Abstract
A new sense circuit directly sensing the bitline voltage is proposed for low-voltage flash memories. A simple reference voltage generation method and a dataline switching method with matching of the stray capacitance between the dataline pairs are also proposed. A design method for the bitline clamp load transistors is described, taking bitline charging speed and process margins into account. The sense circuit was implemented in a 32-Mb flash memory fabricated with a 0.25-/spl mu/m flash memory process and successfully operated at a low voltage of 1.5 V.
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