Patent ID: 7365585
Filing Date: 2008-04-29
Classification: H03K

Abstract:
1. A system for providing an adaptive slew rate voltage signal to a memory cell, the system comprising: a charge pump coupled to a switch, the charge pump having a charge pump current, a charge pump load capacitance, and a charge pump voltage level, wherein the charge pump drives an output node having an output node voltage level at a first slew rate for a first voltage range; a threshold voltage detection circuit coupled to a level shifter, a delay circuit, and the output node, wherein the threshold voltage detection circuit comprises a voltage divider circuit coupled to a comparator circuit; a slew rate control circuit coupled to the delay circuit, the charge pump, and the output node; and wherein the threshold voltage detection circuit generates a detection signal when the output node voltage level reaches a predetermined threshold voltage level, the detection signal communicated to the level shifter coupled to the switch to disable the charge pump and enable the slew rate control circuit to drive the output node voltage level at a second slew rate less than the first slew rate for a second voltage range.