖ୳հഗሞᇮॲኵࢅ໯Ⴔၚᆌ༬Ⴀ‫ݛ‬
௬बࢭྜඇ၎ཞăํᄓణ‫ڦ‬๟ߵ਍ഗॲ‫ڦ‬࿿૙քਆࢅ࿿૙
঳ࠓ၌ۨํᄓՎଉ‫ྷݔڦ‬ă
fOUT
0Hz
fC – fOUT
fC + fOUT
2fC – fOUT
2fC + fOUT
fC
3fC – fOUT
2 fC
3 fC
FIRST
IMAGE
SECOND
IMAGE
THIRD
IMAGE
FOURTH
IMAGE
SYSTEM CLOCK
FREQUENCY (Hz)
FIFTH
IMAGE
3fC + fOUT
SIXTH
IMAGE
05956-001
SIGNAL AMPLITUDE
sin x/x ENVELOPE
x = π (f/fC)
཮1. DAC๼‫؜‬ೕ೷
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
AN-837
ణ୤
୳հഗքਆํᄓ ............................................................................. 1
ዘࠓ୳հഗ‫ڦ‬ዘᄲႠ ..................................................................... 3
‫ݴ‬૬LC‫گ‬ཚ୳հഗยऺ ............................................................... 3
!
ഗॲ჋ስ .................................................................................. 3
‫ݴ‬૬LC‫گ‬ཚྈᇶ୳հഗ‫ํڦ‬၄‫ ݆ݛ‬......................................... 3
୳հഗํᄓ঳ࡕ ............................................................................. 4
୳հഗᇱ૙཮ .................................................................................. 7
୳հഗ‫֌ڦ‬ଙൣ‫ ڇ‬......................................................................... 7
