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Design of Flip-Chip Interconnect Using Epoxy-Based Underfill Up to V-Band Frequencies With Excellent Reliability

Li-Han Hsu (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Wei-Cheng Wu (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; E. Y. Chang ; Herbert Zirath (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Y. C. Hu ; C. T. Wang ; Y. C. Wu ; S. P. Tsai
IEEE Transactions on Microwave Theory and Techniques (0018-9480). Vol. 58 (2010), 8, p. 2244-2250.
[Artikel, övrig vetenskaplig]

This study demonstrates a flip-chip interconnect with epoxy-based underfill (epsilon(r) = 3.5 and tan delta = 0.02 at 10 MHz) for packaging applications up to V-band frequencies. To achieve the best interconnect performance, both the matching designs on GaAs chip and Al2O3 substrate were adopted with the underfill effects taken into consideration. The optimized flip-chip interconnect showed excellent performance from dc to 67 GHz with return loss below -20 dB and insertion loss less than 0.6 dB. Furthermore, the dielectric loss induced by the underfill was extracted from measurement and compared with the simulation results. The reliability tests including 85 degrees C/85 % relative humidity test, thermal cycling test, and shear force test were performed. For the first time, the S-parameters measurement was performed to check the flip-chip reliability, and no performance decay was observed after 1000 thermal cycles. Moreover, the mechanical strength was improved about 12 times after the underfill was applied. The results show that the proposed flip-chip architecture has excellent reliability and can be applied for commercial applications.

Nyckelord: Design, epoxy resin, flip-chip, interconnect, millimeter wave (MMW), packaging, reliability, underfill, V-band, ghz



Denna post skapades 2010-11-09. Senast ändrad 2015-08-10.
CPL Pubid: 128813

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur