IEC TR 6301 7 Edition 1 0 201 5 1 2 TECHNICAL REPORT Flexible printed circuit boards (FPCBs) – Method of compensation of impedance variations IE C T R 6 3 0 1 7 2 0 1 5 1 2 (e n ) ® colour inside Inte[.]
I EC TR 6301 ® Ed i ti on 201 5-1 TECH N I CAL REPORT colour i n sid e Fl exi bl e pri n ted ci rcui t board s (FPCBs) – M eth od of com pen sati on of i m ped an ce I E C TR 6301 7: 01 5-1 2(en ) vari ati on s International Electrotechnical Commission International Electrotechnical Commission I E C TR 63 ® Ed i ti on 201 5-1 TE C H N I C AL RE PORT colour i n sid e Fl exi bl e pri n ted ci rcu i t board s (FP C B s ) – M eth od of com pen s ati on of i m ped an ce vari ati on s I N TERN ATI ON AL ELECTROTECH N I CAL COM MI SSI ON I CS 31 80 I SB N 978-2-8322-3083-1 Warn i n g ! M ake s u re th at you obtai n ed th i s pu bl i cati on from an au th ori zed d i stri bu tor ® Reg i stered trad emark of th e I n ternati on al El ectrotech ni cal Commi ssi on International Electrotechnical Commission – – I EC TR 6301 7: 201 © I EC 201 C O N TE N TS F O R E W O RD S cope N o rm a ti ve re fe re n ce s Ap p a tu s 5 T i m e d o m a i n re fl e cto m e try B l o ck d i a g m fo r i m p e d a n c e m e a s u ri n g Test s peci m en G e n e l S tru c tu re T e s t m e th o d 4 C a l c u l a ti o n Re p o rt An n e x A ( n o rm a ti ve ) B l o ck d i a g m fo r i m p e d a n ce m e a s u ri n g wi th T D R An n e x B ( i n fo rm a ti ve ) T h e o re ti c a l b a ckg ro u n d 1 An n e x C ( i n fo rm a ti ve ) E xa m p l e o f a n i m p e d a n ce m e a s u re m e n t wi th T D R An n e x D ( i n fo rm a ti ve ) H a n d co n ta c t e ffe ct An n e x E ( i n fo rm a ti ve ) T e s t re s u l t E Shi el d FPCB E Shi el d FPCB B i b l i o g p h y F i g u re – T D R te s t s ys te m F i g u re – T wo t yp e s o f i m p e d a n c e s tru ctu re o f F P C B F i g u re – S c h e m a ti c d i a g m o f a te s t s p e c i m e n F i g u re – I m p e d a n ce va l u e o f two t yp e F P C B ( b a re a n d s h i e l d ) F i g u re – C o m p e n s a ti o n va l u e ( ∆L) o f th e C u l i n e wi d th fo r th e s h i e l d F P C B F i g u re A – T D R te s t s ys te m a cc o rd i n g to I P C a - - F i g u re A – T D R te s t s ys te m a cc o rd i n g to Ag i l e n t T D R A F i g u re B – T wo t yp e s o f i m p e d a n c e s tru c tu re o f F P C B s 1 F i g u re B – C o m p a ri s o n o f th e i m p e d a n ce va l u e o f a b a re F P C B ve rs u s a s h i e l d FPCB 1 F i g u re C – P h o to g p h i c vi e w o f th e i m p e d a n c e m e a s u re m e n t wi th T D R F i g u re D – E ffe ct o f i m p e d a n c e va ri a ti o n b y h a n d c o n ta ct fo r b a re F P C B F i g u re E – M e a s u re m e n t re s u l t o f th e te s t s p e c i m e n fo r s h i e l d F P C B F i g u re E – M e a s u re m e n t re s u l t o f th e te s t s p e c i m e n fo r s h i e l d F P C B T a b l e E – C ro s s - s e c ti o n o f te s t s p e c i m e n wi th u s i n g s h i e l d F P C B T a b l e E – C ro s s - s e c ti o n o f te s t s p e c i m e n wi th u s i n g s h i e l d F P C B International Electrotechnical Commission I E C TR 301 7: 01 © I E C 201 – – I N TE RN ATI O N AL E L E C TRO TE C H N I C AL C O M M I S S I O N F L E XI B L E P RI N TE D C I RC U I T B O ARD S ( F P C B s ) – M E TH O D O F C O M P E N S ATI O N O F I M P E D AN C E VARI ATI O N S F O RE W O RD 1) T h e I n te rn a ti o n a l E l e ct ro t e ch n i c a l C o m m i s s i o n ( I E C ) i s a wo rl d wi d e o rg a n i z a ti o n fo r s t a n d a rd i z a t i o n co m p ri s i n g al l n a ti o n a l e l e c tro t e ch n i c a l co m m i t te e s (I E C N ati o n a l C o m m i tt e e s ) Th e o bj ect of I EC is to p ro m o te i