Memory device and method
View Patent ↗A memory device and a method for compensating for a load current in the memory device. The memory device includes a plurality of I/O buffers where each I/O buffer includes an I/O write-buffer driver circuit. The I/O write-buffer driver circuit is coupled to a load current compensation circuit. Although each I/O buffer includes an I/O write-buffer circuit, a single load current compensation circuit may be coupled to several I/O write-buffer driver circuits. The load current compensation circuit generates a load compensation current for each I/O buffer circuit that is not being programmed. The load compensation current increases the load current so that a drain-side programming voltage (VPROG) drives a substantially constant load current, wherein the drain-side programming voltage is substantially independent of the number of bits being programmed.
1. A method for programming a memory device having a programming node, comprising:
providing a programming voltage to the programming node;
using the programming voltage to generate a load current;
generating a load voltage at a compensation node of the memory device;
generating an error voltage in response to the load voltage; and
changing the load current in response to the error voltage.
2. The method of claim 1 , wherein generating the error voltage includes comparing a reference voltage with the load voltage.
3. The method of claim 2 , wherein the error voltage increases the load current when the reference voltage has a greater value than the load voltage.
4. The method of claim 1 , wherein changing the load current further includes providing an enable signal at a switching terminal.
5. The method of claim 1 , wherein providing the programming voltage includes providing the programming voltage to a plurality of programming nodes.
6. The method of claim 5 , wherein providing the programming voltage includes providing the programming voltage to sixteen programming nodes.
7. The method of claim 1 , wherein changing the load current includes increasing the load current.
8. A method for regulating a programming voltage in a memory device, comprising:
generating a load current in accordance with the programming voltage; and
changing the load current in response to a programming load by applying the programming voltage to a load compensation network, wherein the load compensation network changes the load current to simulate programming a predetermined number of data bits of the memory device.
9. The method of claim 8 , wherein generating the load current further includes generating a load current in accordance with the number of data bits being programmed.
10. The method of claim 9 , wherein the number of data bits being programmed is sixteen.
11. The method of claim 8 , wherein the predetermined number of data bits is sixteen.
12. The method of claim 8 , wherein changing the load current includes generating a load compensation current through a programming load.
13. The method of claim 8 , wherein changing the load current includes:
comparing a compensation voltage signal with a reference voltage signal to generate an error voltage signal;
generating an output voltage signal in accordance with the error voltage signal; and
using the output voltage signal to change the load current.
14. The method of claim 13 , wherein using the output voltage signal to change the load current includes activating a transistor.