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Switching time jitter is one of the important properties to consider when selecting a closing switch for a pulsedpower system, and the most time-precise triggering can be achieved by the use of lasers. For a mid-gap laser-triggered spark gap, three different physical mechanisms can be used: nonresonant multiphoton ionization, resonant-enhanced multiphoton ionization and electron tunneling. The first...
This paper presents a reliability study on a 15×15mm2 silicon interposer packages, 5 times larger surface than usual studies on wafer level chip scale package (WLCSP). Works were conducted in the frame of silicon platform developments for heterogeneous RF 3D modules, where the interconnections number is lower than in digital applications but the silicon interposer larger than conventional WLCSP. Several...
This paper is dedicated to thermomechanical simulations for the development of a solder joint fatigue model for large silicon interposers. Works were conducted in the frame of silicon platform developments for heterogeneous RF or MEMS 3D modules, where the silicon interposer could be larger than conventional WLCSP. TCoB tests have been carried out on 14.6 mm×14.6 mm×0.4 mm silicon interposer with...
Measurements and multiphysics simulations of all-dielectric LiNbO3 grating modulators exposed to high power microwave pulses were conducted. Thinned substrate devices exposed to 180kV/cm fields show no significant degradation in measured optical spectrum or link gain.
A compact electro-optic modulator comprising a waveguide grating formed on a small piece of lithium niobate can be integrated directly into an X-band antenna array element. A prototype link with this modulator was demonstrated.
With the fast growth of mobile phone market, image sensor and camera module production have skyrocketed in recent years. Semiconductor industry has been put a lot of effort in camera module design, assembly, and test technologies. The technology platform was mainly developed from normal BGA platform. However, camera module is more complex than normal BGA in design, assembly, and test. There were special...
In this paper, four-point cyclic bend test was conducted for PBGA (plastic ball grid array) assembly with Sn-3.5Ag lead free solder joint. Bending fatigue life of solder joint was recorded by measuring resistance of the designed daisy-chain for solder joints. Failure analysis was performed using dye penetration and the critical solder joint location was observed. Then, comprehensive finite element...
WiMAX (IEEE 802.16) is a broadband wireless access technology that enables convergence of mobile and fixed broadband networks through scalable OFDMA (Orthogonal Frequency Division Multiple Access) technology. This paper presents an analytical study of WiMAX propagation channel and estimates the channel capacity through simulation. WiMAX channel performance of different spectrum frequency bands applied...
Even though free space optic (FSO) has the capacity to go beyond the limit of fiber optics but unfortunately FSO suffers a few limitations caused by its transmission medium, the atmosphere. Thus, detail research is needed to study the characteristic of free space optic so as to improve the system subsequently. Simulation using measured parameters is important to gain certain understanding and some...
Genetic algorithms (GAs) are powerful search techniques that are used successfully to solve problems in many different disciplines. One application would be in WCDMA adaptive beam forming technique. Adaptive antenna has dynamic beam to cater for users' needs and provides better capacity for mobile communication but requires more intelligent and advance beam forming algorithm such as genetic algorithm...
WiMAX (IEEE 802.16) is a broadband wireless access technology that enables convergence of mobile and fixed broadband networks through scalable OFDMA (orthogonal frequency division multiple access) technology. This paper presents the modeling of WiMAX propagation channel statistically. WiMAX channel performance of different frequency bands applied in Asia Pacific region are investigated and evaluated...
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