Solved: Consider the use of capacitors as memory cells. A

Chapter , Problem 92

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Consider the use of capacitors as memory cells. A chargedcapacitor would represent a one and an uncharged capacitora zero. Suppose these capacitors were fabricated on a siliconchip and each has a capacitance of 30 femto-farads(l fF = 10-15 F.) The dielectric filling the space betweenthe parallel plates has dielectric constant K = 25 and adielectric strength of 1.0 X 109V/m. (a) If the operatingvoltage is 1.5 V, how many electrons would be stored on oneof these capacitors when charged? (b) If no safety factor isallowed, how thin a dielectric layer could we use for operationat 1.5 V? (c) Using the layer thickness from your answerto part (b), what would be the area of the capacitor plates?

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