Sense amplifier utilizing a balancing resistor

摘要

A cross-coupled sense amplifier includes a voltage-compensating balancing resistor serially connected between the drain of one of the P-channel transistors in the sense amplifier and the corresponding sensing/bit line node. The value of the balancing resistor is optimized so that the voltage imbalance between the P-channel transistor is minimized and sense amplifier sensitivity is maximized. A balancing resistor can also be placed in the N-channel transistors in the sense amplifier if desired. The balancing resistor in a typical application is about 100 to 200 ohms and fabricated from polysilicon.