The present invention provides a method for applying a double-side-bias operation to a virtual ground array memory composed of a matrix of N-bit memory cells. In a first embodiment, the virtual ground array is programmed by a double-side-bias method which applies the same or similar biasing voltage simultaneously...http://www.google.de/patents/US20080151642?utm_source=gb-gplus-sharePatent US20080151642 - Double-Side-Bias Methods of Programming and Erasing a Virtual Ground Array Memory
