Patent ID: 6870784
Filing Date: 2005-03-22
Classification: G11C

Abstract:
1. An integrated charge sensing circuit for a resistive memory device comprising: a digit line coupled to a first capacitor; a comparator coupled to said digit line for determining if a voltage on said digit line has exceeded a predetermined threshold voltage level, said comparator having an output which switches between a first state when said voltage on said first capacitor exceeds said predetermined threshold voltage level and a second state when said voltage on said first capacitor is less than said predetermined threshold voltage level; a second capacitor which is alternately connected and disconnected from said digit line based upon said output of said comparator, said second capacitor being connected to said digit line when said output of said comparator is in said first state, said second capacitor being disconnected from said digit line when said output of said comparator is in a second state; and a counter for counting a number of times said comparator switches to said first state.