Controlling Noise and Radiation in Mixed-Signal and Digital System[NS講義]
NS 類比學院教材4 T2 z) h+ J2 Q" U
Agenda
; b: q; Q& K& [) [9 O) ^5 @1 ~) D( J• Signal Integrity and Line Termination
m* [4 r9 @0 b3 H" F5 R• Skin Effect
* s0 Y; _ W* L& Y' G; l& H3 n• Proximity Effect5 R3 E2 b3 D/ P/ T; z/ \
• “Ground” Resistance
) h. L+ _0 A" T G* W• Radiation1 j& O" o7 h+ S- z- a2 Z1 H3 }
• Noise in the “Ground” System
* ]) Z1 U% v- ~# ]1 \4 Y7 u6 A( t• The Split Ground Plane Problem* k, k) L% y& l' ~2 p6 Q
• Improved Layout
/ G0 }/ X' `* `6 y/ B, x" c: ]• Summary of Rules
' A9 \! e3 }% Y7 `# T• Recommended Reading: W- s; {% W: q' f( K; Z- }+ S/ N
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Signal Integrity Problem) p4 g0 N+ t. e# I
• Signals propagate down a line
9 S9 P4 k1 U) T( L6 Q/ F* N# X+ R- u• Improper termination causes reflections1 T" r& Y. R- s* p! W( r+ \/ p
• Reflections
( l3 E" z3 d e9 `3 y$ N9 `– Cause signal distortion) b( Q7 h* f/ ] g& [) u5 t
– Cause signal radiation
) |+ s: }, c! M( Y• Distortion( S& E- C( x2 ^- B) l3 J
– Leads to a change in timing/ k: K# q9 Q7 y% a
– Can lead to timing uncertainty (jitter)( \5 `4 K* l4 m! @7 @2 G8 ]) s
– Jitter causes ADC output noise
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) F/ @9 y8 W7 p9 R% g本帖隱藏的內容需要回復才可以瀏覽
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[ 本帖最後由 sjhor 於 2007-5-8 12:13 AM 編輯 ] |
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評分人數
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發表於 2007-5-8 12:08 AM
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發表於 2007-5-9 06:53 PM
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數位的雜訊 老是干擾 analog 電路5 J) `% A* K9 ]- |
真希望所有的 analog 都可以數位化
趕快下載下來看看; z) J4 `- }+ O& N q3 K/ i
