ElectronicsI_L15 - Lecture 15 T-model Other models If we...

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Lecture 15
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T-model
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Other models If we want to add the channel- length modulation to the T- model, we simply put r o in parallel with the FET If we want to add the body effect, recall that we can treat this as a second gate, modulating the channel current by the source-body voltage. We can write an equivalent transconductance and add a fourth terminal with an associated second current source m mb g g χ = SB f V + = φ γ 2 2
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The characteristic amplifier that we will look at will use the current biasing method. It was mentioned earlier that this method is the best choice for the amplifiers. For the first time we have to consider the internal working of the amplifier. One result of this is that we have two types of amplifiers: – Unilateral: These amplifier’s do not have internal feedback which affects their input and output resistance – Non-Unilateral amplifiers: their input and output resistance is affected by the load and the source resistance respectively (read that again, in case you missed it!)
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ElectronicsI_L15 - Lecture 15 T-model Other models If we...

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