Standard cell, semiconductor integrated circuit device of standard cell scheme and layout design method for semiconductor integrated circuit device
一种标准单元、电势的技术,应用在半导体器件、半导体/固态器件制造、电固体器件等方向,能够解决动态节点反相、电路故障、电路工作容限降低等问题
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no. 1 example
[0032] 1 is a layout showing an example of the layout of diffusion regions, metal wiring layers, etc. of a standard cell of the present invention in which a dynamic 2-input AND circuit is constructed. FIG. 2 is a circuit diagram showing the transistors constituting the dynamic 2-input AND circuit shown in the layout of FIG. 1 and the interconnections interconnecting the transistors at the same stage. FIG. 1 and FIG. 2 are equivalent, and FIG. 2 is prepared to facilitate understanding of the content of the layout of FIG. 1 .
[0033] The circuits shown in Figures 1 and 2 correspond to the previously described Figure 5 The dynamic 2-input AND circuit shown is the same. However, in FIGS. 1 and 2, shield wirings (102a, 102b) fixed to the ground potential are respectively formed on the left and right sides of the dynamic node (101) to prevent the potential of the dynamic node (101) from becoming unstable. (This will be explained below).
[0034] Conditions of the wiring layout i...
no. 2 example
[0046] image 3 is a layout showing another example of the layout of diffusion regions, metal wiring layers, etc. of a standard cell of the present invention in which a dynamic 2-input AND circuit is constructed. In this embodiment, the "shield connection" is replaced with a larger area "shield area". exist image 3 In , the same reference numerals and numerals are assigned to the same parts as in the previous figures, and the layout situation is also the same as in the previous embodiments.
[0047] exist image 3 In , the shielding region 250 made of the second metal wiring layer at the same level as the dynamic node 101 is provided. The shielding region 250 is disposed substantially over the entire area of the standard cell so as to surround the dynamic node 101 . The shielding area 250 is connected to the VDD line (103) through a plurality of contact areas. As the shielding region 250, the same material as that of the metal wiring (for example, aluminum) spreads ove...
no. 3 example
[0050] Figure 4 is a layout showing another example of the layout of diffusion regions, metal wiring layers, etc. of a standard cell of the present invention in which a dynamic 2-input AND circuit is constructed. In this embodiment, a "wiring keepout area" is used instead of a shield wiring or a shield area, whereby the same advantages as in each of the foregoing embodiments are obtained.
[0051] exist Figure 4 , the dynamic node 101 is surrounded by a region (wiring forbidden region) 300 having a predetermined area made of a wiring layer (second metal wiring layer) at the same level as the any wiring used to interconnect standard cells). Therefore, in automatic place and route, the wires (second-level routing layer) used to interconnect standard cells do not pass through the area adjacent to the dynamic node 101 (area so close that the dynamic node due to side coupling coupling to another wire can cause problems).
[0052] exist Figure 4In , the connection line 106 b...
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