Apparatus and method for improving common mode noise rejection in pseudo- differential sense amplifiers

摘要

A pseudo-differential sense amplifier with improved common mode noise rejection is disclosed. The sense amplifier is connected to a memory cell via an array path and generates an output signal indicative of the state of the memory cell. The sense amplifier includes an array load device connected via an array node to the array path, a reference load device connected via a reference node to a reference path, a differential stage having a first input connected to the reference node, a second input connected to the array node and an output generating the output signal. The sense amplifier further includes a balancing device, connected to the reference node, for compensating a change in signal, caused by a noise event, at the array node and, thus reducing a delay in the response of the sense amplifier when a transition in the state of the cell occurs.