Development of SMD 32.768 kHz tuning fork-type crystals
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Sungkyu Lee
Abstract
Taguchi' design of experiment method and statistical F-test were used to optimize design of tuning forks for use in Qualcomm® mobile station modem (MSM)-3000TM series central processing unit chips of code division multiple access, personal communication system, and global system for mobile communication systems. Design parameters for motional capacitance C1 was further optimized after much trial and error so that as-fabricated resonance frequency values of a tuning fork blank remain almost the same prior to final frequency adjustment plating of the mounted crystals, regardless of packaging pressure change from ambient to designated 6 × 10– 5 Torr. Finite element method modeling was used in conjunction with Taguchi' design of experiment method and, after much trial and error, this enabled selection of essential design parameters to effectively manufacture tuning fork test samples using photolithography with subsequent photoresist spray coating. The tuning fork test samples thus fabricated were characterized and analyzed using Taguchi' method and statistical F-test to evaluate sensitivity of motional capacitance C1 and as-fabricated resonance frequency for various design parameters at ambient to designated packaging pressure of 6 × 10– 5 Torr. Motional capacitance C1 is most sensitive to tine width and tine surface electrode width. Unlike as-fabricated resonance frequency values, motional capacitance values do change with vacuum level of the package. However, tine width asymmetry, electrode thickness and tine tip electrode thickness could be freely adjusted for crystal impedance level without affecting resonance frequency and motional capacitance value. Other design parameters could be adjusted to best suit the manufacturing process.
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© 2008, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents
- Contents
- Basic
- A model to calculate the viscosity of silicate melts
- A model to calculate the viscosity of silicate melts
- A note on the application of the phase rule
- Thermodynamic properties of liquid silver–indium–tin alloys determined from emf measurements
- Unconstrained solidification and characterisation of near-eutectic Al–Cu–Ag alloys
- Tensile properties of L12 intermetallic foils fabricated by cold rolling
- Microstructural control of FeB-inoculated mottled low-alloy white iron by a design of experiments approach
- Applied
- Dislocation structure and crystallite size distribution in lath martensite determined by X-ray diffraction peak profile analysis
- Effect of minor addition of Pb upon interfacial reactions and mechanical properties at Sn-3.0Ag-0.5Cu/Cu and Sn-58Bi/Cu solder joints
- Elastic properties of braided ceramic matrix composites
- The influence of microstructural characteristics and contaminants on the mechanical properties and fracture topography of low cost Ti6Al4V alloy
- Microstructure and room temperature mechanical properties of Hf and Sn-doped Nb-20Ti-5Cr-3Al-18Si alloy
- The effect of alloying elements on constrained carbon equilibrium due to a quench and partition process
- Hardfacing behavior of Cr–Ni stainless steel with Co-based super alloys
- Development of SMD 32.768 kHz tuning fork-type crystals
- Notification
- DGM News
