Metal layout techniques
Various implementations described herein refer to a method. The method may include providing a metal layout for an integrated circuit, wherein the metal layout includes multiple lines associated with bitlines. The method may include inserting at least one additional line between the multiple lines and the bitlines. The method may include arranging the at least one additional line with respect to the multiple lines and the bitlines so as to reduce capacitance associated with the bitlines.
1. A method, comprising:
providing a metal layout for an integrated circuit, wherein the metal layout includes multiple lines associated with bitlines;
inserting at least one additional line between the multiple lines and the bitlines; and
arranging the at least one additional line adjacent to and extending along a length of at least one of the bitlines so as to reduce capacitance associated with the bitlines,
wherein the at least one additional line and the at least one of the bitlines are coupled to a bitline driver.
2. The method of claim 1 , wherein the multiple lines comprise metal lines that provide conductive paths that are associated with one or more of a high power supply (VCC/VDD), a low power supply (VSS), and one or more wordlines (WLs) or portions thereof.
3. The method of claim 1 , wherein the multiple lines have at least one of variable line width and variable spacing between the multiple lines.
4. The method of claim 1 , wherein the bitlines refer to complementary bitlines that include a first bitline and a second bitline that is a complement to the first bitline.
5. The method of claim 1 , wherein the at least one additional line comprises at least one additional floating line per bitline.
6. The method of claim 1 , wherein the at least one additional line refers to at least one additional assist line per bitline, and wherein the at least one additional assist line is arranged to generate series capacitance and reduce side wall capacitance of the bitlines.
7. The method of claim 1 , wherein the at least one additional line comprises at least one assist line that is disposed parallel to and in the same direction to the at least one of the bitlines, and wherein the at least one assist line is coupled to the at least one of the bitlines by a capacitor to form a coupling capacitance.
8. A method, comprising:
providing a metal layout for an integrated circuit, wherein the metal layout includes multiple lines and at least one additional line associated with bitlines, wherein the at least one additional line is disposed between the multiple lines and the bitlines;
precharging the bitlines and the at least one additional line from a low voltage state to a high voltage state; and
writing a bitcell via the bitlines by using a bitline driver to drive one bitline of the bitlines to the low voltage state, decoupling the bitline driver, and then driving the at least one additional line to the low voltage state, wherein the at least one additional line corresponds to the one bitline.
9. The method of claim 8 , wherein the multiple lines comprise metal lines that provide conductive paths that are associated with one or more of a high power supply (VCC/VDD), a low power supply (VSS), and one or more wordlines (WLs) or portions thereof.
10. The method of claim 8 , wherein the multiple lines have at least one of variable line width and variable spacing between the multiple lines.
11. The method of claim 8 , wherein the bitline driver is decoupled before driving the one or more additional lines to the low voltage state.
12. The method of claim 8 , wherein the at least one additional line refers to at least one additional assist line per bitline.
13. The method of claim 8 , wherein the at least one additional line comprises at least one floating assist line per bitline, and wherein the at least one floating assist line is disposed to overlie or underlie the bitlines.
14. The method of claim 8 , wherein the bitcell comprises a random access memory (RAM) cell having multiple transistors arranged to store multiple logic states related to the low voltage state and the high voltage state.
15. A method, comprising:
providing a metal layout with multiple lines and one or more floating assist lines associated with complementary bitlines, wherein the one or more floating assist lines are disposed between the multiple lines and the complementary bitlines;
during write operations, precharging one of the complementary bitlines and the one or more floating assist lines from a low voltage state to a high voltage state;
after precharging one of the complementary bitlines, writing a bitcell via the complementary bitlines by using a bitline driver to drive one of the complementary bitlines to the low voltage state, decoupling the bitline driver, and then driving the one or more floating assist lines to the low voltage state.
16. The method of claim 15 , wherein the multiple lines comprise metal lines that provide conductive paths that are associated with one or more of a high power supply (VCC/VDD), a low power supply (VSS), and one or more wordlines (WLs) or portions thereof.
17. The method of claim 15 , further comprising: arranging the one or more floating assist lines with respect to the multiple lines and the bitlines so as to reduce capacitance associated with the bitlines.
18. The method of claim 15 , wherein the bitline driver is decoupled before driving the one or more floating assist lines to the low voltage state.
19. The method of claim 15 , wherein the one or more floating assist lines comprise at least one floating assist line per bitline, and wherein the at least one floating assist line is disposed to overlie or underlie the bitlines.
20. The method of claim 15 , wherein the bitcell comprises a random access memory (RAM) cell having multiple transistors arranged to store multiple logic states related to the low voltage state and the high voltage state.
21. A method, comprising:
providing a metal layout for an integrated circuit, wherein the metal layout includes multiple lines and at least one additional line associated with bitlines, wherein the at least one additional line is disposed between the multiple lines and the bitlines;
precharging the bitlines and the at least one additional line from a low voltage state to a high voltage state; and
writing a bitcell via the bitlines by using a bitline driver to drive one bitline of the bitlines to the low voltage state, decoupling a high power supply (VCC/VDD) driver, and then driving the at least one additional line to the low voltage state, wherein the at least one additional line corresponds to the one bitline.
22. The method of claim 21 , further comprising decoupling the bitline driver along with decoupling the high power supply (VCC/VDD) driver.