PCB୳հഗքਆ੊୯ ..................................................................... 8
঳ஃ ................................................................................................... 8
Rev. 0 | Page 2 of 8
AN-837
ዘࠓ୳հഗ‫ڦ‬ዘᄲႠ
཮2໯๖ྺ࿮ዘࠓ୳հഗ้֪‫ڦڥ‬৥ၟೕ୲ࠀ୲೷ă໯๖
‫ڦ‬৥ၟೕ୲ປ३ྜඇ๟ᆯDAC๼‫ڦ؜‬sin(x)/xၚᆌᆅഐ‫ڦ‬ă
ኄၵ৥ၟᆶ้੗ᆩፕ႑ࡽLjኄዖ൧઄ူႴᄲ‫ټ‬ཚ୳հഗLj
ܸ‫گݥ‬ཚ୳հഗăሞ཮2‫ڦ‬ೕ೷൸၍཮ዐLjDDS֑ᄣ้ዓ
(fC)๟200 MHzLjfOUTยዃྺ10 MHză
RBW
VBW
SWT
200kHz RF ATT 30d
20kHz
640ms UNIT
dBm
‫ݴ‬૬LC‫گ‬ཚ୳հഗยऺ
0
‫ݴ‬૬LC‫گ‬ཚ୳հഗ‫ํڦ‬แ‫ׯ‬Ԩড‫گ‬Ljժ൐ਏᆶডഽ‫ڦ‬ଳऄ
Ⴀăٗഗॲ჋ስ‫ڦ‬ঙ‫܈‬ઠੂLjᄲํ၄ፌᆫ‫ڦ‬ཚ‫ࢅټ‬ፆ‫ټ‬Ⴀ
ీLj๯ံᄲ჋ስਏᆶডߛጲၿናೕ୲ࢅডߛQ༬Ⴀ‫ڦ‬ഗ
ॲăਏᆶডߛQ‫ۨܮ‬ኵ‫ڦ‬ഗॲ‫ڦ‬ᆫ‫ۅ‬๟ഄ‫૴ز‬Rኵড‫گ‬ă
ሞ‫گ‬ཚ୳հഗዐLjኄዖ༬Ⴀ੗ᅜ३ณ‫෇֭ڦߌۉ૴ز‬໦ࡼ
ժই‫گ‬ಖୟ‫ۉ‬ඹ‫ڦ‬ፆੇă჋ስਏᆶߛQࢅߛጲၿናೕ୲‫ڦ‬
ഗॲ๟ᅃၜ೤ᆶవ‫ڦ܈‬ඪခăᅃӯܸჾLjߵ਍ࠓॺ‫ۉ‬ඹࢅ
‫ߌۉ‬໯ภत‫ڦ‬࿿૙ბᇱ૙LjߛQࢅߛጲၿናೕ୲ྫྫ๟ࢻ
؈֖ຕăྺइ‫ڥ‬ፌॅႠీLjՂႷ৉ั჋ስഗॲă
–10
AMPLITUDE (dBm)
–20
–30
–40
–50
–60
–70
–80
START 0Hz
100MHz
STOP 1GHz
ഗॲ჋ስ
05956-002
–90
–100
SAWĂৗናĂ༩ٍईᇨ‫ހ‬ጎLC୳հഗ‫ڪ‬၄ᆶ୳հഗ਩๢ࢇ
ᆩፕዘࠓ୳հഗă‫ڍ‬๟Lj჋ስ୳հഗૌ႙ኮമLjᄲጮဦඓ
ණ୳հഗ዆ሰฆ‫ڦ‬ຕ਍๮֩ዐࡀۨ‫ڦ‬ፆ‫ټ‬ᅞ዆ࢅ֭෇໦
ࡼăፆ‫ټ‬ᅞ዆‫ڦ‬रຍࡀ߭๔ዕኍ‫ܔ‬ᆶ၌‫ࠃ༵੻ټ‬ăُ‫੻ټ‬
੗ీࡗ቏Lj࿮݆ඓۨ๟‫ޏ‬๢ᆩᇀঢ়ࡗકቛ‫ڦ‬ፆ‫ټ‬ᅞ዆ăኄ
ዖ൧઄ူLjᄲሞፌዕ჋ስኮമඓණ୳հഗፆ‫ټ‬Ⴀీă
཮2. ࿮ዘࠓ୳հഗ‫ڦ‬৥ၟೕ୲๖૩
ُ൸၍཮(཮2)՗௽କ๑ᆩਏᆶ؊‫ݴ‬ፆ‫ټ‬ᅞ዆‫ڦ‬ዘࠓ୳հഗ
‫ڦ‬ዘᄲႠă൩ጀᅪLj৥ၟೕ୲ዐࡤᆶড‫ీٷ‬ଉLjՂႷၩ
