1.52-GHz micromechanical extensional wine-glass mode ring resonators
Yuan Xie
Sheng-Shian Li
Yu-Wei Lin
Zeying Ren
Nguyen, C.T.-C.
Avago Technol., San Jose;
This paper appears in: Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on
Publication Date: April 2008
Volume: 55,
Issue: 4
On page(s): 890-907
Location: Pusan, South Korea,
ISSN: 0885-3010
INSPEC Accession Number: 9913560
Digital Object Identifier: 10.1109/TUFFC.2008.725
Current Version Published: 2008-04-25
Abstract
Vibrating polysilicon micromechanical ring resonators, using a unique extensional wine-glass-mode shape to achieve lower impedance than previous UHF resonators, have been demonstrated at frequencies as high as 1.2 GHz with a Q of 3,700, and 1.52 GHz with a Q of 2,800. The 1.2-GHz resonator exhibits a measured motional resistance of 1 MOmega with a dc-bias voltage of 20 V, which is 2.2 times lower than the resistance measured on radial contour- mode disk counterparts at the same frequency. The use of larger rings offers a path toward even lower impedance, provided the spurious modes that become more troublesome as ring size increases can be properly suppressed using methods described herein. With spurious modes suppressed, the high-Q and low-impedance advantages, together with the multiple frequency on-chip integration advantages afforded by capacitively transduced mumechanical resonators, make this device an attractive candidate for use in the front-end RF filtering and frequency generation functions needed by wireless communication devices.
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