Top layers of metal for high performance IC's
First Claim
Patent Images
1. An integrated circuit chip comprising:
- a silicon substrate;
multiple devices in and on said silicon substrate;
a first dielectric layer over said silicon substrate;
a first metallization structure over said first dielectric layer, wherein said first metallization structure is connected to said multiple devices, and wherein said first metallization structure comprises a first metal layer and a second metal layer over said first metal layer;
a second dielectric layer between said first and second metal layers;
a passivation layer over said first metallization structure and over said first and second dielectric layers, wherein said passivation layer comprises a topmost nitride layer of said integrated circuit chip and a topmost oxide layer of said integrated circuit chip; and
a second metallization structure over said passivation layer, wherein said second metallization structure comprises a ground plane and a signal line at a same horizontal level, wherein said signal line is separate from and enclosed by said ground plane.
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Abstract
A method of closely interconnecting integrated circuits contained within a semiconductor wafer to electrical circuits surrounding the semiconductor wafer. Electrical interconnects are held to a minimum in length by making efficient use of polyimide or polymer as an inter-metal dielectric thus enabling the integration of very small integrated circuits within a larger circuit environment at a minimum cost in electrical circuit performance.
197 Citations
21 Claims
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1. An integrated circuit chip comprising:
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a silicon substrate; multiple devices in and on said silicon substrate; a first dielectric layer over said silicon substrate; a first metallization structure over said first dielectric layer, wherein said first metallization structure is connected to said multiple devices, and wherein said first metallization structure comprises a first metal layer and a second metal layer over said first metal layer; a second dielectric layer between said first and second metal layers; a passivation layer over said first metallization structure and over said first and second dielectric layers, wherein said passivation layer comprises a topmost nitride layer of said integrated circuit chip and a topmost oxide layer of said integrated circuit chip; and a second metallization structure over said passivation layer, wherein said second metallization structure comprises a ground plane and a signal line at a same horizontal level, wherein said signal line is separate from and enclosed by said ground plane. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit chip comprising:
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a silicon substrate; multiple devices in and on said silicon substrate; a first dielectric layer over said silicon substrate; a first metallization structure over said first dielectric layer, wherein said first metallization structure is connected to said multiple devices, and wherein said first metallization structure comprises a first metal layer and a second metal layer over said first metal layer; a second dielectric layer between said first and second metal layers; a passivation layer over said first metallization structure and over said first and second dielectric layers, wherein said passivation layer comprises a topmost nitride layer of said integrated circuit chip and a topmost oxide layer of said integrated circuit chip; and a second metallization structure over said passivation layer, wherein said second metallization structure comprises a ground metal and a signal line at a same horizontal level, wherein said ground metal is along both sides of said signal line and separate from said signal line. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An integrated circuit chip comprising:
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a silicon substrate; multiple devices in and on said silicon substrate; a first dielectric layer over said silicon substrate; a first metallization structure over said first dielectric layer, wherein said first metallization structure is connected to said multiple devices, and wherein said first metallization structure comprises a first metal layer and a second metal layer over said first metal layer; a second dielectric layer between said first and second metal layers; a passivation layer over said first metallization structure and over said first and second dielectric layers, wherein said passivation layer comprises a topmost nitride layer of said integrated circuit chip and a topmost oxide layer of said integrated circuit chip; and a second metallization structure over said passivation layer, wherein said second metallization structure comprises a ground plane and a contact point at a same horizontal level, wherein said contact point is separate from and enclosed by said ground plane, wherein said second metallization structure further comprises a signal interconnect passing vertically between layers through said contact point. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification