COMBINED TRACKING OF WLL AND VPP WITH LOW THRESHOLD VOLTAGE IN DRAM ARRAY

摘要

In generating first and second voltages (VPP and WLL) for respectively activating and deactivating transistors of a DRAM array that transfer charge to cells of the DRAM array, the second voltage can be lowered to compensate for a threshold voltage (Vt) that is lower than a nominal threshold voltage value (VtNOM). Furthermore, the first voltage is tracked together with the second voltage in order to maintain a generally constant voltage swing (VSW) therebetween, thereby advantageously avoiding damage to the gate oxides in the wordline driver circuits (11, 12).