|
PCB板中干擾的存在
在實際研究中發(fā)現，PCB板的設計主要有四方面的干擾存在：電源噪聲、傳輸線干擾、耦合和電磁干擾（EMI）。
1電源噪聲
高頻電路中，電源所帶有的噪聲對高頻信號影響尤為明顯。因此，首先要求電源是低噪聲的。在這里，干凈的地和干凈的電源同樣重要。
電源特性
2傳輸線
在PCB中只可能出現兩種傳輸線：帶狀線和微波線，傳輸線的問題就是反射，反射會引發(fā)出很多問題，例如負載信號將是原信號與回波信號的疊加，增加信號分析的難度；反射會引起回波損耗（回損），其對信號產生的影響與加性噪聲干擾產生的影響同樣嚴重。
3耦合
干擾源產生的干擾信號是通過一定的耦合通道對電控系統(tǒng)發(fā)生電磁干擾作用的。
干擾的耦合方式無非是通過導線、空間、公共線等作用在電控系統(tǒng)上。分析下來主要有以下幾種：直接耦合、公共阻抗耦合、電容耦合、電磁感應耦合、輻射耦合等。
公共阻抗耦合
4電磁干擾（EMI）
電磁干擾EMI有傳導干擾和輻射干擾兩種。傳導干擾是指通過導電介質把一個電網絡上的信號耦合（干擾）到另一個電網絡。
輻射干擾是指干擾源通過空間把其信號耦合（干擾）到另一個電網絡。
在高速PCB及系統(tǒng)設計中，高頻信號線、集成電路的引腳、各類接插件等都可能成為具有天線特性的輻射干擾源，能發(fā)射電磁波并影響其他系統(tǒng)或本系統(tǒng)內其他子系統(tǒng)的正常工作。
PCB及電路抗干擾措施
印制電路板的抗干擾設計與具體電路有著密切的關系，接下來，我們僅就PCB抗干擾設計的幾項常用措施做一些說明。
TCCX1730LW 1746-P1
1746-P2
1746-P3
1746-P4
1746-A10
1746-A13
1746-A4
1746-A7
1746-C16
1746-C7
1746-C9
1746-IA16
1746-IA4
1746-IA8
1746-IB16
1746-IB32
1746-IB8
1746-IC16
1746-IG16
1746-IH16
1746-IM16
1746-IM4
1746-IM8
1746-IN16
1746-IO12
1746-IO12DC
1746-IO4
1746-IO8
1746-ITB16
1746-ITV16
1746-IV16
1746-IV32
1746-IV8
1746-OA16
TCCX1730LW
Siemens / ITE HHFD63F250 - New Style, New in Box!
Siemens / ITE HFXD63B225 - New Style, New in Box!
Siemens / ITE HFD63F250 - New Style, New in Box!
Siemens / ITE HF367 - New Style, New in Box!
Siemens / ITE HF366NR - New Style, New in Box!
Siemens / ITE HF366 - New Style, New in Box!
Siemens / ITE HF365NR - New Style, New in Box!
Siemens / ITE HF365 - New Style, New in Box!
Siemens / ITE GF326NR - New Style, New in Box!
Siemens / ITE GF326N - New Style, New in Box!
Siemens / ITE GF325NR - New Style, New in Box!
Siemens / ITE GF325N - New Style, New in Box!
Siemens / ITE FXD63L150L - New Style, New in Box!
Siemens / ITE FXD63H150L - New Style, New in Box!
Siemens / ITE FXD63B250L - New Style, New in Box!
Siemens / ITE FXD63A250 - New Style, New in Box!
Siemens / ITE CND63B120 - New Style, New in Box!
Siemens / ITE CND63B100 - New Style, New in Box!
Siemens / ITE CLD63B600 - New Style, New in Box!
Siemens / ITE CLD63B500 - New Style, New in Box!
Siemens / ITE CJD63B400 - New Style, New in Box!
Siemens / ITE CJD63B350 - New Style, New in Box!
Siemens / ITE CJD63B300 - New Style, New in Box!
Siemens / ITE CJD63B250 - New Style, New in Box!
Siemens / ITE CFD63B250L - New Style, New in Box!
Siemens / ITE CFD63B225L - New Style, New in Box!
Siemens / ITE CFD63B200L - New Style, New in Box!
Siemens / ITE CFD63B150L - New Style, New in Box!
Siemens / ITE CFD63B125L - New Style, New in Box!
Siemens / ITE CFD63B100L - New Style, New in Box!
Siemens / ITE CFD63A250 - New Style, New in Box!
Siemens / ITE CED63B125L - New Style, New in Box!
GE TKMA836800WL - New Style, New in Box!
GE TKMA836700WL - New Style, New in Box!
GE TKMA836600WL - New Style, New in Box!
GE TKMA836500WL - New Style, New in Box!
GE TKMA836450WL - New Style, New in Box!
GE TKMA836400WL - New Style, New in Box!
GE TKMA836300WL - New Style, New in Box!
GE TKMA3T1200 - New Style, New in Box!
