Estimate the input resistance, output resistance, small-signal voltage gain and lower cut-off frequency of the following circuit, given that g_{m} = 72 mS .
Much of the analysis is similar to that of earlier examples. From the above we have
\begin{matrix} r_{i} ≈ R_{1}//R_{2} = 1 MΩ//2 MΩ = 667 kΩ \\ r_{o} ≈ 1/g_{m} = 1/72 × 10^{-3} ≈ 14 Ω \\ \frac{v_{o}}{v_{i}} \approx 1 \end{matrix}
The lower cut-off frequency is given by
f_{o} \approx \frac{1}{2 \pi r_{i}C} = \frac{1}{2 × \pi × 667 × 10^{3} × 1 × 10^{-6}} = 0.24 Hz