n te rn a ti o n a l co - o p e t i o n o n a l l q u e s t i o n s co n ce rn i n g s ta n d a rd i za t i o n i n th e e l e ct ri c a l a n d e l e c tro n i c fi e l d s T o th i s e n d and T e ch n i c a l in a d d i ti o n Re p o rts , to o t h e r a cti vi ti e s , P u bl i cl y Ava i l a b l e I E C p u b l i s h e s I n te rn a ti o n a l S p e ci fi ca t i o n s (P AS ) an d S t a n d a rd s , G u i d es T e ch n i ca l ( h e re a ft e r S p e ci fi ca ti o n s , re fe rre d to as “I E C P u b l i ca ti o n ( s ) ” ) T h e i r p re p a t i o n i s e n t ru s t e d to te ch n i ca l c o m m i tte e s ; a n y I E C N a ti o n a l C o m m i tte e i n te re s t e d in th e s u bj ect d eal t wi t h m ay p a rt i ci p a t e in th i s p re p a t o ry wo rk I n t e rn a ti o n a l , g o ve rn m e n t a l an d n on - g o v e rn m e n t a l o rg a n i z a ti o n s l i a i s i n g wi th th e I E C a l s o p a rti ci p a te i n th i s p re p a t i o n I E C co l l a b o te s cl o s e l y wi t h th e I n te rn a t i o n a l O rg a n i z a ti o n fo r S t a n d a rd i z a ti o n (I S O) in a c co rd a n ce wi th d i ti on s d e t e rm i n e d by a g re e m e n t b e t we e n th e t wo o rg a n i za ti o n s 2) T h e fo rm a l d e c i s i o n s o r a g re e m e n ts o f I E C o n t e c h n i c a l m a t te rs e xp re s s , a s n e a rl y a s p o s s i b l e , a n i n t e rn a ti o n a l s en s u s of opi n i on on th e re l e va n t s u b j e c ts s i n ce e ach te ch n i c a l co m m i t te e h as re p re s e n t a t i o n fro m al l i n te re s te d I E C N a ti o n a l C o m m i t te e s 3) I E C P u b l i c a t i o n s h a ve th e fo rm o f re c o m m e n d a ti o n s fo r i n t e rn a ti o n a l u s e a n d a re a cc e p t e d b y I E C N a ti o n a l C o m m i tt e e s i n th a t s e n s e W h i l e a l l re a s o n a b l e e ffo rt s a re m a d e t o e n s u re th a t t h e t e ch n i ca l co n t e n t o f I E C P u b l i ca ti o n s is a cc u te , IEC can n ot be h el d re s p o n s i b l e fo r th e wa y in wh i c h th e y a re used or fo r an y m i s i n t e rp re t a t i o n b y a n y e n d u s e r 4) In o rd e r t o p ro m o te t n s p a re n t l y to th e i n te rn a t i o n a l m a xi m u m u n i fo rm i ty, e xt e n t I EC possi bl e in N a ti o n a l th e i r C o m m i tte e s n a ti on al an d u n d e rta ke re g i o n a l to appl y I E C p u bl i cati o n s P u b l i ca ti o n s An y d i v e rg e n c e b e t we e n a n y I E C P u b l i ca ti o n a n d t h e co rre s p o n d i n g n a ti o n a l o r re g i o n a l p u b l i c a t i o n s h a l l b e c l e a rl y i n d i ca te d i n t h e l a tt e r 5) I E C i t s e l f d o e s n o t p ro vi d e a n y a tt e s ta ti o n o f co n fo rm i ty I n d e p e n d e n t c e rti fi ca t i o n b o d i e s p ro vi d e c o n fo rm i t y a s s e s s m e n t s e rvi c e s a n d , i n s o m e a re a s , a cce s s t o I E C m a rks o f c o n fo rm i ty I E C i s n o t re s p o n s i b l e fo r a n y s e rvi c e s ca rri e d o u t b y i n d e p e n d e n t ce rt i fi c a t i o n b o d i e s 6) 7) Al l u s e rs s h o u l d e n s u re th a t t h e y h a ve t h e l a t e s t e d i ti o n o f th i s p u b l i ca ti o n N o l i a b i l i t y s h a l l a t t a ch to I E C o r i ts d i re c to rs , e m p l o y e e s , s e rva n t s o r a g e n ts i n cl u d i n g i n d i vi d u a l e xp e rts a n d m e m b e rs o f i t s t e c h n i ca l c o m m i tt e e s a n d I E C N a ti o n a l C o m m i t te e s fo r a n y p e rs o n a l i n j u ry, p ro p e rty d a m a g e o r oth e r d am ag e e xp e n s e s o f a n y n a tu re a ri s i n g ou t of th e wh a t s o e v e r, wh e th e r d i re ct o r i n d i re ct , p u b l i ca ti o n , u se o