【電磁技術(shù)在線】【EDA篇】- 4. 連接器
講師：Milan PR'IHODA
00：00 什么是連接器
02：45 test fixture 夾具（PCB，啟動器等）
05：40 S21dd 參數(shù)
07：30 S11dd 參數(shù)
09：15 S11dc (LCL) 參數(shù) (S12dc是LCTL )
13：30 夾具設(shè)計技巧
13：45 技巧1：傳輸線部分 (精確同軸，重復(fù)性，匹配）
14：50 技巧2：共模數(shù)據(jù) (仿真）
16：00 技巧3：對稱模型 (via，網(wǎng)格）
19：35 技巧4：夾具最小化 （參考面，TRL）
26：10 技巧5：測量數(shù)據(jù)提取三維模型
Connectors are integral part of any transmission system. They allow to interconnect systems orcircuits via cables, but what is important – they represents a discontinuity. And effects of the discontinuity grow with frequency, which means that reflections, Differential to common mode conversion and radiation are always there. Therefore the precise connector characterization is required.
In this video, you will learn what causes the discrepency between simulation results and measurement results, particularly for multipin connectors.
When compare the simulation with measurement, the effects of the test fixture cannot be ignored. The test fixture for connector measurement has a significant impact on the all measured parameters of the connector. Test fixtures are mandatory for VNA Measurement, and they are often assumed as ideal and ignored.
Recommendations for the Fixture Design:
-
Precision launchers should be used(Matching,Repeatbility)
-
Fixture must be symmetrical (LCL!, LCTL!)
-
Reference planes should be as close aspossible to the connector itself (RL,IL)
-
Do not forget Common Mode
-
Fixture must be well defined and characterized (3DModel Extraction)
CST STUDIO SUITE is an excellent tool for all the stages of proposed workflow:
-
Connector design including yield analysis
-
Fixture design
-
3D model extraction from the measured data
-
Prediction of connector performance in real environment
