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Thermal Analysis of xFD DRAM Packages Through Simulation and Experimental Validation
Keywords: DRAM, Simulation, Validation
The design optimization for thermal management of systems relies heavily on accurate thermal models of the individual components. Invensas is developing new packaging concepts that provide enhanced and reliable performance electrically, thermally and mechanically. These development efforts use predictive finite element analysis to drive the optimization of package design for improved thermo-mechanical strain and thermal management. Therefore, it is important to validate such models through rigorous experimental thermal measurements. This work represents the 2nd half of our effort in the area of multi-die face-down stack thermal analysis. As was presented last year for the dual die face-down stack analysis, we will present details of our quad die face-down package design, assembly and the thermal test protocols. We will outline our methodologies for measuring thermal performance and achieving tight tolerances in the experimental apparatus as well as guidelines for making appropriate assumptions for associated simulations. We examined JEDEC standard test conditions for natural convection and forced air flow at various air velocities. Comparing values obtained from experimental measurements with simulation data showed results that were within 10% margin in many cases. We will discuss in detail the important calibration protocol and considerations required in the experimental test area for enhanced precision.
Ron Zhang, Director
Invensas Corporation
San Jose, CA

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