NIMCET 2015 — Computer PYQ
NIMCET | Computer | 2015The minimum number of MOS transistors required to make a dynamic RAM cell is
Choose the correct answer:
- A.
1
(Correct Answer) - B.
2
- C.
3
- D.
4
1
Explanation
Explanation:
Dynamic RAM (DRAM) stores each bit of data in a separate capacitor within an integrated circuit. However, to access this stored charge (for reading or writing), a switching mechanism is required.
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1-Transistor Cell (1T DRAM): The most common and modern design of a DRAM cell consists of exactly one MOS transistor and one capacitor.
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Function: The MOS transistor acts as a switch that connects the capacitor to the "bit line" when the "word line" is activated.
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Comparison with SRAM: Static RAM (SRAM) is much more complex, typically requiring 6 transistors per cell to maintain the state without needing a refresh.
Because the 1T-1C (one transistor, one capacitor) configuration is the most basic functional unit of dynamic memory, the minimum number of transistors needed is 1.
Conclusion: The minimum number of MOS transistors required is 1.
The correct option is (a).