‫أ‬Ljܸኄၜඪခᅈ੍୳հഗ‫ڦ‬ፆ‫ټ‬Ⴀీन੗ྜ‫ׯ‬ăᅍ࡮‫ڦ‬
๟Ljሞํा֡ፕዐLj‫ړ‬ೕ୲ᇺᇺ‫؜ג‬ཚ‫้ټ‬Lj୳հഗ‫ڦ‬ፆ
‫ټ‬ᅞ዆Ⴀీ৽ࣷူইăኄ๟ᆯ‫ݥ‬૙ၙഗॲࢅᆇຘ‫ۉ‬ୟӱ
(PCB)ฉഗॲ‫ڦ‬࿿૙քਆᆅഐ‫ڦ‬ă૩සLjํा๑ᆩ‫ۉڦ‬ඹ
ࢅ‫ߌۉ‬ժփྜඇਏᆶඹႠईߌႠă
ස཮3໯๖Lj௅ᅃዖఇ႙਩੗ԈઔፆႠ)R*ĂߌႠ)L*ࢅඹႠ
)C*ᇮॲăᆯኄၵఇ႙੗௽၂ੂ‫؜‬Lj٪ሞᅃ߲ᆯLࢅCፇࢇ
ࠓ‫ڦׯ‬ጲၿናഗॲࢅᅃ߲ᆯRᆅഐ‫෇֭ڦ‬໦ࡼഗॲă
IDEAL MODE
REAL MODEL
(FIRST ORDER)
C
L
C
L
R
L
჋ስ֭෇໦ࡼডၭ‫ڦ‬ഗॲ੗ሞ୳հഗ๼‫ڦٷ߸ࠃ༵܋؜‬႑
ࡽ‫܈ޗ‬ă‫ڦ܈ޗ‬ই‫ࣷگ‬኱থᆖၚ๼‫؜‬႑ࡽ‫ڦ‬უӦ୲ă༵ߛ
থ๭ഗईೝ‫ݛ‬ഗ‫ڦ‬๼෇უӦ୲੗ই‫ټ੻گ‬ሯำăැᄲၘဦ
କ঴้Ⴞ۶‫ူৣ࣍ۯ‬႑ࡽ‫ڦ܈ޗ‬ዘᄲႠLj൩֖੊AN-823ă
‫ݴ‬૬LC‫گ‬ཚྈᇶ୳հഗ‫ํڦ‬၄‫݆ݛ‬
ᅃӯླྀ४๑ᆩྈᇶၚᆌ୳հഗई੊ܻၚᆌ୳հഗፕྺLC‫گ‬
ཚዘࠓ୳հഗăᇑഄ໱ၚᆌૌ႙၎ԲডLjሞߴۨްሗ‫)܈‬न
୳հഗ঩ຕ*‫ڦ‬൧઄ူLjྈᇶ୳հഗ੗༵ࠃፌ੺‫ڦ‬ཚ‫ټ‬዁ፆ
‫ټ‬ገ࣑ă
R
཮3. ૙ၙఇ႙ᇑํाఇ႙
05956-003
C
߳ഗॲ‫ڦ‬ጲၿናೕ୲ᆯᇮॲኵतഄ࿿૙঳ࠓਦۨă჋ስ؅
٫ডၭ‫ހڦ‬ጎཚ‫׉‬๟ডॅ‫ڦ‬჋ስăডၭ‫ހڦ‬ጎᅃӯਏᆶ߸
ߛ‫ڦ‬ጲၿናೕ୲ժ३ณᇑPCBքਆ၎࠲‫ڦ‬सิၳᆌă‫ܔ‬ᇀ
ಖୟ‫ۉ‬ඹLj੗๑ᆩᇮॲኵৈྺᇱ๔ᇮॲኵᅃӷ‫ڦ‬ଇ߲ժ૴
‫ۉ‬ඹॽጲၿናླྀ዁߸ߛ‫ڦ‬ೕ୲ăُरຍ‫ڦ‬ᆖၚሞ୳հഗํ
ᄓ঳ࡕև‫ݴ‬ዐᇎᅜຫ௽ă
ᅺྺഗॲ‫ڦ‬ጽ၍ࡰಎኮक़٪ሞसิ‫ۉ‬ඹLjसิ‫ۉ‬ඹࣷ࿮ᅪ
क़ॽ႑ࡽٗ๼෇᳘ࢇ዁๼‫؜‬Lj໯ᅜ୳հഗքਆࣷ၂ዸᆖၚ
ፆ‫ټ‬ᅞ዆ăᄲํ၄ፌᆫ‫ڦ‬ፆ‫ټ‬ᅞ዆LjႴᄲཞ้‫ܔ‬ഗॲ჋ስ
ࢅքਆဦবेᅜ࠲ጀăೠࠚ୳հഗ‫ڦ‬ፆ‫ټ‬Ⴀీ้Ljᆌᅜᇺ
‫؜ג‬ഄยऺገችೕ୲‫ڦ‬ೕ୲৊ႜ֪ଉLjᅜඓԍ৥ၟೕ୲ీ
‫ڟڥ‬؊‫ݴ‬ᅞ዆ăॺᅱᆌሞೕ୲‫ڟٳ‬ຕഥቹࢍई዁ณ‫ڟٳ‬5 fC
้࠵ִፆ‫ټ‬ᅞ዆ă
Rev. 0 | Page 3 of 8
AN-837
཮5໯๖ྺժ૴૶থĂ೿঩ĂྈᇶĂ‫گ‬ཚLC୳հഗă
05956-005
ُ༬Ⴀ๑ྈᇶ୳հഗ‫ྺׯ‬ዘࠓ୳հഗ‫ڦ‬૙ၙ‫ݛ‬ӄă཮5໯
๖ྺ੊ܻĂൎԲდ‫ސ‬Ăә༬࿦ጦࢅԞ෗ܻኄ຺ዖएԨ୳հ
ഗ‫ڦ‬ᅃፇਏᆶ‫پ‬՗Ⴀ‫ڦ‬ၚᆌ൸၍ă!
