Distributed cascode current source for RRAM set current limitation
First Claim
Patent Images
1. An apparatus, comprising:
- a memory cell array comprising a plurality of columns, wherein each column comprises;
a source line,a plurality of memory cells, wherein each of the memory cells comprises a memory element coupled to the source line through a word line select transistor, anda bit line, wherein the bit line runs parallel to the source line;
a column selector coupled to the source lines;
a current limiting device coupled between the source lines and a supply voltage, the current limiting device to operate in a constant current mode during an access operation of the memory cells; and
a diode configured stack of transistors, wherein a first transistor of the stack is selectively coupled to one of the gates of the word line select transistors, and a second transistor of the stack is coupled to the current limiting device.
2 Assignments
0 Petitions
Accused Products
Abstract
In one example, a current limited device is coupled between a source line of a memory cell array and a supply voltage, and configured to operate in a constant current mode during an access operation of a memory cell.
-
Citations
15 Claims
-
1. An apparatus, comprising:
-
a memory cell array comprising a plurality of columns, wherein each column comprises; a source line, a plurality of memory cells, wherein each of the memory cells comprises a memory element coupled to the source line through a word line select transistor, and a bit line, wherein the bit line runs parallel to the source line; a column selector coupled to the source lines; a current limiting device coupled between the source lines and a supply voltage, the current limiting device to operate in a constant current mode during an access operation of the memory cells; and a diode configured stack of transistors, wherein a first transistor of the stack is selectively coupled to one of the gates of the word line select transistors, and a second transistor of the stack is coupled to the current limiting device. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An apparatus, comprising:
-
a memory cell array comprising a plurality of columns, wherein each column comprises; a source line, a plurality of memory cells, wherein each of the memory cells comprises a memory element coupled to the source line through a word line select transistor, a bit line, wherein the bit line runs parallel to the source line, and a current limiting device coupled between the source line and a supply voltage, the current limiting device to operate in a constant current mode during an access operation of the memory cells of the column; a column selector coupled to the source lines; and a diode configured stack of transistors, wherein a first transistor of the stack is selectively coupled to one of the gates of the word line select transistors, and a second transistor of the stack is coupled to the current limiting device. - View Dependent Claims (7, 8, 9, 10)
-
-
11. An apparatus, comprising:
-
a memory cell array comprising a plurality of rows, wherein each row comprises; a source line, a plurality of memory cells, wherein each of the memory cells comprises a memory element coupled to the source line through a word line select transistor, a word line, wherein the word line runs parallel to the source line, and a current limiting device coupled between the source line and a supply voltage, the current limiting device to operate in a constant current mode during an access operation of the memory cells of the row; a row selector coupled to the source lines; and a diode configured stack of transistors, wherein a first transistor of the stack is selectively coupled to one of the gates of the word line select transistors, and a second transistor of the stack is coupled to the current limiting device. - View Dependent Claims (12, 13, 14, 15)
-
Specification