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1T1C DRAM (Read 2497 times)

Oceanamie New Member Offline Posts: 2	1T1C DRAM Aug 26^th, 2013, 10:15am Hello. I need some helpful hints. I have a 1T1C DRAM, 10 fF capacitor with Vt ~ 1 V. How often does this this individual cell need to be refreshed in order for the charge stored not to drop below 85% of its maximum value?
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aaron_do Senior Fellow Offline Posts: 1398	Re: 1T1C DRAM Reply #1 - Aug 26^th, 2013, 10:17pm I don't know much about DRAM, but i'm sure you need to know the off-resistance of the transistor. From there just use 85% = e^-t/RC Aaron
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Oceanamie New Member Offline Posts: 2	Re: 1T1C DRAM Reply #2 - Aug 27^th, 2013, 8:00am aaron_do wrote on Aug 26^th, 2013, 10:17pm: I don't know much about DRAM, but i'm sure you need to know the off-resistance of the transistor. From there just use 85% = e^-t/RC Aaron This is what I'm trying to solve. �I know the charge at 300 K and 400 K easily enough from the graph, but can't find the rest.
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aaron_do Senior Fellow Offline Posts: 1398	Re: 1T1C DRAM Reply #3 - Aug 27^th, 2013, 5:54pm Hi, what do you mean you found the charge from the graph? The charge is just Q = CV. The first question is basically trying to see if you know what is the maximum voltage that can be written. After that, the leakage current is read from the graph. From there, you need to know that the total charge leakage is Q = I*t. Aaron
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