Bias and precharging circuit for use in reading EPROM cells

摘要

The bias and precharging circuit comprises a bias part and a precharging part of the bit line together with a sensing amplifier operating by comparison of the voltage of the bit line and a dummy bit line. The precharging part includes components which turn off the bias and precharging parts as soon as the sensing amplifier has read the cell subjected to precharging. The bias part includes components for amplifying the voltage unbalance produced by bias between the bit line and the dummy bit line. It provides a current-mirror to cause said voltage unbalance independently of the precharging part.