11 FET DC Biasing - Field-Effect Transistor Basic Principle...

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1 Field-Effect Transistor DC Biasing Circuits Basic Principle
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4 +V DD R D V G R S I D I S ~I D G D S + + - - V RS V GS R C +V CC R E R Th V Th I B I C I E R C R 1 +V CC R E R 2 I B
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5 General Relationships :- Applied to the dc analysis of ALL FET amplifier circuits :- I G ~ 0A I D ~ I S 0 = - - S R GS G V V V S D G GS R I V V - = JFET / Depletion-Type MOSFET 2 ) ( 1 - = off GS GS DSS D V V I I Enhancement-Type MOSFET ( ) 2 T GS D V V k I - = Two equations Two unknown (I D , V GS ) OK ! 2 ) ( 1 - - = off GS S D G DSS D V R I V I I 0 2 = + + c bI aI D D 2 1 , DQ DQ D I I I = +V DD R D V G R S I D I S ~I D G D S + + - - V RS V GS
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10 I D V GS V GS(off) V G < 0V V G > 0V R S = 0 Ω :- G GS V V = 2 ) ( 1 - = off GS GS DSS D V V I I ( ) 2 T GS D V V k I - = One Solution !! +V DD R D V G R S I D I S ~I D G D S + + - - V RS V GS
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11 I D V GS V GS(off) V G = 0V V G = 0V & R S = 0 Ω
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This note was uploaded on 01/11/2011 for the course EE 2106 taught by Professor Ytchow during the Spring '07 term at City University of Hong Kong.

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11 FET DC Biasing - Field-Effect Transistor Basic Principle...

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