f, or re l i a n c e u pon, o r fo r c o s t s th i s I EC ( i n cl u d i n g P u b l i ca ti o n or l eg al fe e s ) and any o th e r I EC P u b l i ca t i o n s 8) Atte n ti o n i s d wn t o th e N o rm a t i ve re fe re n c e s ci t e d i n t h i s p u b l i c a t i o n U s e o f t h e re fe re n ce d p u b l i ca ti o n s i s i n d i s p e n s a b l e fo r th e co rre c t a p p l i ca ti o n o f th i s p u b l i c a t i o n 9) Atte n ti o n i s d wn t o th e p o s s i b i l i t y th a t s o m e o f th e e l e m e n ts o f th i s I E C P u b l i ca t i o n m a y b e th e s u b j e ct o f p a te n t ri g h t s I E C s h a l l n o t b e h e l d re s p o n s i b l e fo r i d e n ti fyi n g a n y o r a l l s u ch p a t e n t ri g h t s T h e m a i n ta s k o f I E C te ch n i ca l co m m i tte e s i s to p re p a re I n te rn a ti o n a l S ta n d a rd s H o we ve r, a te c h n i c a l co m m i tte e m a y p ro p o s e th e p u b l i c a ti o n o f a te c h n i ca l re p o rt wh e n i t h a s co l l e cte d d a ta o f a d i ffe re n t ki n d fro m th a t wh i ch i s n o rm a l l y p u b l i s h e d a s a n I n te rn a ti o n a l S ta n d a rd , fo r e xa m p l e " s ta te o f th e a rt" I E C T R , wh i c h i s a te c h n i c a l re p o rt, h a s b e e n p re p a re d b y I E C te ch n i c a l co m m i tte e : E l e c tro n i cs a s s e m b l y te c h n o l o g y T h e te x t o f th i s te ch n i ca l re p o rt i s b a s e d o n th e fo l l o wi n g d o cu m e n ts : E n q u i ry d ft Re p o rt o n vo t i n g /1 / D T R /1 / RVC F u l l i n fo rm a ti o n o n th e vo ti n g fo r th e a p p ro va l o f th i s te c h n i ca l re p o rt ca n b e fo u n d i n th e re p o rt o n vo ti n g i n d i c a te d i n th e a b o ve ta b l e T h i s p u b l i c a ti o n h a s b e e n d fte d i n a cc o rd a n c e wi th th e I S O /I E C D i re cti ve s , P a rt International Electrotechnical Commission – – I EC TR 6301 7: 201 © I EC 201 T h e c o m m i tte e h a s d e c i d e d th a t th e c o n te n ts o f th i s p u b l i c a ti o n wi l l re m a i n u n c h a n g e d u n ti l th e s ta b i l i t y d a te i n d i ca te d on th e I EC we b s i te u n d er " h ttp : //we b s to re i e c c h " in th e d a ta re l a te d to th e s p e c i fi c p u b l i c a ti o n At th i s d a te , th e p u b l i c a ti o n wi l l b e • re co n fi rm e d , • wi th d wn , • re p l a c e d b y a re vi s e d e d i ti o n , o r • am en d ed A b i l i n g u a l ve rs i o n o f th i s p u b l i ca ti o n m a y b e i s s u e d a t a l a te r d a te I M P O RT AN T th a t it – Th e tai n s u n d e rs t a n d i n g c o l o u r p ri n t e r International Electrotechnical Commission of ' col o u r i n s i d e ' c o l o u rs i ts wh i c h c o n te n ts l og o a re U s e rs on th e cove r p ag e c o n s i d e re d s h ou l d to t h e re fo re o f th i s be p u b l i c a ti o n u s e fu l p ri n t th i s fo r i n d i c a te s th e d o cu m en t c o rre c t u si n g a I E C TR 301 7: 01 © I E C 201 – – F L E XI B L E P RI N TE D C I RC U I T B O ARD S ( F P C B s ) – M E TH O D O F C O M P E N S ATI O N O F I M P E D AN C E VARI ATI O N S Th i s S co p e T e ch n i ca l Re p o rt s p e c i fi e s a co m p e n s a ti o n m e th o d of Cu l i n e wi d th a cco rd i n g to i m p e a d a n ce re d u c ti o n b y u s i n g n o i s e s u p p re s s i o n m a te ri a l s ( h e re a fte r re fe rre d to a s N S M s ) fo r F P C B s T h i s T e ch n i c a l Re p o rt p re s e n ts a n o p ti m u m re s u l t fo r m a i n ta i n i n g a d e s i g n a te d p e rfo rm a n c e o f F P C B s b y u s i n g N S M s I t a l s o i n d i c a te s a m e a s u ri n g m e th o d fo r a n i m p e d a n ce va ri a ti o n o f F P C B s u s i n g