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Understanding Smart Sensors - Nomads.usp

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26 <strong>Understanding</strong> <strong>Smart</strong> <strong>Sensors</strong>Silicon fusion bonding processSilicon sensing waferStep 1Anisotropically etched cavityHydratedsurfaceSilicon constraint waferEtched-back surfaceFusedinterfaceStep 2Step 3Ground and polished surfacefor final wafer thickness(a)Conventional absolute-pressure sensorASilicon-fusion-bondedtop waferAEquivalent silicon-fusion-bonded sensorFigure 2.5 (a) Silicon fusion bonding process and (b) its effect on die size. (After: [12].)(b)

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