READER FOR EPROM MEMORY CELL HAVING OPERATION FIELD INDEPENDENT FROM JUMP OF THRESHOLD TO CELL NOT WRITTEN OF WRITTEN CELL

摘要

PURPOSE: To hold a gate-source voltage at a specific constant value by using the reading device which is independent of the threshold value jump of the cell where the operation field is written. CONSTITUTION: This device is equipped with a source bias generator 4 which holds the voltage between the gate and source of an EPROM cell 2 constant by applying a source voltage varying linearly together with a source voltage to the EPROM cell 2 during a period of a read step.