0dB
཮5. ժ૴૶থLC୳հഗ
CHEBYSHEV AND CAUER PASS BAND RIPPLE
–3dB
MAGNITUDE (dB)
୳հഗํᄓ঳ࡕ
཮7၂๖କٗԈࡤ୳հഗAĂ୳հഗBࢅ୳հഗC‫ํڦ‬ᄓ୳
հഗӱዐइ‫ڦڥ‬঳ࡕă߳൸၍཮ዐ‫ۥڦ‬և൸၍๟୳հഗ֪
‫ڦڥ‬ೕ୲ၚᆌǗ‫ڹ‬և൸၍๟ঢ়ࡗํᄓ୳հഗࢫDDSೠࠚӱ
֪‫ڦڥ‬ೕ೷ă
CAUER
CHEBYSHEV
֪ଉದዃස཮6໯๖ă
BUTTERWORTH
FREQUENCY
PASS BAND
CORNER FREQUENCY
05956-004
BESSEL
DDS EVALUATION BOARD
AVDD
཮4. ຺ዖएԨ୳հഗ‫ڦ‬ၚᆌ൸၍
1:1
ADTT1-1
DDS
AVDD
EXPERIMENTAL
FILTER BOARD
SPECTRUM
ANALYZER
05956-009
ྈᇶၚᆌీ༵ࠃ۸ോࡐইLj‫پڍ‬ॏ๟ཚ‫ࢅټ‬ፆ‫ټ‬ዐࣷ‫؜‬၄
࿖հă൩ጀᅪLj཮5໯๖ཚ‫ټ‬࿖հ‫ྺ܈ޗڦ‬ໜᅪࣼ዆Ljৈ
ᆩᇀᄇ๖ă໚඗ྈᇶ୳հഗยऺዐవ௨ࣷ‫؜‬၄ᅃၵཚ‫ټ‬࿖
հLj‫ڍ‬໲๟୳հഗยऺටᇵ੗ᅜ੦዆‫ڦ‬ᅃၜ֖ຕăᅺُLj
ഄ‫܈ޗ‬ൽਦᇀਏ༹୳հഗยऺă!
AVDD
཮6. ֪ଉದዃ
ཚ‫ټ‬࿖հ੗ᆖၚగၵEETᆌᆩăሞሜհ႑ࡽׂิ‫ڇڪ‬ᅼᆌ
ᆩዐLjཚ‫ټ‬࿖հժ‫࠲ݥ‬॰֖ຕă‫ڍ‬ሞగၵᆌᆩዐLjࣷᆩ
EETׂิۙ዆ሜհLjኄ้৽ՂႷॽཚ‫ټ‬࿖հ๫ྺ୳հഗย
ऺ‫࠲ڦ‬॰ᅺ໎ă!
൩ጀᅪLjDDSೠࠚӱాዃᅃ߲‫੻ټ‬ሀྺ300 MHz‫ڦ‬๼‫؜‬᳘
ࢇՎუഗăᅺُLjᆯᇀ޿Վუഗ‫ڦ‬ၚᆌLj‫ړ‬ೕ୲ߛᇀ300
MHz้Lj֪‫ڦڥ‬ೕ೷ዐ٪ሞ‫ྔܮ‬ປ३ă
MD୳հഗߵ਍ൻ‫ۉۯ‬ୟ๟‫ୁۉ‬ᇸ࣏๟‫ۉ‬უᇸܸ‫ྺݴ‬ଇዖႚ
๕ăසࡕᆯ‫ୁۉ‬ᇸൻ‫ۯ‬Ljሶ‫ڼ‬ᅃᇮॲྺժ૴૶থLjܸ‫ܔ‬ᇀ
‫ۉ‬უᇸLj‫ڼ‬ᅃᇮॲྺ‫૶૴ز‬থă
ኄෙዖLC‫گ‬ཚྈᇶ୳հഗ‫ํڦ‬၄‫ݛ‬ӄ՗௽PCBքਆࣷᆅഐ
৥ၟᅞ዆Վࣅăෙዖ‫ݛ‬ӄํ၄‫ۼڦ‬๟๑ᆩ‫ݴ‬૬LCഗॲ‫ڦ‬೿
঩ĂྈᇶĂ160 MHz‫گ‬ཚ୳հഗă
߳൸၍཮ዐঢ়DDS୳հ‫ڦ‬๼‫؜‬ೕ୲‫ۼ‬ยዃྺ110.123 MHzLj
DAC֑ᄣ໏୲ྺ500 MSPS)REFCLK*ă൩ጀᅪLjՎუഗ
)Mini-Circuits®༵ࠃ‫ڦ‬ADTT1-1*ᅜֶ‫ݴ‬ႚ๕᳘ࢇDDS๼
‫؜‬ăՎუഗ๼‫؜‬ᇑ୳հഗ๼෇ํ၄‫૶܋ڇ‬থă
Rev. 0 | Page 4 of 8
AN-837
FILTER LAYOUT
C1
C2
C3
L1
C4
FILTER A
C5
L2
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
C6
C7
C8
L3
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
C9
C10 C11
FILTER A
RESPONSE
0Hz
C1
L1
C2
C3
FILTER B
