Switch device and method
View Patent ↗A device is disclosed having a first Field Effect Transistor having a channel region controlled by a gate, a second Field Effect Transistor having a first channel region substantially controlled by a first gate, and a second channel region substantially controlled by a second gate. The gate of the first Field Effect Transistor and the first gate of the second Field Effect Transistor are coupled to a memory write line. The second gate of the second Field Effect Transistor receives a control signal from a memory bit cell.
1. A device comprising:
a bit cell comprising a first storage node;
a write line;
a first bit line;
a first Field Effect Transistor (FET) comprising at least one gate coupled to the memory write line, a first source/drain coupled to the first bit line, and a second source/drain coupled to the first storage node to write a logic state at the first storage node; and
a second FET comprising a first gate, a second gate coupled to receive a first control signal from the bit cell, a first channel region substantially controlled by the first gate, a second channel region substantially controlled by the second gate, a first source/drain coupled to the first bit line, and a second source/drain coupled to the second source/drain of the first FET, first FET and the second FET operable to communicate logic state information at the first bit line to the first storage node to write the logic state at bit cell.
2. The device of claim 1 , wherein the first control signal is a feedback signal based upon a state of the bit cell.
3. The device of claim 1 , wherein the second gate of the second FET is coupled to the first storage node of the bit cell to receive the first control signal.
4. The electronic device as in claim 3 , wherein the first and second FETs are FinFETs.
5. The device of claim 1 , further comprising:
a third FET comprising at least one gate coupled to the memory write line; and
a fourth FET comprising a first gate coupled to the memory write line, a second gate coupled to receive a second control signal from the bit cell, a first channel region substantially controlled by the first gate, a second channel region substantially controlled by the second gate, a first source drain coupled to a second bit line, and a second source/drain coupled to a second storage node of the bit cell, the third FET and the fourth FET operable to communicate logic state information at the second bit line to the second storage node.
6. The electronic device as in claim 5 , wherein the bit cell further comprises a first pull-up transistor to pull up the first storage node, a first pull-down transistor to pull down the first storage node, a second pull-up transistor to pull up the second storage node, and a second pull-down transistor to pull down the second storage node.
7. The electronic device as in claim 6 , wherein the first, second, third, and fourth FETs are FinFETs.
8. The electronic device as in claim 7 , wherein the first and second pull-up transistors and the first and second pull-down transistors are FinFETs.
9. The electronic device as in claim 1 , wherein the first and second FETs are FinFETs.
10. A method for controlling a memory cell comprising:
receiving a first control signal at a first Field Effect Transistor (FET) comprising a source/drain and at a second FET comprising a source/drain connected to the source/drain of the first FET, wherein the control signal is indicative of a memory read or write operation;
receiving a second control signal at the second FET to bias the second FET based upon a state of a first storage node of a bit cell; and
the first FET and the second FET operable to communicate logic state information at a first bit line to the first storage node by passing a current through the first and second FETs indicative of the logic state being written to the first storage node of the bit cell, wherein the current is based upon the first control signal and the second control signal.
11. The method for controlling the memory cell of claim 10 , wherein the state of the first storage node is representative of a data bit stored at the memory cell.
12. The method for controlling the memory cell of claim 10 , further comprising:
receiving the first control signal at a third FET and at a fourth FET;
receiving a third control signal at the fourth FET to bias the fourth FET based upon a state of a second storage node of the bit cell; and
the third FET and the fourth FET operable to communicate logic state information at a second bit line to the second storage node by passing a current through the third and fourth FETs indicative of the logic state being written to the second storage node of the bit cell based upon the first control signal and the third control signal.
13. The method for controlling the memory cell of claim 12 , wherein the current through the third and fourth FET represents information complementary to information represented by the current through the first and second FET.
14. A method for controlling a memory cell comprising:
receiving a first control signal at a first Field Effect Transistor (FET) and at a second FET, wherein the control signal is indicative of a memory read or write operation;
receiving a second control signal at the second FET to bias the second FET based upon a state of a bit cell; and
passing a current through the first and second FETs representative of a logic state being read from, or written to, the bit cell, wherein the current is based upon the first control signal and the second control signal;
receiving the first control signal at a third FET and at a fourth FET;
receiving a third control signal at the fourth FET to bias the fourth FET based upon the state of the bit cell; and
passing a current through the third and fourth FETs representative of the logic state being read from, or written to the bit cell based upon the first control signal and the third control signal.
15. The device of claim 1 , wherein the first source/drain of the second FET is connected to the first source/drain of the first FET.
16. The device of claim 1 , wherein the second gate of the second FET is connected to the second source/drain of the second FET.
17. A device comprising:
a bit cell comprising a first storage node;
a write line;
a first bit line;
a first Field Effect Transistor (FET) comprising a channel region comprising at least one gate coupled to the memory write line, a first source/drain coupled to the first bit line, and a second source/drain coupled to the first storage node to write a logic state at the first storage node;
a second FET comprising a first gate, a second gate coupled to receive a first control signal from the bit cell, a first channel region substantially controlled by the first gate, a second channel region substantially controlled by the second gate, a first source/drain coupled to the first bit line, and a second source/drain coupled to the first storage node to write a logic state at the first storage node;
a third FET comprising at least one gate coupled to the memory write line; and
a fourth FET comprising a first gate coupled to the memory write line, a second gate coupled to receive a second control signal from the bit cell, a first channel region substantially controlled by the first gate, a second channel region substantially controlled by the second gate, a first source drain coupled to a second bit line, and a second source/drain coupled to a second storage node of the bit cell to write a logic state at the first storage node.
18. The electronic device as in claim 17 , wherein the bit cell further comprises a first pull-up transistor to pull up the first storage node, a first pull-down transistor to pull down the first storage node, a second pull-up transistor to pull up the second storage node, and a second pull-down transistor to pull down the second storage node.
19. The electronic device as in claim 18 , wherein the first, second, third, and fourth FETs are FinFETs.
20. The electronic device as in claim 19 , wherein the first and second pull-up transistors and the first and second pull-down transistors are FinFETs.