Single data line sensing scheme for TCCT-based memory cells
View Patent ↗A sensing circuit including a sense amplifier to resolve a data signal generated by a memory cell is disclosed herein. The sensing circuit includes a bit line to receive the data signal, a first pre-charge device coupled to the bit line and configured to pre-charge the bit line, a device for providing a bias coupled to the bit line and configured to provide a bias to the bit line, and a reference node configured to be at least one pre-determined level. In one embodiment the pre-determined level is equal to a low potential such as ground and in another embodiment equal to a high potential such as V DD . One or more switching devices allows for the activation or deactivation of the pre-charge device allowing to pre-charge the bit line to a certain potential and the sensing circuit quickly and accurately determines whether a logical state of ‘1’ or ‘0’ is being applied to the bit line.
1. A method of controlling a sensing circuit, the method comprising:
floating a bit line;
pre-charging a first node to a first pre-determined level;
pre-charging the bit line to a second pre-determined level;
applying a bias to the bit line; and
coupling the bit line to the first node, the first node associated with a first sense amplifier input.
2. The method of claim 1 , further comprising floating the first node.
3. The method of claim 1 , further comprising transferring a data signal from a memory cell onto the bit line.
4. The method of claim 3 , wherein the memory cell is a TCCT-based device.
5. The method of claim 3 , further comprising resolving the data signal including:
applying the data signal from the bit line to the first node;
decoupling the bit line and the first node; and
determining a logical value in which the data signal represents.
6. The method of claim 5 , further comprising enabling operation of a sense amplifier.
7. The method of claim 1 , wherein the coupling of the bit line to the first node is approximately near or prior in time to the application of the data signal from the bit line to the first node.
8. The method of claim 1 , the method further comprising:
floating a reference node;
pre-charging a second node to a third pre-determined level;
pre-charging the bit line to a fourth pre-determined level; and
coupling the reference node to the second node, the second node associated with a second sense amplifier input.
9. The method of claim 8 , further comprising floating the second node.
10. The method of claim 9 , further comprising transferring a reference signal from the reference node onto the bit line.
11. The method of claim 10 , further comprising:
applying the reference signal from the reference node to the second node; and
decoupling the reference node and the second node.
12. The method of claim 8 , wherein the first, the second, the third and the fourth pre-determined levels are equivalent to ground.
13. The method of claim 8 , wherein at least one of the first, the second, the third and the fourth pre-determined levels is substantially equivalent to power supply potential.