N S M s wi th th e p re va i l i n g T D R ( ti m e d o m a i n re fl e c to m e try) m e th o d T h i s m e th o d i s re s ti cte d va ri a ti o n of to m e a s u ri n g th e Cu o n l y th e va ri a ti o n l i n e wi d th by using of an N SMs i m p e d a n c e va l u e i n fo r FPCBs Th i s a cco rd a n c e wi th re p o rt, h o we ve r, th e n e i th e r d e te rm i n e s n o r i n d i c a te s th e s tru ctu re o r m a te ri a l o f F P C B s N o rm a ti ve re fe re n ce s T h e fo l l o wi n g d o c u m e n ts , i n wh o l e o r i n p a rt, a re n o rm a ti ve l y re fe re n ce d i n th i s d o c u m e n t a n d a re i n d i s p e n s a b l e fo r i ts a p p l i ca ti o n F o r d a te d re fe re n ce s , o n l y th e e d i ti o n c i te d a p p l i e s F o r u n d a te d re fe re n ce s , th e l a te s t e d i ti o n of th e re fe re n ce d d ocu m en t ( i n cl u d i n g an y a m e n d m e n ts ) a p p l i e s I PC 21 41 A Design Guide for High -Speed Controlled Im pedance Circuits Boards h ttp : //www i p c o rg / 3 Ap p a tu s T i m e d o m a i n re fl e cto m e t ry T i m e d o m a i n re fl e cto m e try ( h e re a fte r re fe rre d to a s T D R ) i s u ti l i ze d to i d e n ti fy th e i m p e d a n c e d a ta a t th e s p e c i fi c fre q u e n c y n g e o f F P C B s B l o c k d i a g m fo r i m p e d a n c e m e a s u ri n g F i g u re g i ve s o n e e xa m p l e o f a T D R s e tu p IEC F i g u re – T D R t e s t s ys te m International Electrotechnical Commission – – N O TE I EC TR 6301 7: 201 © I EC 201 A g u i d e l i n e fo r T D R i s p ro vi d e d i n An n e x A Te s t s p e ci m e n G e n e l FPCBs u si n g NSMs sh ou l d re d u c e th e e ffe ct of e l e ctro - m a g n e ti c i n te rfe re n ce H o we ve r, wi th o u t a p p ro p ri a te a p p l i ca ti o n o f N S M s , i t m a y c a u s e p o o r s i g n a l q u a l i t y o n th e F P C B d u e to th e i m p e d a n c e va ri a ti o n o f C u c i rc u i t l i n e s A m a j o r fa c to r o f i m p e d a n ce va ri a ti o n u s i n g N S M s i s d u e to th e s tru c tu re va ri a ti o n o f F P C B s , a s s h o wn i n F i g u re Vi a C o ve r l a ye r h ol e NSMs C o ve r PI S (Cu ) G (Cu ) S(Cu ) G (C u ) PI PI GND GND B a re (Cu ) IEC FP CB – < M i c ro s t ri p l i n e NSM s N O TE PI Ad h e s i ve Ad h e s i ve G (Cu ) F i g u re a l a ye r Sh i el d s t ru c t u re w i t h o u t < S t ri p F i g u re b – > G (Cu ) (Cu ) FP CB IEC l i n e s t ru c t u re w i t h NSM s > A g u i d e l i n e fo r t h e th e o re ti c a l b a c kg ro u n d o f i m p e d a n c e va ri a t i o n i s p ro vi d e d i n An n e x B F i g u re – T w o t y p e s o f i m p e d a n c e s t ru c t u re o f F P C B S t ru c t u re T e s t s p e c i m e n s s h a l l b e d e s i g n e d b y two s tru ctu re s , i e wi th a n d wi th o u t u s i n g N S M s i n o n e F P C B b o a rd T e s t s p e c i m e n s s h a l l b e d i vi d e d i n to two h a l ve s wi th o n e b o a rd ( c o n s i s ti n g o f th e two p a rts o f o n e b a re F P C B a n d o n e s h i e l d F P C B ) fo r e q u i ta b l e e s ti m a ti o n T h i s s tru c tu re h as th e m e ri t o f u n i fo rm l y m e a s u ri n g at on ce a b a re and a sh i eld F PCB u n d e r th e sam e co n d i ti o n O n e F P C B wi th o u t u s i n g N S M s h a s a s tru c tu re o f a m i cro - s tri p l i n e T h i s t yp e i s ca l l e d b a re F P C B An o th e r F P C B u s i n g NSMs h as a s tru ctu re o f a s tri p l i n e T h i s t yp e i s ca l l e d s h i e l d F P C B ( s e e F i g u re ) A C u l i n e i s fo rm e d wi th a l i n e a r d i s ta n ce d i re c ti o n , b e c a u s e th e va ri a ti o n o f th e s h i e l d e ffe ct i s ve ry we a k fo r a c u rve d l i