GE TKMA31200WL - New Style, New in Box!
GE TKMA31000WL - New Style, New in Box!
GE TJK636600WL - New Style, New in Box!
GE TJK636500WL - New Style, New in Box!
GE TJK636450WL - New Style, New in Box!
GE TJK636350WL - New Style, New in Box!
GE TJK636300WL - New Style, New in Box!
GE TJK636250WL - New Style, New in Box!
GE TJC36600G - New Style, New in Box!
GE TJC36400G - New Style, New in Box!
GE TJC36400F - New Style, New in Box!
GE TJC36400E - New Style, New in Box!
GE TJC36400B - New Style, New in Box!
GE THKMA836800WL - New Style, New in Box!
GE THKMA836700WL - New Style, New in Box!
GE THKMA836500WL - New Style, New in Box!
GE THKMA836400WL - New Style, New in Box!
GE THJK636F000 - New Style, New in Box!
GE THJK636600WL - New Style, New in Box!
GE THJK436400WL - New Style, New in Box!
GE THJK436350WL - New Style, New in Box!
GE THJK436300WL - New Style, New in Box!
GE SKPA36AT1200 - New Style, New in Box!
GE SKPA36AT0800 - New Style, New in Box!
GE SKLA36AT1200 - New Style, New in Box!
GE SKLA36AT0800 - New Style, New in Box!
GE SKLA36AI0800 - New Style, New in Box!
GE SKHA36AT1200 - New Style, New in Box!
GE SKHA36AT0800 - New Style, New in Box!
GE SGPA36AT0600 - New Style, New in Box!
GE SGPA36AT0400 - New Style, New in Box!
GE SGLA36AT0600 - New Style, New in Box!
GE SGLA36AT0400 - New Style, New in Box!
GE SGLA36AI0600 - New Style, New in Box!
GE SGHA36AT0600 - New Style, New in Box!
GE SFPA36AT0250 - New Style, New in Box!
GE CR306G104 - New Style, New in Box!
GE CR306G102 - New Style, New in Box!
GE CR306G004 - New Style, New in Box!
GE CR306G002 - New Style, New in Box!
GE CR306F602 - New Style, New in Box!
GE CR306F104 - New Style, New in Box!
GE CR306F103 - New Style, New in Box!
GE CR306F102 - New Style, New in Box!
GE CR306F004 - New Style, New in Box!
GE CR306F003 - New Style, New in Box!
GE CR306F002 - New Style, New in Box!
GE CR305G002 - New Style, New in Box!
GE CR305F004 - New Style, New in Box!
GE CR305F002 - New Style, New in Box!
Cutler-Hammer W200M6CFC - New Style, New in Box!
Cutler-Hammer W200M3CFC - New Style, New in Box!
Cutler-Hammer AN16SN0CB - New Style, New in Box!
Cutler-Hammer AN16SN0CB - New Style, New in Box!
Cutler-Hammer AN16SN0BB - New Style, New in Box!
Cutler-Hammer AN16SN0BB - New Style, New in Box!
Cutler-Hammer AN16SN0AB - New Style, New in Box!
Cutler-Hammer AN16SN0AB - New Style, New in Box!
Cutler-Hammer AN16NN0C - New Style, New in Box!
Cutler-Hammer AN16NN0C - New Style, New in Box!
Cutler-Hammer AN16NN0B - New Style, New in Box!
Cutler-Hammer AN16NN0B - New Style, New in Box!
Cutler-Hammer AN16NN0A - New Style, New in Box!
Cutler-Hammer AN16NN0A - New Style, New in Box!
Cutler-Hammer A201K6CX - New Style, New in Box!
Cutler-Hammer A201K6CA - New Style, New in Box!
Cutler-Hammer A201K5CX - New Style, New in Box!
Cutler-Hammer A201K5CA - New Style, New in Box!
Cutler-Hammer A201K4CX - New Style, New in Box!
Cutler-Hammer A201K4CA - New Style, New in Box!
Cutler-Hammer A201K3CX - New Style, New in Box!
Cutler-Hammer A201K3CA - New Style, New in Box!
Cutler-Hammer A200M6CX - New Style, New in Box!
Cutler-Hammer A200M6CAC - New Style, New in Box!
Cutler-Hammer A200M5CX - New Style, New in Box!
Cutler-Hammer A200M5CAC - New Style, New in Box!
Cutler-Hammer A200M4CX - New Style, New in Box!
Cutler-Hammer A200M4CW - New Style, New in Box!
Cutler-Hammer A200M4CB - New Style, New in Box!
Cutler-Hammer A200M4CAC - New Style, New in Box!
Cutler-Hammer A200M3CX - New Style, New in Box!
Cutler-Hammer A200M3CW - New Style, New in Box!
Cutler-Hammer A200M3CB - New Style, New in Box!
Cutler-Hammer A200M3CAC - New Style, New in Box!
Square D KA36250 - New Style, New In Box!
Square D KA36200 - New Style, New in Box
|
在線咨詢 
