Where Can I Find out how a DRAM Works and how to Build One?

[kvnsmnsn]

I've looked over the descriptions of the different forums and can't seem to find anything that fits what I'm looking for. I'm designing a circuit that's going to be using a DRAM to store its information. I need to know what books (or websites?) I could read to tell me how a DRAM works and how to build it. What forum (on "edaboard.com" or off it) should I post to to get an answer to that question?

 

[BradtheRad]

Animation and interaction are excellent learning features in a simulator. Falstad's contains a library of circuits (including static Ram and dynamic Ram). Free to download and use:

falstad.com/circuit

At bottom left are inputs L or H which you click with the mouse to observe circuit action. 'Write', 'data', refresh. Similar to screenshot:

 

[D.A.(Tony)Stewart]

I've looked over the descriptions of the different forums and can't seem to find anything that fits what I'm looking for. I'm designing a circuit that's going to be using a DRAM to store its information. I need to know what books (or websites?) I could read to tell me how a DRAM works and how to build it. What forum (on "edaboard.com" or off it) should I post to to get an answer to that question?

Any AI engine or google search should tell you how a DRAM works with a stored voltage = "1" and discharged = "0" Using the built in capacitance of a FET, it serves as a temporary memory and the cycle time depends on the leakage current and charge voltage for a reliable Read/ Write refresh.

Meanwhile LCD monitors use a similar technology but also block light from the liquid crystal over the FET to block or pass the transmitted optical backlight so that the refresh rate can be much slower like 25 Hz for an interlaced field or faster.

But to make a real modern DRAM like Samsung or Micron requires billion-dollar fabrication plants (fabs). If you want to simulate the logic, you can use FETs or CMOS transmission gates (T-gate) aka Analog Switches or even tri-state logic IC's to read and write to a tiny low-leakage NP0 ceramic or plastic-film capacitor .

T-gates came out in the late 70's in the CD4xxx family with hundreds of ohms are also called analog switches and can be offered in the low Ohm values for other purposes. If you want to get fancy you can simulate storing an analog voltage and transfer it from one stage to the next and that was called an analog bucket-brigade shift register. Memory chips can now have more than binary (2) levels to store more than 1 bit of info per cell but this reduces the speed while at the savings in cells per bit.

As with all diodes, PN junctions in BJT's and FETs, the lower the effective resistance of conductance, the higher the capacitance when not conducting commonly defined by an Rs*C=tau time constant which varies with doping methods and junction size.

Do you need help looking up part numbers for analog switches or tri-state buffers?
Here is a Wiki link on the T-gate or analog switches.