curs_5 - Curs 6 Puterea Cuprins Puterea i energia Puterea...

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Curs 6: Puterea
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CMOS VLSI Design CMOS VLSI Design 4th Ed. 7: Power 2 Cuprins Puterea și energia Puterea dinamică Puterea statică
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CMOS VLSI Design CMOS VLSI Design 4th Ed. 7: Power 3 Disiparea puterii Puterea este condusă de la o sursă de tensiune atașată pinilor V DD ai unui circuit. Puterea instantanee: Energia: Puterea medie: ( ) ( ) ( ) P t I t V t 0 ( ) T E P t dt avg 0 1 ( ) T E P P t dt T T
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CMOS VLSI Design CMOS VLSI Design 4th Ed. 7: Power 4 Puterea în elemente VDD DD DD P t I t V 2 2 R R R V t P t I t R R 0 0 2 1 2 0 C C V C dV E I t V t dt C V t dt dt C V t dV CV
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CMOS VLSI Design CMOS VLSI Design 4th Ed. 7: Power 5 Încărcarea capacitorului Când ieșirea porții are un front pozitiv Energia înmagazinată în capacitor Dar energia condusă de la sursă este Jumătate din energia de la V DD este disipată în tranzistorul pMOS ca și căldură, cealaltă jumătate este memorată Când ieșirea porții are front coborâtor Energia din capacitor este transmisă la GND Disipare ca și căldură în tranzistorul nMOS 2 1 2 C L DD E C V 0 0 2 0 DD VDD DD L DD V L DD L DD dV E I t V dt C V dt dt C V dV C V
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CMOS VLSI Design CMOS VLSI Design 4th Ed. 7: Power 6 Forme de undă comutare Exemplu: V DD = 1.0 V, C L = 150 fF, f = 1 GHz
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CMOS VLSI Design CMOS VLSI Design 4th Ed. 7: Power 7 Puterea de comutare switching 0 0 sw 2 sw 1 ( ) ( ) T DD DD T DD DD DD DD DD P i t V dt T V i t dt T V Tf CV T CV f C f sw i DD (t) VDD
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CMOS VLSI Design CMOS VLSI Design 4th Ed. 7: Power 8 Factorul de activitate Presupunem frecvența ceasului sistemului = f Fie f sw = f, unde = factor de activitate Dacă semnalul este un ceas, = 1 Dacă semnalul comută odată/ciclu de ceas, = ½ Puterea dinamică: 2 switching DD P CV f
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CMOS VLSI Design CMOS VLSI Design 4th Ed.
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