Sensors 2011, 11(9), 8836-8854; doi:10.3390/s110908836

Detailed Study of Amplitude Nonlinearity in Piezoresistive Force Sensors

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Received: 28 July 2011; in revised form: 8 September 2011 / Accepted: 9 September 2011 / Published: 14 September 2011
(This article belongs to the Section Physical Sensors)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: This article upgrades the RC linear model presented for piezoresistive force sensors. Amplitude nonlinearity is found in sensor conductance, and a characteristic equation is formulated for modeling its response under DC-driving voltages below 1 V. The feasibility of such equation is tested on four FlexiForce model A201-100 piezoresistive sensors by varying the sourcing voltage and the applied forces. Since the characteristic equation proves to be valid, a method is presented for obtaining a specific sensitivity in sensor response by calculating the appropriate sourcing voltage and feedback resistor in the driving circuit; this provides plug-and-play capabilities to the device and reduces the start-up time of new applications where piezoresistive devices are to be used. Finally, a method for bypassing the amplitude nonlinearity is presented with the aim of reading sensor capacitance.
Keywords: piezoresistive; force; sensor; nonlinear; model; tanh; piezocapacitive; FlexiForce
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MDPI and ACS Style

Paredes-Madrid, L.; Emmi, L.; Garcia, E.; De Santos, P.G. Detailed Study of Amplitude Nonlinearity in Piezoresistive Force Sensors. Sensors 2011, 11, 8836-8854.

AMA Style

Paredes-Madrid L, Emmi L, Garcia E, De Santos PG. Detailed Study of Amplitude Nonlinearity in Piezoresistive Force Sensors. Sensors. 2011; 11(9):8836-8854.

Chicago/Turabian Style

Paredes-Madrid, Leonel; Emmi, Luis; Garcia, Elena; De Santos, Pablo Gonzalez. 2011. "Detailed Study of Amplitude Nonlinearity in Piezoresistive Force Sensors." Sensors 11, no. 9: 8836-8854.

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