115C_1_04_ee_115c_mos_rc

115C_1_04_ee_115c_mos_rc - EE115C Digital Electronic...

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Unformatted text preview: EE115C Digital Electronic Circuits Lecture 4: Transistor R & C EE115C 2 Why Do We Care ? 0.5 1 1.5 2 2.5 x 10-10-0.5 0.5 1 1.5 2 2.5 3 t (sec) V out (V) V M Delay of the Gate Want fast logic gates (i.e. low gate delay) Want low power consumption Delay and power depend on transistor behavior Resistance Capacitance EE115C 3 nMOS As A Switch V GS nMOS Transistor R on = f ( V GS , V DS ) Ideal Situation: A Switch S D G V DS S D G S D G V GS V T Real Situation: R and C V GS V T EE115C 4 pMOS As A Switch V GS pMOS Transistor R on = f ( V SG , V SD ) Ideal Situation: A Switch S D G V DS S D G S D G V SG | V Tp | Real Situation: R and C V SG | V Tp 5 The Equivalent Resistance of the Transistor V GS V T S D R on 2 1 2 1 2 1 DD DSAT DD DD DSAT DD eq V I V V I V R DD DSAT DD eq V I V R 6 5 1 4 3 I D V DS V DD V DD /2 V GS = V DD R mid R 2 1 R R R mid eq EE115C 6 Equivalent Resistance 0.5 1 1.5 2 2.5 1 2 3 4 5 6 7 x 10 5 V DD (V) R eq (Ohm) W / L =1, L =0.25=0....
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This note was uploaded on 04/16/2011 for the course EE 115C taught by Professor N/a during the Spring '10 term at UCLA.

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115C_1_04_ee_115c_mos_rc - EE115C Digital Electronic...

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