How is Ferroelectric RAM Operated?

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SUMMARY

Ferroelectric RAM (FeRAM) operates by utilizing a ferroelectric crystal within a capacitor to store data. To write a bit, the polarization of the ferroelectric material must be switched, requiring the application of a voltage of opposite polarity. The discussion highlights the complexity of reversing the voltage in FeRAM compared to traditional DRAM, where bits are represented by charged or uncharged capacitors. A schematic unit cell for DRAM is referenced to illustrate the differences in operation.

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Anthus
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Hi,
the schematic unit cell in DRAM is drawn below:
https://docs.google.com/file/d/0BzvjZoZeQg3nd1JYNTdGOTdIS2c/edit?usp=sharing

Here, "zero" or "one" are simply capacitor charged or not. So to write a bit, we attach (or not) a source (Vcc) voltage with switch WBIT.

In the case of FeRAM, we have a ferroelectric crystal inside a capacitor. Now, to write a bit, we have to switch polarization of ferroelectric, thus we have to be able to attach a voltage also of the opposite sign. First idea is to replace source and ground, but it is probably not smart solution. It seems to be more complicated. Does anybody know how is it solved?
 
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So, the voltage is somehow reversed. Thank you.
 

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