L2
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
C4
C5
C6
L3
C7
C5
FILTER C
L3
C7
L1
L2
C4
C6
C2
C3
DDS FILTERED
OUTPUT
350MHz
3.5GHz
FILTER B
RESPONSE
0Hz
350MHz
3.5GHz
DDS FILTERED
OUTPUT
IMAGES
0Hz
C1
3.5GHz
IMAGE
0Hz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
350MHz
350MHz
3.5GHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
FILTER C
RESPONSE
0Hz
350MHz
3.5GHz
IMAGES
DDS FILTERED
OUTPUT
0Hz
350MHz
཮7. ୳հഗAĂ୳հഗBࢅ୳հഗC‫ํڦ‬ᄓ঳ࡕ
Rev. 0 | Page 5 of 8
3.5GHz
05956-006
FILTER BOARD
AN-837
JitterUI peak to peak
§ N dBcn ·
1
arctan¨¨ ¦10 20 ¸¸
©n1
¹
ُྔLj޿൸၍཮ժփภतໜऐ۶‫ۯ‬࿚༶LjഄၳᆌՂႷ‫܀ڇ‬
੊୯ă
§ dBc ·
1
arctan¨¨10 20 ¸¸
¹
©
ഄዐLjdBc๟၎‫ܔ‬ᇀएհ‫ڦ܈ޗ‬ሗො‫܈ޗ‬ă
ُࠅ๕൸၍཮ස཮8໯๖ă۶‫ۯ‬՗๖ྺ‫ރރ‬ኵ‫ڇ‬࿋क़߰
(UI)ăᅃ߲UIྺᅃ߲၎࠲้ዓ႑ࡽዜ೺ăᆩUI՗๖۶‫ۯ‬Lj
੗๑޿൸၍཮๢ᆩᇀඪᅪ้ዓ႑ࡽă૩සLjසࡕᅃ้߲ዓ
႑ࡽਏᆶ−35 dBc‫ݥ‬ၿհሗොLjሶ੗ᅜᇨ೺ৈᆯ޿ሗොन੗
ᆅഐሀ0.006 UI‫ރރڦ‬ኵ۶‫ۯ‬ă
्้ۨዓೕ୲๟100 MHzLjሶ1 UIྺ10 nsLjᅺُ‫ܔ‬ᇀᅃ߲
100 MHz ้ዓLj0.006 UI‫ڪ‬ᇀ60 ps(0.006 × 10 ns)ă๑ᆩُ൸
၍཮้Ljൎऻ۶‫ۯ‬ኵ๢ᆩᇀ‫ڇ‬ሗො‫ݴ‬ଉă٪ሞ‫߲ܠ‬ሗො
้Ljമ๕໯๖‫ڦ‬arctanࡧຕጲՎଉዐՂႷ‫ܔ‬௅߲ሗො‫ࠋڦ‬
၅൱ࢅă
Rev. 0 | Page 6 of 8
0.020
0.019
0.018
0.017
0.016
0.015
0.014
0.013
0.012
0.011
0.010
0.009
0.008
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0
–25 –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85
SPUR MAGNITUDE (dBc)
཮8. ้Ⴞ۶‫ۯ‬ᇑሗො߅ඡ‫࠲ڦ‬ဣ
05956-007
JitterUI peak to peak
૩සLjᇑN߲ሗො၎࠲‫ރރڦ‬ኵ۶‫ࠅۯ‬๕සူǖ
TIMING JITTER PEAK-TO-PEAK (dBc)
