Circuit and method for reading a resistive switching device in an array

Abstract

A read circuit for sensing a resistance state of a resistive switching device in a crosspoint array utilizes an equipotential preamplifier connected to a selected column line of the resistive switching device in the array. The equipotential preamplifier delivers a sense current while maintaining the selected column line at a reference voltage near a biasing voltage applied to unselected row lines of the array. The read circuit has a reference current source for generating a sense reference current, and a current comparator connected to evaluate the sense current delivered by the equipotential preamplifier against the sense reference current and generating an output signal indicative of the resistance state of the resistive switching device.

Dependencies are inferred from the claim text.