Small signal low frequency FET model-page-1

ID = f(VGS, VDS) --------(1)

Total change in ID due to simultaneous change in VGS& VDS is approximately given my first two terms of the Taylor’s & series expansion of equn (1)

ΔID = id

ΔvGS = vgs

ΔvDS = vds

 

Drain resistance or output resistance

The electrical network which satisfies (3) is called small signal model of FET.

 

 


 

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