཮7໯๖୳հഗ֪‫ڦڥ‬ೕ୲ၚᆌྺ0 Hz዁3.5 GHz(֪ଉᅏഗ
‫ڦ‬ೕ୲ฉ၌)ă‫ܔ‬ᇀ1 GHz DDSLjॺᅱॽ֪ଉೕ୲કቛ዁3.5
GHzᅜฉLjᅜ߸ࡻ‫ں‬ඓۨ୳հഗፆ‫ټ‬ၚᆌ‫ڦ‬༬Ⴀă
ሞႴᄲट‫گ‬۶‫ڦۯ‬ᆌᆩዐLj؊‫ݴ‬ᅞ዆DAC৥ၟೕ୲‫࠲׉ݥ‬
॰ăํाฉLj‫ݥ‬ၿհೕ೷ሗො‫܈ޗڦ‬ᇑ໯ׂิ‫ڦ‬ዜ೺Ⴀ۶
‫ۯ‬ኮक़٪ሞ኱থ࠲ဣLjࠅ๕සူǖ
AN-837
୳հഗᇱ૙཮
୳հഗ‫֌ڦ‬ଙൣ‫!ڇ‬
FILTER A
SCHEMATIC
C2
5.6pF
C1
5.6pF
L1
39nH
C3
12pF
L2
56nH
C5
12pF
C4
12pF
C6
6.8pF
C8
15pF
C7
15pF
୳հഗA‫֌ڦ‬ଙൣ‫ڇ‬ස՗1໯๖Lj୳հഗBࢅ୳հഗC‫֌ڦ‬
ଙൣ‫ڇ‬ස՗2໯๖ăኄၵ֌ଙൣ‫ڇ‬Ⴔᄲጀᅪᅜူब‫ۅ‬ǖ
L3
68nH
C9
2.2pF
C11
10pF
t ໯ᆶ֌ଙ‫ڦ‬ຕଉ਩ྺ1ă
C10
10pF
t ໯ᆶ֌ଙ‫ڦ‬؅٫਩ྺ0402ă
t ໯ᆶ֌ଙ਩ᆯዪ๕ࣷม٩གྷ዆ፕ໯ิׂă!
FILTER B AND C
SCHEMATIC
C1
12pF
C2
12pF
L2
56nH
C3
27pF
C4
6.8pF
L3
68nH
C5
33pF
C6
2.2pF
C7
22pF
05956-008
L1
39nH
཮9. ୳հഗAᇱ૙཮ᇑ୳հഗBࢅ୳հഗCᇱ૙཮‫ڦ‬Բড
՗1. ୳հഗA֌ଙൣ‫ڇ‬
֖੊Պࡽ!
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
L1
L2
L3
ኵ!
5.6 pF
5.6 pF
12 pF
12 pF
12 pF
6.8 pF
15 pF
15 pF
2.2 pF
10 pF
10 pF
39 nH
56 nH
68 nH
ࠃᆌฆׂ೗႙ࡽ
GRM1555C1H5R6DZ01
GRM1555C1H5R6DZ01
GRM1555C1H120JZ01
GRM1555C1H120JZ01
GRM1555C1H120JZ01
GRM1555C1H6R8DZ01
GRM1555C1H150JZ01
GRM1555C1H150JZ01
GRM1555C1H2R2CZ01
GRM1555C1H100JZ01
GRM1555C1H100JZ01
LQG15HS39NJ02D
LQG15HS56NJ02D
LQG15HS68NJ02D
ኵ!
12 pF
12 pF
27 pF
6.8 pF
33 pF
2.2 pF
22 pF
39 nH
56 nH
68 nH
ࠃᆌฆׂ೗႙ࡽ
GRM1555C1H120JZ01
GRM1555C1H120JZ01
GRM1555C1H270JZ01
GRM1555C1H6R8DZ01
GRM1555C1H330JZ01
GRM1555C1H2R2CZ01
GRM1555C1H220JZ01
LQG15HS39NJ02D
LQG15HS56NJ02D
LQG15HS68NJ02D
՗2. ୳հഗBࢅ୳հഗC֌ଙൣ‫ڇ‬
֖੊Պࡽ!
