Level shifter circuits are used to configure analog or multilevel memory cells. A level shifter circuit generates an output voltage that is above the input voltage by an offset voltage value. The magnitude of this offset voltage or the relationship between the input and output voltages of the level shifter...http://www.google.com.au/patents/US6184726?utm_source=gb-gplus-sharePatent US6184726 - Adjustable level shifter circuits for analog or multilevel memories
