메뉴 건너뛰기

검색창 닫기

OBG

연구실

기타 how to confirm the impedance of the microstrip?

모아레 2010.07.10 11:16 조회 수 : 569

mckinson



Joined: 03 Sep 2003
Posts: 136
Post28 Nov 2004 15:24   

Hello ,about the 50 ohms microstrip !
Hello ,guys . Anybody knows how to confirm the impedance of the microstrip ?
For example ,I have simulated the width of the microstrip for 50 homs .But I don't
know whether the impedance of pcb tracks from pcb manufactory is correct ? How to confirm ? Best regards !
Back to top
Google
AdSense
Google Adsense

 

http://www.edaboard.com/ftopic98986.html

28 Nov 2004 15:24   

Ads


Back to top
BigBoss



Joined: 17 Nov 2001
Posts: 1177
Helped: 89
Location: Earth
Post28 Nov 2004 18:38   

Re: Hello ,about the 50 ohms microstrip !
mckinson wrote:
Hello ,guys . Anybody knows how to confirm the impedance of the microstrip ?
For example ,I have simulated the width of the microstrip for 50 homs .But I don't
know whether the impedance of pcb tracks from pcb manufactory is correct ? How to confirm ? Best regards !


Connect an 50 Ohm low ESR and inductance resistor (or 2 parallel 100 Ohm) at the end of line and measure with VNA.
Back to top
vfone



Joined: 10 Oct 2001
Posts: 2578
Helped: 358
Post28 Nov 2004 22:45   

Re: Hello ,about the 50 ohms microstrip !
You don’t need any extra components. Just measure with Network Analyzer, that is connected at both ends of the line.
Back to top
sergio mariotti



Joined: 22 Dec 2003
Posts: 469
Helped: 43
Location: Italy
Post29 Nov 2004 0:03   

Re: Hello ,about the 50 ohms microstrip !
vfone wrote:
You don’t need any extra components. Just measure with Network Analyzer, that is connected at both ends of the line.

Yes, correct, but usually it may be experimented that measured Zo differ a lot from the simulated one, also in the case that all is correct and well manufactured.
This is due to end effects and ľstrip launchers.
To reduce this effect and focalize the attention to the line only, use a Time Domain VNA. Both Agilent and Anritsu have very efficent and useful TD algoritms.
Back to top
mckinson



Joined: 03 Sep 2003
Posts: 136
Post29 Nov 2004 16:14   

Hello ,about the 50 ohms microstrip !
Appreciated !Do you think that is accurate measure the character impedance Z0 by the VNA ?
Could you please tell me the detail stap for measurement ? Best regards !
Back to top
vfone



Joined: 10 Oct 2001
Posts: 2578
Helped: 358
Post29 Nov 2004 17:59   

Re: Hello ,about the 50 ohms microstrip !
By definition the main designation of VNA is to measure impedances.
Time Domain Reflectometry (TDR) is more accurate than frequency domain Vector Network Analysis (VNA), because do not depend by frequency.
But for commercial applications frequency domain is more than ok.
Check this document:
http://cp.literature.agilent.com/litweb/pdf/5968-1947E.pdf
Back to top
hitmo



Joined: 04 Jan 2005
Posts: 40
Post13 Jan 2005 18:55   

Re: Hello ,about the 50 ohms microstrip !
u can also do it with network ana. just measure inserstion loss and return loss on smith chart. return loss will tell u the impedance of the line. if the rerunloss is as close as possible to center of the smith chart its a 50ohm line

이 게시물을
이 글의 추천인 목록 게시글 수정 내역 목록
번호 제목 글쓴이 날짜 조회 수
공지 회사 목록 모아레 2011.02.07 17787
공지 연락처 목록 모아레 2010.08.05 288
공지 유용한 사이트 모아레 2010.02.25 5529
공지 메모 정리 (미완) 모아레 2009.10.30 211
공지 연구실 장비 목록 모아레 2009.09.30 808
공지 주문, 구입 리스트 모아레 2009.09.21 453
공지 To do list, Short Memo 모아레 2009.08.20 455
32 BOE, Silox 에칭 테스트 과정 모아레 2010.01.25 100
31 COMSOL 교육 결제 공지 모아레 2010.08.23 100
30 Network Analyzer 모아레 2010.08.11 99
29 클린룸 관련 사이트 모아레 2009.09.21 99
28 NPGS for SEM Lithography 모아레 2009.08.07 94
27 윈도우2003 프린터 공유 문제 해결 모아레 2010.02.10 92
26 COMSOL 시뮬레이션 참고자료 모아레 2009.07.30 89
25 Coplanar Waveguide 모아레 2010.01.31 89
24 Gordon Research Conference 모아레 2010.02.21 86
23 MEMS 관련 PDF 문서 모아레 2010.02.17 84
22 Vacuum Can Leak Problem 모아레 2010.01.04 83
21 Temperature controller & heater 모아레 2009.09.18 82
20 회식 자리 모음 모아레 2009.11.07 82
19 청계천 구입 리스트 모아레 2009.10.12 81
18 Coating, SEM 사용, Wet Etching 과정 정리 모아레 2009.09.03 81
17 Keywords 모아레 2009.09.11 81
16 comsol 관리 기록 모아레 2009.06.29 80
15 옥스포드 트랜스포트 튜브 거는 것 관련 모아레 2009.07.28 79
14 E-beam evaporator 모아레 2009.08.19 77
13 Shuttle 관련 논문들 모아레 2010.01.25 77
쓰기 태그
위로