n e G e n e l l y, th e n u m b e r o f C u p a tte rn s o f th e te s t s p e c i m e n c a n b e o ve r th e ( fo r e xa m p l e LW ~ LW ) fo r ve ri fi c a ti o n o f th e ch a cte ri s ti c i m p e d a n c e ( Z th e C u l i n e s h a l l va ry i n a cco rd a n c e wi th th e s u p p l i e r’ s a cti vi t y International Electrotechnical Commission ) B u t th e n u m b e r a n d wi d th o f I E C TR 301 7: 01 © I E C 201 – – Vi a h ol e LW LW B a re FP CB LW ● ● ● ● ● ● ● ● ● ● ● ● LW n LW LW S h i el d LW ● LW n ● ● ● ● ● ● ● ● > ● ● FP CB ● ㎝ IEC F i g u re – S c h e m a t i c d i a g m of a te s t s p e ci m en S i ze , s p a c i n g a n d n u m b e r o f vi a h o l e s fo r te s t s p e c i m e n s s h a l l n o t b e l i m i te d , b u t s u ffi ci e n tl y re p re s e n te d E s p e c i a l l y, vi a h o l e s o ffe r a n i m p o rta n t ro l e to c o n ta ct th e N S M s wi th th e g ro u n d p l a n o f s h i e l d F P C B T h e n u m b e r o f vi a h o l e s s h a l l b e a s a g re e d b e twe e n u s e r a n d s u p p l i e r ( h e re a fte r re fe rre d to a s AAB U S ) T h e l e n g th o f th e te s t s p e c i m e n s h a l l b e o ve r c m i n o rd e r to o b ta i n s ta b l e va l u e s fro m th e m e a s u ri n g e q u i p m e n t E a ch e n d o f th e te s t s p e c i m e n s h o u l d co n s i s t o f S M A ( s u b m i n i a tu re A) − co n n e cto rs F o r d i s c e rn m e n t o f a C u l i n e - wi d th , wri te e a ch n u m b e r to th e b a re − e n d o f th e te s t s p e ci m e n n e a r th e S M A c o n n e cto r T h e d e c i s i o n o f wi d th a n d th i ckn e s s o f a te s t s p e c i m e n s h a l l d e p e n d o n to th e p i tc h o r th e n u m b e r o f th e C u l i n e o r a cc o rd i n g to th e re q u i re m e n ts o f th e u s e r H o we ve r, g e n e l l y th e s tru c tu re o f th e te s t c o u p o n s h a l l b e AAB U S An i m p e d a n ce va l u e fo r F P C B s s h a l l b e ch a n g e d wi th re s p e c t to th e C u p a tte rn wi d th , l a ye r s tru c tu re , re q u i re d th i ckn e s s d epen d i n g spe ci m e n s is n ot and on m a te ri a l s th e u s e r’ s i m p o rta n t, Th e s tru ctu re sam pl e beca u se th e and m a te ri a l s s p e c i fi c a ti o n s u ser of F PCBs But shall of th e th e te s t va ri a ti o n c h e ck s p eci m en s of o n l y th e th e s e is te s t i m p e d a n ce va ri a ti o n e ffe ct b y u s i n g N S M s fo r th e u s e r’ s s a m p l e s p e c i fi c a ti o n In Test m eth od o rd e r to m e a s u re th e p ro p e r p ro c e d u re s s h a l l b e e m p o ye d International Electrotechnical Commission i m pe d an ce va l u e fo r th e te s t s p e ci m e n , th e fo l l o wi n g – – a) I m p e d a n ce va l u e s of th e te s t s peci m en I EC TR 6301 7: 201 © I EC 201 shall be m e a s u re d by e m p l o yi n g T D R, te s t s p e c i m e n a n d c o a x i a l ca b l e a cc o rd i n g to I P C A b) M e a s u re m e n t c o n d i ti o n s s h a l l b e s e t b y m e a n s o f th e T D R, s u c h a s d i e l e ctri c co n s ta n t, m e a s u re m e n t p o i n t, ri s i n g ti m e , p u l s e wi d th , e tc c) T h e i m p e d a n c e va l u e o f th e te s t s p e c i m e n s h a l l b e m e a s u re d a cc o rd i n g to th e C u line wi d th fo r b a re F P C B d) T h e m e a s u re m e n t o f th e a b o ve p ro ce s s a cc o rd i n g to C u l i n e wi d th s h a l l b e re p e a te d fo r th e s h i e l d F P C B ( s e e F i g u re ) N OTE e) T h e g u i d e l i n e o f t h e te s t m e th o d i s p ro vi d e d i n An n e x C T h e m e a s u ri n g va l u e o f th e two t yp e s F P C B s ( b a re a n d s h i e l d ) s h a l l b e p re s e n te d i n fo rm o f a d i a g m ( l