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| Capacitors as memory |
| 08.13.07 (1:03 am) [edit] |
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Capacitors as memory
Capacitors can be charged, and when they are charged they can be discharged.
When charged they act like a source of voltage but only for a limited time unless they are "refreshed”.
If charged they can be "refreshed" by charging them again and again to keep their voltage above a specified minimum. This procedure can be quite automatic at regular intervals and applies only to capacitors that already have a voltage that is above that set minimum.
”Writing" into a capacitor-memory means either charging that capacitor or discharging it as required. We say that a memory is "a zero" if its voltage is below a specified value, and it is "a one" if above. Putting a 1 into the memory means charging the capacitor, while putting a 0 into the memory means discharging the capacitor.
”Reading" a capacitor-memory is equivalent to putting a voltmeter across its terminals to see whether its voltage is or is not above a given minimum.
Memorandum: Modern memories us
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