Methods and apparatuses for compensating for source voltage
View Patent ↗Apparatuses and methods for compensating for source voltage are described. An example apparatus includes a source cooled to a memory cell and a read-write circuit coupled to the memory cell. The apparatus further includes a sense current generator coupled to a node or the source and to the read-write circuit, the sense current generator configured to control provision of a sense current by the read-write circuit responsive to a voltage of the node of the source.
1. An apparatus, comprising:
a sense current generator coupled to a node of a source line coupled to a memory cell, the sense current generator configured to control a sense current used to access the memory cell by sensing a current through a feedback transistor coupled to the source line via a reference resistance.
2. The apparatus of claim 1 , wherein the sense current generator further comprises an amplifier coupled to the feedback transistor and the source line, the amplifier configured to provide a bias voltage to a read/write circuit based on a feedback voltage received at the input of the amplifier.
3. The apparatus of claim 1 , further comprising a read/write circuit coupled to the memory cell.
4. The apparatus of claim 3 , wherein the sense current generator configured to control the sense current used to access the memory cell comprises the sense current generator coupled to a sense current transistor of the read write circuit and the sense current generator configured to provide a bias voltage to a gate of the sense current transistor based on the voltage of the node of the source line.
5. The apparatus of claim 4 , wherein the sense current generator is configured to provide the bias voltage to the read-write circuit responsive a memory access command.
6. The apparatus of claim 1 , further comprising a string of memory cells that includes the memory cell.
7. A method, comprising:
providing a bias voltage to a read-write circuit and to a gate of a feedback transistor having a voltage based on a feedback voltage, wherein the feedback voltage is sensed from a node between the feedback transistor and a resistance coupled to a source line; and
providing a sense current at the read-write circuit having a value based on the voltage of the bias voltage.
8. The method of claim 7 , further comprising detecting that the voltage of the source line is greater than a reference voltage.
9. The method of claim 7 , wherein providing the bias voltage to the read-write circuit comprises providing the bias voltage to a gate of a sense current transistor.
10. The method of claim 7 , further comprising activating a source line transistor to couple the source line to a reference node.
11. The method of claim 7 , further comprising detecting a value stored in a memory cell based on the sense current.
12. The method of claim 7 , further comprising receiving the feedback voltage from the feedback node.