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Define TCR and stiffness and its significance with respect to MEMS.

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Define TCR and stiffness and its significance with respect to MEMS.

written 13 months ago by | • modified 13 months ago |

Define TCR and stiffness and its significance with respect to MEMS.

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written 13 months ago by |

**TCR :-**TCR stands for the Temperature Coefficient of Resistance. TCR is one of the main used parameter to characterize a resistor. The TCR define the changes in resistance as a function of the ambient temperature. The common way to express the TCR is in ppm/°C.The temperature coefficient of the resistance is calculated as follows :-

$$TCR = \frac {R_2 - R_1} {R_1 [T_2 - T_1]} * 10^{-6}$$

where,

$R_1$ = Resistance at room temperature (Ω)

$R_2$ = Resistance at operating temperature (Ω)

$T_1$ = Room temperature (°C )

$T_2$ = Operating temperature (°C )

For pure metals, it is positive means the resistance increases with temperature whereas for non-metals this coefficient is negative means the resistance decreases with increasing temperature.

**Stiffness :-**

Stiffness is a fundamental qualifier of elastically deformable mechanical micro component and micro mechanisms whose static modal, or dynamic response need to be evaluated.

MEMS mainly move by elastic deformation of their flexible components.

One way of characterizing the static response of elastic members is by defining, their relevant stiffnesses.

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