Diode-based capacitor memory uses relatively small capacitor, and uses a diode as an access device instead of MOS transistor, wherein the diode has four terminals, the first terminal is connected to a word line, the second terminal is connected to the first plate of capacitor which serves as a storage...http://www.google.com.au/patents/US7466586?utm_source=gb-gplus-sharePatent US7466586 - Diode-based capacitor memory and its applications
