04 Transistor RC

04 Transistor RC - EE115C Winter 2010 Digital Electronic...

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EE115C – Winter 2010 igital Electronic Circuits Digital Electronic Circuits Lecture 4: Transistor R & C
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Why Do We Care …? ± Want fast logic gates (i.e. low gate delay) ± ant low power consumption Want low power consumption ± Delay and power depend on transistor behavior ± esistance 3 Resistance ± Capacitance 1.5 2 2.5 V out (V) V M 5 5 5 -0.5 0 0.5 1 EE115C 2 0 0.5 1 1.5 2 2.5 x 10 -10 t (sec) Delay of the Gate
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nMOS As A Switch D R on = f ( V GS , V DS ) D D V S G V DS G G V GS V T V GS V T GS S S S nMOS Ideal Situation: Real Situation: EE115C 3 Transistor A Switch R and C
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pMOS As A Switch D R on = f ( V SG , V SD ) D D V S G V DS G G V SG | V Tp | V SG | V Tp | GS S S S pMOS Ideal Situation: Real Situation: EE115C 4 Transistor A Switch R and C
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The Equivalent Resistance of the Transistor V GS V T R on I D V GS = V DD SD R mid R V DS V D V D /2 0 () 0 2 1 R R R mid eq + = + = 2 1 DD DD V V R DD DD ( ) ( ) + + 2 1 1 2 DD DSAT DD DSAT eq V I V I λ DD V 5 3 5 DD DSAT eq V
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04 Transistor RC - EE115C Winter 2010 Digital Electronic...

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