A column of an integrated memory circuit includes two bit lines each with a right half and a left half and a plurality of similar memory cells connected to each half of each bit line. One of the memory cells connected to each line is used as a reference and the other cells are used for data storage....http://www.google.de/patents/US5880988?utm_source=gb-gplus-sharePatent US5880988 - Reference potential for sensing data in electronic storage element
