1. Beta Model: $R(T) = R_{25} \exp\left(\beta \left[\frac{1}{T} - \frac{1}{T_0}\right]\right)$, where temperatures are in Kelvin ($T_0 = 298.15\text{ K}$).

2. Steinhart-Hart Equation: $\frac{1}{T} = A + B \ln(R) + C (\ln R)^3$.

3. Linearizing Resistor Optimization: To maximize sensitivity around a center temperature $T_{mid}$, choose $R_{fix} \approx R(T_{mid})$.