i n e c h a rt u s i n g e xc e l ) 70 60 I m ped an ce ( Ω) 50 40 Bare 30 Sh iel d 20 10 0 20 30 40 50 Li n e wi d th 60 70 80 µ ( m) IEC F i g u re – I m p e d a n c e v a l u e o f two t yp e F P C B ( b a re a n d s h i e l d ) f) In o rd e r to o b ta i n th e c o rre ct d a ta , a d i re ct h and co n ta c t to th e s pe ci m en sh ou l d be a vo i d e d a s th e e l e c tro s ta ti c c a p a c i t y va ri e s N O TE 4 T h e e ffe c t o f h a n d c o n t a c t wi t h th e te s t s p e c i m e n i s p ro vi d e d i n An n e x D C a l c u l a ti o n T h e fo l l o wi n g a p p l i e s to th e c a l c u l a ti o n o f th e co m p e n s a ti o n va l u e s a) G e n e l l y, a d e m a n d o f th e c h a c te ri s ti c i m p e d a n c e va l u e ( l in e, 00 b) Ω fo r a d i ffe re n ti a l C u l i n e is 50 Ω fo r a s i n g l e C u I n th e ca s e o f a s i n g l e C u l i n e , d w a s tra i g h t b a s e l i n e c o rre s p o n d i n g to a c h a cte ri s ti c i m p e d a n c e va l u e ( c) Z0 ) Ω ) o n a e xce l ch a rt ( s e e F i g u re ) F i n d a cro s s p o i n t o f th e C u l i n e wi d th fo r a c h a cte ri s ti c i m p e d a n ce va l u e ( Ω) wi th e a c h cu rve o f b a re a n d s h i e l d F P C B d) E s p e c i a l l y, ch e ck th e C u l i n e wi d th i n th e p o i n t to m e e t th e Ω i m p e d a n ce va l u e fro m th e s h i e l d F P C B cu rve ∆L) e) C a l c u l a te a d i ffe re n ce ( f) Re d u ce g) S h o w th i s va l u e i n a n e w d e s i g n o f a C u l i n e wi d th fo r th e b a re F P C B N O TE International Electrotechnical Commission ∆L o f th e C u l i n e wi d th b e twe e n two p o i n ts b y d e g re e s to th e C u l i n e wi d th o f th e b a re F P C B A d e ta i l e d t e s t re s u l t i s p ro vi d e d i n An n e x E I m pe d a n ce ( Ω) I E C TR 301 7: 01 © I E C 201 – – 50 B a re ∆L Shi el d L i n e wi d t h ( F i g u re – C o m p e n s a t i o n va l u e ( In ∆L ) µm ) IEC o f th e C u l i n e wi d t h fo r th e s h i e l d F P C B Re p o rt case th a t th e s p e c i fi ca ti o n of th e m e a s u re m e n t is c o n ta i n e d in th e re p o rt, it sh al l be p ro vi d e d wi th th e d e ta i l s a s s p e ci fi e d b e l o w a) T yp e o f T D R e q u i p m e n t b) T yp e o f s h i e d m a te ri a l s ( s tru c tu re , th i ckn e s s , m a ke r) c) T yp e o f b a s e m a te ri a l s ( s tru c tu re , m a ke r) d) T h e n g e o f C u l i n e wi d th e) T h e n g e o f i m p e d a n c e ( f) I m p e d a n ce va l u e d a ta a c co rd i n g to th e C u l i n e wi d th International Electrotechnical Commission Z) va ri a ti o n a cco rd i n g to th e C u l i n e wi d th o f th e te s t s p e c i m e n – 10 – I EC TR 6301 7: 201 © I EC 201 An n e x A ( n o rm a ti ve ) B l o ck d i a g m fo r i m p e d a n ce m e a s u ri n g wi th TD R T i m e D o m a i n Re fl e cto m e try ( T D R) s h a l l b e u s e d fo r i m p e d a n c e m e a s u re m e n ts a cco rd i n g to I P C A T h e T D R s e tu p ( I P C A) i s p re s e n te d i n F i g u re A IEC F i g u re A – T D R te s t s ys te m a c co rd i n g to I P C 41 a -9 -1 T e s t s e tu p b y Ag i l e n t T D R A i s p re s e n te d i n F i g u re A IEC F i g u re A – T D R t e s t s ys te m a c co rd i n g to Ag i l e n t T D R 47 A Ag i l e n t T D R A i s t h e t d e n a m e o f a p ro d u c t s u p p l i e d b y Ag i l e n t T e c h n o l o g i e s T h i s i n fo rm a ti o n i s g i v e n fo r t h e c o n ve n i e n c e o f u s e rs o f th i s d o c u m e n t a n d d o e s n o t c o n s t i t u t e a n e n d o rs e m e n t b y I E C o f th e p ro d u c t n a m e d E q u i v a l e n t p ro d u c ts m a y b e u s e d i f th e y c a n b e s h o wn t o l e a d t o th e s a m