\[\text{f}_{\text{H}}=\frac{1+\text{g}_{\text{m}} \text{R}_{\text{L}}}{2 \pi \text{C}_{\text{L}} \text{R}_{\text{L}}} \approx \frac{\text{g}_{\text{m}}}{2 \pi \text{C}_{\text{L}}}=\frac{\text{f}_{\text{T}} \text{C}_{\text{e}}}{\text{C}_{\text{L}}}=\frac{\text{g}_{\text{m}}+\text{g}_{\text{b}}^{\prime} \text{e}}{2 \pi\left(\text{C}_{\text{L}}+\text{C}_{\text{e}}\right)}\]
\[\text{f}_{\text{H}}=\frac{1+\text{g}_{\text{m}} \text{R}_{\text{L}}}{2 \pi \text{C}_{\text{L}} \text{R}_{\text{L}}} \approx \frac{\text{g}_{\text{m}}}{2 \pi \text{C}_{\text{L}}}=\frac{\text{f}_{\text{T}} \text{C}_{\text{e}}}{\text{C}_{\text{L}}}=\frac{\text{g}_{\text{m}}+\text{g}_{\text{b}}^{\prime} \text{e}}{2 \pi\left(\text{C}_{\text{L}}+\text{C}_{\text{e}}\right)}\]
\[\text{f}_{\text{H}}=\frac{1+\text{g}_{\text{m}} \text{R}_{\text{L}}}{2 \pi \text{C}_{\text{L}} \text{R}_{\text{L}}} \approx \frac{\text{g}_{\text{m}}}{2 \pi \text{C}_{\text{L}}}=\frac{\text{f}_{\text{T}} \text{C}_{\text{e}}}{\text{C}_{\text{L}}}=\frac{\text{g}_{\text{m}}+\text{g}_{\text{b}}^{\prime} \text{e}}{2 \pi\left(\text{C}_{\text{L}}+\text{C}_{\text{e}}\right)}\]
\[\text{f}_{\text{H}}=\frac{1+\text{g}_{\text{m}} \text{R}_{\text{L}}}{2 \pi \text{C}_{\text{L}} \text{R}_{\text{L}}} \approx \frac{\text{g}_{\text{m}}}{2 \pi \text{C}_{\text{L}}}=\frac{\text{f}_{\text{T}} \text{C}_{\text{e}}}{\text{C}_{\text{L}}}=\frac{\text{g}_{\text{m}}+\text{g}_{\text{b}}^{\prime} \text{e}}{2 \pi\left(\text{C}_{\text{L}}+\text{C}_{\text{e}}\right)}\]