Patent ID: 9099191
Filing Date: 2015-08-04
Classification: G11C

Abstract:
1. A sensing method of a current sensing amplifier for determining a storing state of a cell of a non-volatile memory device during a read cycle, the sensing method comprising steps of: adjusting a sensing node and a reference node to a constant voltage; connecting the sensing node with a data line to receive a cell current from the cell, and connecting the reference node with a reference current source to receive a reference current from the reference current source; and when a reference voltage of the reference node reaches a preset voltage, determining a storing state of the cell according to a relationship between a sensing voltage of the sensing node and the preset voltage, wherein if the sensing voltage of the sensing node is lower than the preset voltage, the cell is in a first storing state, wherein if the sensing voltage of the sensing node is higher than the preset voltage, the cell is in a second storing state; wherein the cell current has a first current magnitude when the cell is in the first storing state, the cell current has a second current magnitude when the cell is in the second storing state, and the reference current is in a range between the first current magnitude and the second current magnitude; and wherein the cell has a first threshold voltage when the cell is in the first storing state, and the cell has a second threshold voltage when the cell is in the second storing state, the reference current source comprises a reference cell with a reference threshold voltage, and the reference threshold voltage is in a range between the first threshold voltage and the second threshold voltage.