# quiz7_key - ECE124d/ECE256C Quiz 7 The logic circuit above...

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Unformatted text preview: ECE124d/ECE256C Quiz 7 The logic circuit above has a current draw in a typical triangular shape -— every 5nS it draws a peak of lSAwith a rise of IOOpS and a fall time of 400 p8. The power supply has the capability of supplying 6A DC at 1.8V, but will supply no higher currents and will not supply current beyond 1.8V and has no bandwidth restrictions (i.e. this is an idea power supply). a. Find the average current needed to run the logic. l a K «www 33; (5:4 is ‘ v.3 _.... ~. 74.3} 5 Mil—F’r«lf lnuSv 7“ 30093 c; (5.") 3:; 2c; l‘i/A—i M b. Determine a capacitor size which will maintain a 5% deviation of the power rail at all times. (describe your reasoning). T (Q g Q (919‘? f) [0 ﬂ mum/3X“ 1.9/0 0/ IF m d~ U CW3“ er/Q “13¢, \$6~7€>L43 2740243 anew/3t”- 6:513: c323 13 3 @2293 3 2.3530 M x .- -33.. 1 <3 3 33 .333- i376; m 3.3. “ﬁfe, Mac. 3 \.:> A U :3 9570 o '18!) L. quU Kari)- ”—3—— _ 15“ c. Suppose you were given a supply of l nF, lnH, 0.019 capacitors -— how many would it take to decouple the above circuit? Why? (G) 1 Pl :5 &\-vav< ‘3 128/ .3 Egg; \$3 Ldl: 150V; “1 at? 33333333 ”3' 33a ‘ L H H‘ 3.33.; La:; 10.3mm 5295* -3 L3 03W - a? 3 ...
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