- #1
LtIvan
- 40
- 6
Wes thu hal,
I have been researching computer hardware aspects, and I have been recently looking at RAM types, particularly DRAM. I am think of making a simple model of it for a hobby.
For a DRAM bit cell, does the capacitance value matter? What affects does it have if it is big or small, e.g. 1pF or 200uF?
Also, I read that DRAM needs to refresh each cell, because even when the transistor's gate is not conducting, the capacitor still can leak charge. In addition, I read that it is recommended that it is refreshed every 50 or 100ms. Is this a necessity for large capacitors, since a refreshing system is quite complex. I have ran several simulations of DRAM cells with large capacitor values, and they do not seem to discharge. Are the simulators inaccurate for this?
Thanks in advance,
I have been researching computer hardware aspects, and I have been recently looking at RAM types, particularly DRAM. I am think of making a simple model of it for a hobby.
For a DRAM bit cell, does the capacitance value matter? What affects does it have if it is big or small, e.g. 1pF or 200uF?
Also, I read that DRAM needs to refresh each cell, because even when the transistor's gate is not conducting, the capacitor still can leak charge. In addition, I read that it is recommended that it is refreshed every 50 or 100ms. Is this a necessity for large capacitors, since a refreshing system is quite complex. I have ran several simulations of DRAM cells with large capacitor values, and they do not seem to discharge. Are the simulators inaccurate for this?
Thanks in advance,