1.

A dynamic RAM cell which holds 5 V has to be refreshed every 20 ms so that the stored voltage does not fall by more than 0.5 V. If the cell has a constant discharge current of 0.1 pA, the storage capacitance of cell is

Answer» Q = 20 x 10-3 x 0.1 x 10-12 = 2 x 10-15 C and .


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