Week 10: MOS Logic Circuits
Week 10: MOS Logic Circuits
Week 10: MOS Logic Circuits
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Dynamic Power Dissipation<br />
• The energy delivered from the VDD is:<br />
E<br />
D<br />
∞<br />
∞<br />
VC<br />
( ∞)<br />
dq(<br />
t)<br />
2<br />
= V ∫ DD<br />
i( t)<br />
dt = V ∫ DD<br />
dt = CV ∫ DD<br />
1dvC<br />
= CVDD<br />
dt<br />
0<br />
0<br />
V (0)<br />
• The energy stored by the capacitor is:<br />
E =<br />
D<br />
CV<br />
2<br />
2<br />
DD<br />
• The difference between the above two terms represents the energy<br />
lost in the resistive elements:<br />
C<br />
E = E − E =<br />
L<br />
D<br />
S<br />
CV<br />
2<br />
2<br />
DD<br />
ELE21<strong>10</strong>A © 2008<br />
Lecture <strong>10</strong> - 18
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