DRAM

In DRAM cell arrays, which bit-line arrangement places the paired bit lines side by side within the same array?

  1. ADivided word-line architecture
  2. BOpen bit-line architecture
  3. CFolded bit-line architecture
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Answer: C. Folded bit-line architecture

In the folded bit-line architecture, the pair of bit lines connected to a sense amplifier runs side by side in the same array, so noise couples equally onto both and is easily cancelled differentially. The open bit-line architecture, which places the paired lines in separate arrays on either side, is more noise-sensitive but allows a smaller cell area (such as 6F²).

  • A. A divided word line is not a bit-line pairing arrangement.
  • B. The open bit-line architecture places the paired lines in separate arrays on either side of the sense amplifier.
  • C. Correct. The paired bit lines run side by side in the same array.
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  1. Which correctly describes the idea of "8n prefetch" used in memories such as DDR4 SDRAM?
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  5. Which correctly describes the structure of a typical 1-bit DRAM memory cell?