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BSI PD IEC/TR 63017:2015

BSI PD IEC/TR 63017:2015

$102.76

Flexible printed circuit boards (FPCBs). Method of compensation of impedance variations

Published By Publication Date Number of Pages
BSI 2015 20
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This Technical Report specifies a compensation method of Cu linewidth according to impeadance reduction by using noise suppression materials (hereafter referred to as NSMs) for FPCBs.

This Technical Report presents an optimum result for maintaining a designated performance of FPCBs by using NSMs. It also indicates a measuring method for an impedance variation of FPCBs using NSMs with the prevailing TDR (time domain reflectometry) method. This method is resticted to measuring only the variation of an impedance value in accordance with the variation of the Cu linewidth by using NSMs for FPCBs. This report, however, neither determines nor indicates the structure or material of FPCBs.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
5 FOREWORD
7 1 Scope
2 Normative references
3 Apparatus
3.1 Time domain reflectometry
3.2 Block diagram for impedance measuring
Figures
Figure 1 – TDR test system
8 4 Test specimen
4.1 General
4.2 Structure
Figure 2 – Two types of impedance structure of FPCB
9 4.3 Test method
Figure 3 – Schematic diagram of a test specimen
10 4.4 Calculation
Figure 4 – Impedance value of two type FPCB (bare and shield)
11 5 Report
Figure 5 – Compensation value (∆L) of the Cu line width for the shield FPCB
12 Annex A (normative) Block diagram for impedance measuring with TDR
Figure A.1 – TDR test system according to IPC 2141a-9-1
Figure A.2 – TDR test system according to Agilent TDR 54754A
13 Annex B (informative) Theoretical background
Figure B.1 – Two types of impedance structure of FPCBs
Figure B.2 – Comparison of the impedance value of a bare FPCB versus a shield FPCB
14 Annex C (informative) Example of an impedance measurement with TDR
Figure C.1 – Photographic view of the impedance measurement with TDR
15 Annex D (informative) Hand contact effect
Figure D.1 – Effect of impedance variation by hand contact for bare FPCB
16 Annex E (informative) Test result
E.1 Shield 1 FPCB
Figure E.1 – Measurement result of the test specimen for shield 1 FPCB
Tables
Table E.1 – Cross-section of test specimen with using shield 1 FPCB
17 E.2 Shield 2 FPCB
Figure E.2 – Measurement result of the test specimen for shield 2 FPCB
Table E.2 – Cross-section of test specimen with using shield 2 FPCB
18 Bibliography

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BSI PD IEC/TR 63017:2015
$102.76