Large-Scale Nonlinear Lumped and Integrated Field Simulations of Top-Orthogonal-to-Bottom-Electrode CMUT Architectures

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Chris Ceroici, Roger J Zemp

Abstract

Capacitive micromachined ultrasonic transducers (CMUTs) promise many advantages over traditional piezoelectric transducers such as the potential to construct large, cost-effective 2-D arrays. To avoid wiring congestion issues associated with fully wired arrays, top-orthogonal-to-bottom electrode (TOBE) CMUT array architectures have proven to be a more practical alternative, using only 2N wires for an N ×N array. Optimally designing a TOBE CMUT array is a significant challenge due to the range of parameters from the device level up to the operating conditions of the entire array. Since testing many design variations can be prohibitively expensive, a simulation approach accounting for both the small and large-scale array characteristics of TOBE arrays is essential. In this paper, we demonstrate large-scale TOBE CMUT array simulations using a nonlinear CMUT lumped-circuit model. We investigate the performance of the array with different CMUT design parameters and array operating conditions. These simulated results are then compared with measurements of TOBE arrays fabricated using a sacrificial release process.

References

Dec 20, 2003·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Omer OralkanButrus T Khuri-Yakub
Jun 19, 2007·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Hayrettin KöymenSelim Olcum
Feb 25, 2010·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·H Kagan OguzHayrettin Köymen
Aug 18, 2012·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Hayrettin KöymenAsli Unlügedik
Jan 30, 2014·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Alex SampaleanuRoger J Zemp

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