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Temperature variation of actuation voltage in capacitive MEMS switchesMicrowave and Wireless Components Letters, IEEE In Microwave and Wireless Components Letters, IEEE, Vol. 15, No. 10. (2005), pp. 718-720.
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Notes for this article• Temperature variation can cause unnecessary large variation in control voltage. Operation at low temperature will require excessive large actuation voltage (at low voltage, extreme tensile stress is induced).
• Previous published data showed temperature variation of actuation voltage in the order of 0.3-0.5V/C.
• This paper reports 0.127-0.132V/C variation in the -45~70C range.
• Critical buckling of the shunt bridge is observed by the capacitance reading.
• Devices from two different wafers exhibit actuation voltage difference of about 8V, (out of 24~32V)
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AbstractA simple theoretical model for temperature variation of actuation voltage for fixed-fixed beam switches is developed and applied to model capacitive radio frequency microelectromechanical systems switches. Measured data from these switches fit very well with the model over a 120°C operating temperature range, demonstrating an average 0.127V/°C to 0.132V/°C with less than 8% deviation between measured and modeled results. The proposed model provides valuable insight into the factors impacting variability of actuation voltage over broad temperature ranges.
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