C1
C2
C3
C4
C5
C6
C7
L1
L2
L3
Rev. 0 | Page 7 of 8
AN-837
PCB୳հഗքਆ੊୯
঳ஃ
ᅜူଚ‫؜‬କ੗๑ዘࠓ୳հഗइ‫ڥ‬ፌॅႠీ‫ํڦ‬ᆩքਆर
േă
DDS๟ᅃዖຕ਍֑ᄣဣཥLjഄׂิ‫ڦ‬ೕ೷ሞ֑ᄣೕ୲‫ڦ‬Ԡ
ೕ޹ৎಇଚጣ‫߲ܠ‬एհă
t
ሞഗॲူ௬๑ᆩํ႐)փक़܏*থ‫֫ں‬ઠই‫ۉگ‬ୟ‫࣍ڦ‬
ୟ‫ߌۉ‬Ljܸٗই‫ୁۉ࣮ݓگ‬ୟ০‫ڦ‬ፆੇă
t
୳հഗAዐLjॽᅃ߲Shunt‫ۉ‬ඹᆩଇ߲ၭ‫ۉ‬ඹઠํ၄)֖
९཮7)ઠ༵ߛ‫ۉ‬ඹ‫ڦ‬ጲၿናೕ୲ժই‫ߌگ‬Ⴀথ‫ں‬ăُ
ྔLj‫ܔ‬ಖୟഗॲ঳ࢇ๑ᆩ‫ڹ‬ևথ‫ۥࢅ֫ں‬ևথ‫֫ں‬ă
ኄᄣፔ੗ᅜ৊ᅃօই‫ߌگ‬Ⴀথ‫ں‬ă๑ᆩ‫ࡗ߲ܠ‬੥ॽଇ
߲থ‫૶֫ں‬ሞᅃഐă
ኄၵ৥ၟೕ୲‫܈ޗڦ‬๟ዜ೺Ⴀ۶‫ڦۯ‬ዷᄲઠᇸă୳հഗ๼
‫ࢅ܋؜‬থ๭ഗ๼෇‫ڦా੻ټ‬ඪࢆሗො‫ࣷۼ‬ই‫گ‬ႠీLjই‫گ‬
‫܈ޗ‬ᇑሗො‫ׯ܈ޗ‬ኟԲăᅺُLj჋ۨDACዘࠓ୳հഗኮ
മLjᆌ֪ଉ୳հഗႠీLjᅜඓԍഄ஢ፁਏ༹ᆌᆩᄲ൱ă
൩ऻዿLjᆶၵ୳հഗยऺ෉ॲ‫ײ‬Ⴞփኧ‫෇े׼‬ഗॲࢅքਆ
֖ຕLjኄၵ‫ײ‬Ⴞኻఇె૙ၙ‫୳ڦ‬հഗೕ୲ၚᆌăํाೕ୲
ၚᆌॽߵ਍ഗॲࢅᆇຘ‫ۉ‬ୟӱ‫ํڦ‬ाߛೕ༬ႠܸՎࣅă
t
Ն௨୳հഗᇮॲኮक़੍‫ڥ‬໿ৎă୳հഗC)֖९཮7*๟
ഗॲ৆௢քਆ‫ڦ‬ଆࡻ‫ݔ‬૩ăഗॲքਆ৆௢้Ljጽ၍स
ิࢅࢻ᳘ࣷᆖၚ୳հഗ‫ڦ‬ೕ୲ၚᆌă
t
໯ᆩഗॲ‫ڦ‬ጲၿናೕ୲ࢅQᅺຕሁߛሁࡻă
t
ԍ‫׼‬ጽ၍‫ڦ‬ፆੇᇑ୳հഗ‫ڦ‬༬Ⴀፆੇ၎೅ದă໚඗ኄ
ᅃ‫ܔۅ‬ഗॲࢻ૶ժ‫ݥ‬዁࠲ዘᄲLj‫ܔڍ‬ᇀ૶዁୳հഗྔ
և‫ۉ‬ୟ‫ڦ‬ጽ၍)૩සLj๼෇ࢅ๼‫૶؜‬থ*ܸჾඐ࢔ዘ
ᄲă
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
AN05956-0-12/06(0)
Rev. 0 | Page 8 of 8
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