e re s u l ts International Electrotechnical Commission I E C TR 301 7: 01 © I E C 201 – 11 – An n e x B ( i n fo rm a ti ve ) T h e o re ti c a l b a c k g ro u n d T h e a p p l i ca ti o n o f s h i e l d F P C B ( wi th u s i n g N S M s ) i n e l e c tro n i c d e vi c e s ( o r e q u i p m e n t) s h a l l b e a b l e to re d u ce th e e ffe ct o f e l e c tro - m a g n e ti c i n te rfe re n c e , b u t i t wi l l e ve n tu a l l y re s u l t i n b a d s i g n a l q u a l i t y o f F P C B s , b e c a u s e o f th e i m p e d a n c e va ri a ti o n o f C u c i rc u i t l i n e s T h e p u rp o s e o f th i s T e c h n i c a l R e p o rt i s to s e ttl e th e p ro b l e m th a t F P C B s u s i n g N S M s s u ffe r fro m , i e to e l i m i n a te a n i m p e d a n c e m i s m a tch b y m e a n s o f i m p e d a n c e c o m p e n s a ti o n A m aj or fa cto r cau s i n g th e i m p e d a n ce va ri a ti o n by u sing N SMs is due to th e s tru c tu re va ri a ti o n o f F P C B s a s s h o wn i n F i g u re B Vi a C o ve r l a ye r h ol e NSS C o ve r PI S (Cu ) S(Cu ) G (Cu ) G (Cu ) B a re < M i c ro G (Cu ) PI PI GND a – PI Ad h e s i ve Ad h e s i ve G (Cu ) F i g u re B l a ye r GND (Cu ) IEC FP CB s t ri p l i n e s t ru c t u re F i g u re B Shi el d > F i g u re B b – < S t ri p (C u ) FP CB l i n e s tru c tu re IEC > – T w o t y p e s o f i m p e d a n c e s t ru c t u re o f F P C B s T h e i m p e d a n c e va l u e o f th e s tri p l i n e s tru c tu re fo r F P C B s i s l o we r th a n th a t o f th e m i cro - s tri p l i n e s tru ctu re , a s s h o wn i n F i g u re B N S M s s h a l l p l a y a ro l e wi th re s p e c t o f th e m e ta l l a ye r, b e c a u s e th e y a re co m p o s e d o f a m e ta l co m p o n e n t Acco rd i n g l y, th e m i cro - s tri p l i n e s tru c tu re fo r b a re F P C B s s h a l l b e ch a n g e d to th e s tri p l i n e s tru c tu re a fte r a p p l i c a ti o n o f N S M s fo r b a re FPCB T h e i m p e d a n c e va l u e d e cre a s e s , a s th e C u l i n e wi d th i n cre a s e s Ω) B a re I m p e d a n ce ( Sh i el d Li n e wi d t h F i g u re B – C o m p a ri s o n ( µm ) IEC o f th e i m p e d an ce va l u e o f a b a re F P C B v e rs u s a sh ield FPCB F P C B s u p p l i e rs h a ve to p ro d u c e a n e w re d u cti o n d e s i g n o f C u l i n e wi d th fo r n e w i m p e d a n ce m a tch i n g ( International Electrotechnical Commission Z , 50 Ω) – 12 – I EC TR 6301 7: 201 © I EC 201 An n e x C ( i n fo rm a ti ve ) E xa m p l e o f a n i m p e d a n c e m e a s u re m e n t w i th T D R T h e te s t s p e c i m e n s h o ws two d i ffe re n t i m p e d a n c e va l u e s a cco rd i n g to th e s tru ctu re va ri a ti o n b e twe e n a b a re F P C B a n d a s h i e l d F P C B , a s d e p i cte d i n F i g u re C E xa m p l e : te s t s p e ci m e n : cm ( b a re ) +8 cm ( s h i e l d ) , 0 µm C u l i n e wi d th , wi th th e fo l l o wi n g va l u e s : Ω; 31 , Ω; • i m p e d a n c e va l u e wi th b a re F P C B : , • i m p e d a n c e va l u e wi th s h i e l d F P C B : • th e i m p e d a n c e d i ffe re n c e b e twe e n two t yp e s : ∆Z (1 9, Ω) IEC F i g u re C F i g u re C International Electrotechnical Commission a – < B a re F P C B > IEC F i g u re C b – < S h i el d FPCB – P h o t o g p h i c v i e w o f t h e i m p e d a n c e m e a s u re m e n t w i t h > TDR I E C TR 301 7: 01 © I E C 201 – 13 – An n e x D ( i n fo rm a ti ve ) H a n d c o n ta c t e ffe c t T h e i m p e d a n c e va l u e fo r a s h i e l d F P C B i s n o t i n fl u e n c e d b y h a n d c o n ta ct B u t th e i m p e d a n ce va l u e fo r a b a re F P C B i s a b l e to va ry d u e to h a n d co n ta ct , a s s