[Solved] In the dynamic random access memory (DRAM) of a computer, each memory cell contains a capacitor for charge storage.

In the dynamic random access memory (DRAM) of a computer, each memory cell contains a capacitor for charge storage. Each of these cells represents a single binary-bit value of “1” when its 20-fFfF capacitor (1 fF=10−15FfF=10−15F) is charged at 1.5 VV, or “0” when uncharged at 0 VV. A DRAM cell is shown in the (Figure 1).

Part A

When fully charged, how many excess electrons are on a cell capacitor’s negative plate? Express your answer using two significant figures.

Part B

After charge has been placed on a cell capacitor’s plate, it slowly “leaks” off at a rate of about 0.30 fC/sfC/s. How long does it take for the potential difference across this capacitor to decrease by 2.0%% from its fully charged value? (Because of this leakage effect, the charge on a DRAM capacitor is “refreshed” many times per second.) Express your answer to two significant figures and include the appropriate units.

Expert Answer

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Answer to In the dynamic random access memory (DRAM) of a computer, each memory cell contains a capacitor for charge storage. ……