Transcription of (Saturated) MOSFET Small-Signal Model …
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(Saturated) MOSFET Small-Signal Model …
EE 105 fall 1998 Lecture 11( saturated ) MOSFET Small-Signal ModelnConcept: find an equivalent circuit which interrelates the incremental changes in iD, vGS, vDS, etc. for the MOSFET in saturationvGS = VGS + vgs , iD = ID + id -- we want to find id = (?) vgsWe have the functional dependence of the total drain current in saturation:iD = n Cox (W/2L) (vGS - VTn )2 (1 + nvDS) = iD(vGS, vDS)Solution: do a Taylor expansion around the DC operating point (also called the quiescent point or Q point) defined by the DC voltages Q(VGS, VDS):If the Small-Signal voltage is really small , then we can neglect all everything past the linear term --where the partial derivative is defined as the transconductance, iDQvgs()12---vGS22 iDQvgs() +++=iDIDvGS iDQvgs()+IDgmvgs+==11EE 105 fall 1998 Lecture 11 TransconductanceThe Small-Signal dra
EE 105 Fall 1998 Lecture 11 (Saturated) MOSFET Small-Signal Model Concept: find an equivalent circuit which interrelates the incremental changes in iD, vGS, vDS, etc. for the MOSFET in saturation
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