h o wn i n F i g u re D E s p e ci a l l y, th e e ffe ct o f h a n d co n ta c t i s m o re i n cre a s e d b y a s m a l l l i n e wi d th 64 I m p e d a n ce ( Ω) 62 60 B a re n o h a n d 58 56 B a re h a n d 54 52 50 35 40 45 50 L i n e wi d t h ( F i g u re D International Electrotechnical Commission 55 60 65 µm ) – E ffe c t o f i m p e d a n c e v a ri a t i o n IEC b y h an d c o n t a c t fo r b a re F P C B – 14 – I EC TR 6301 7: 201 © I EC 201 An n e x E ( i n fo rm a ti ve ) Te s t re s u l t E Sh i el d FPC B F i g u re E +8 s h o ws th e re s u l t o f a te s t s p e c i m e n th a t u s e s a n cm l e n g th s h i e l d ( cm ( b a re ) cm ( s h i e l d ) ) T o s a ti s fy th e Th e 30 n g e µm ~ 50 of µm Ω c o n d i ti o n fo r s h i e l d F P C B , th e C u l i n e wi d th s h a l l b e n e a r i m p e d a n ce ( Z) re d u c ti o n wi th NSMs: 16 Ω ~ 30 Ω ( wi th i n µm th e n g e of C u l i n e wi d th ) • N e e d o f a re d u c ti o n o f th e l i n e wi d th fo r n e w i m p e d a n c e m a tc h i n g ( • ( e xa m p l e ) B a re F P C B ( 0 µm ) ⇒ Sh i el d FPCB (40 µm ) : 60 µm Z0 , Ω) 50 wi d e d i ffe re n c e ( ∆L) B a re I m pe d a n ce ( Ω) Sh i el d ∆L L i n e wi d t h ( µm ) cm IEC F i g u re E – M e a s u re m e n t re s u l t o f th e te s t s p e c i m e n fo r s h i e l d F P C B A cro s s - s e cti o n o f a te s t s p e ci m e n u s i n g s h i e l d C u th i ckn e s s o f N S M s fo r s h i e l d F P C B i s F P C B i s a s s h o wn i n T a b l e E W h e re , a µm T a b l e E – C ro s s -s e cti o n o f t e s t s p e c i m e n wi t h u s i n g s h i e l d F P C B FCCL PI 50 ( F l e xi b l e C o p p e r C l a d L a m i n a t e ) FPCB C u th i c kn e s s C/ L P a tt e rn s p a c e 24 µm PI µm , µm , µm ) Ad h e s i ve 200 M a te ri a l International Electrotechnical Commission µm (C u p l ati n g µm Cu NSM s Th i c kn e s s Cu 2 µm µm I E C TR 301 7: 01 © I E C 201 E – 15 – Sh i el d FPCB F i g u re E s h o ws th e re s u l t o f te s t s p e c i m e n wi th using cm l e n g th (8 cm +8 ( b a re ) cm (sh i el d 2)) T o s a ti s fy th e Th e 30 n g e µm of ~ 50 Ω c o n d i ti o n fo r s h i e l d i m p e d a n ce µm ( Z) µm F P C B , C u l i n e wi d th s h a l l b e n e a rb y re d u c ti o n wi th NSMs: 13 Ω Ω ~ 24 ( wi th i n th e n g e of C u l i n e wi d th ) • N e e d o f a re d u c ti o n o f th e l i n e wi d th fo r n e w i m p e d a n c e m a tc h i n g ( • ( e xa m p l e ) B a re F P C B ( 0 µm ) ⇒ Sh i el d FPCB (50 µm ) : 50 µm Z0 , 50 Ω) wi d e d i ffe re n c e ( ∆L) B a re I m pe d a n ce ( Ω) Sh i el d ∆L L i n e wi d t h ( µm ) cm IEC F i g u re E – M e a s u re m e n t re s u l t o f th e t e s t s p e c i m e n fo r s h i e l d F P C B A cro s s - s e c ti o n o f a te s t s p e c i m e n wi th using sh ield F P C B i s a s i n d i ca te d W h e re , a C u ( o r Ag ) th i ckn e s s o f N S M s fo r s h i e l d F P C B i s , in Tabl e E µm T a b l e E – C ro s s -s e cti o n o f te s t s p e c i m e n wi th u s i n g s h i e l d F P C B FCCL C u th i c kn e s s FPCB C/ L P a tt e rn s p a c e m a te ri a l PI 50 24 µm PI µm , International Electrotechnical Commission µm (C u pl ati n g µm , µm a d h e s i ve 200 µm C u ( o r Ag ) NSM s th i c kn e s s Cu 0, µm ) µm – – IEC TR 6301 7: 201 © I EC 201 B i b l i o g p h y Noise suppression sheet for digital devices and equipment – Part : Definitions and general properties IEC 62333-1 : 2006, _ International Electrotechnical Commission International Electrotechnical Commission INTERNATIONAL ELECTROTECHNICAL COMMISSION 3, rue de Varembé PO Box 31 CH-1 21 Geneva 20 Switzerland Tel: + 41 22 91 02 1 Fax: + 41 22 91 03 00 info@iec.ch www.iec.ch International Electrotechnical Commission