DRAM

Why does DRAM need periodic refresh operations?

  1. ATo increase read speed
  2. BBecause the number of writes is limited
  3. CBecause the charge stored in the capacitor is gradually lost through leakage current
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Answer: C. Because the charge stored in the capacitor is gradually lost through leakage current

The charge stored in a DRAM capacitor is gradually lost through leakage currents in the transistor and junctions. Refresh reads and rewrites the data at regular intervals (generally within tens of milliseconds) before it is lost. A limited number of writes is a characteristic of flash memory.

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More DRAM questions

  1. Which correctly describes the read operation of DRAM?
  2. Which pair of three-dimensional structures has been used in DRAM cells to secure capacitor capacitance?
  3. Which correctly describes a property of DRAM?
  4. What does 'DDR (double data rate)' in DDR SDRAM mean?
  5. In a DRAM cell array, which line connects to the gates of the cell transistors and selects the row to be read or written?