Publication

Small signal modeling of charge and piezoresistive modulations in active MEM resonators

Mihai Adrian Ionescu
2009
Conference Papers

Abstract

In this work we establish novel analytical and small signal circuit modeling of two major effects that co-exist in active Micro-Electro-Mechanical resonators: charge and piezoresistance modulations. Analytical expressions for the output current of vibrating body field effect transistors including capacitive, FET and piezoresistive current components are established and an equivalent small signal circuit is validated experimentally. Two design cases of vibrating FETs are studied and analyzed in detail: (i) a 2 MHz flexural mode resonator operating in a charge-dominant modulation, (ii) a 30 MHz bulk mode resonator operating with significant piezoresistive modulation. Proposed models are able to accurately predict device transfer characteristics at resonance and the influence of various bias levels and configurations. ©2009 IEEE.

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https://infoscience.epfl.ch/entities/publication/b61544ea-9da9-42b1-a789-2b5ba05a396d

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Mihai Adrian Ionescu
2009
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b61544ea-9da9-42b1-a789-2b5ba05a396d

About this result

Related concepts (32)

Equivalent circuit

In electrical engineering, an equivalent circuit refers to a theoretical circuit that retains all of the electrical characteristics of a given circuit. Often, an equivalent circuit is sought that simplifies calculation, and more broadly, that is a simplest form of a more complex circuit in order to aid analysis. In its most common form, an equivalent circuit is made up of linear, passive elements. However, more complex equivalent circuits are used that approximate the nonlinear behavior of the original circuit as well.

Small-signal model

Small-signal modeling is a common analysis technique in electronics engineering used to approximate the behavior of electronic circuits containing nonlinear devices with linear equations. It is applicable to electronic circuits in which the AC signals (i.e., the time-varying currents and voltages in the circuit) are small relative to the DC bias currents and voltages. A small-signal model is an AC equivalent circuit in which the nonlinear circuit elements are replaced by linear elements whose values are given by the first-order (linear) approximation of their characteristic curve near the bias point.

Linear circuit

A linear circuit is an electronic circuit which obeys the superposition principle. This means that the output of the circuit F(x) when a linear combination of signals ax1(t) + bx2(t) is applied to it is equal to the linear combination of the outputs due to the signals x1(t) and x2(t) applied separately: It is called a linear circuit because the output voltage and current of such a circuit are linear functions of its input voltage and current. This kind of linearity is not the same as that of straight-line graphs.

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