Multiple choice

A dynamic RAM call, which holds 5V, has to be refreshed every 20 m/sec such that stored voltage does not fall below 0.5V. If the call has a constant discharge current of 0.1 pA, the storage capacitance of the call is

  1. 4 × 10-6

  2. 4 × 10-9

  3. 4 × 10-12

  4. 4 × 10-15
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

C = $\dfrac{1t}{V}$ = $\dfrac{0.1 \times 10^{-12} \times 20 \times 10^-3}{0.5}$ = 4 × 10-15 F

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