Hybrid-pi model: Difference between revisions

Revision as of 22:33, 16 November 2015

Revision as of 00:23, 18 November 2015

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is often called ''overdrive voltage''.

:<math>r_\text{o} = \left.\frac{v_\text{ds}}{i_\text{d}}\right\vert_{v_\text{gs} = 0}</math>

is the output resistance due to [[channel length modulation]], calculated using the Shichman-Hodges model as

:<math>\begin{align}

:<math> r_\text{o} ~&=~ \frac{1}{I_\text{D}}\left(\frac{1}{\lambda} + V_\text{DS}\right) ~\approx~ \frac{V_E L}{I_\text{D}}</math>,

&= \frac{1}{I_\text{D}}\leftV_E L + V_\text{DS}\right) \approx \frac{V_E L}{I_\text{D}}

\end{align}</math>

:<math>r_\text{o} ~=~ \frac{1}{I_\text{D}}\left(\frac{1}{\lambda} + V_\text{DS}\right) ~\approx~ \frac{V_E L}{I_\text{D}}</math>,

using the approximation for the ''channel length modulation'' parameter, λ:<ref name=Sansen>

{{cite book