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Development of Ultrabroadband (DC–50 GHz) Wafer-Scale Packaging Method for Low-Profile Bump Flip-Chip Technology

机译:薄型凸点倒装芯片技术的超宽带(DC–50 GHz)晶圆级封装方法的开发

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摘要

A locally matched flip-chip (LMFC) interconnect that uses a capacitive compensation technique to minimize impedance mismatch in coplanar waveguide lines is described. With an optimum percentage change in capacitance of 55$, pm ,$5%, we observe return loss below 25 dB over 90% of a 50 GHz bandwidth. When compared to a conventional flip-chip method, the minimum performance improvement in return loss is 10 dB and the insertion loss is smooth up to 30 GHz. The LMFC interconnect consists of two micromachined features: 1) an air cavity underneath the chip and 2) local trenches in the transition region of the flip-chip interconnect interface. A comparison of different LMFC interconnect designs to the conventional flip-chip approach is made, and design rules to obtain local trench dimensions are discussed.
机译:描述了一种局部匹配的倒装芯片(LMFC)互连,该互连使用电容补偿技术来最小化共面波导线中的阻抗失配。在电容的最佳变化百分比为55 $,pm,$ 5%的情况下,我们观察到在50 GHz带宽的90%范围内回波损耗低于25 dB。与传统的倒装芯片方法相比,回波损耗的最小性能改进为10 dB,插入损耗在30 GHz时平滑。 LMFC互连由两个微加工特征组成:1)芯片下方的气腔; 2)倒装芯片互连接口的过渡区域中的局部沟槽。比较了不同的LMFC互连设计与常规倒装芯片方法,并讨论了获得局部沟槽尺寸的设计规则。

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