Negative power supply
 A negative power supply for generating and supplying a regulated negative potential to control gates of selected memory cells via wordlines in an array of flash EEPROM memory cells during flash erasure includes charge pumping means (12) formed of a plurality of charge pump stages (401-404) for generating a high negative voltage, and cancellation means coupled to each stage of the charge pump means for effectively canceling out threshold voltage drops in the charge pump means. A regulator means (16) responsive to the high negative voltage and a reference potential is provided for generating the regulated negative potential so that it is independent of an external supply potential (VCC). 
Advanced Micro Devices, Inc.
H G G
H02M G11C G11C
inventional inventional inventional
Chung K. Michael A. Antonio Lee E. Johnny C.
Chang Van Buskirk Montalvo Cleveland Chen