Fishing – trapping – and vermin destroying
Patent
1990-07-18
1991-05-21
Chaudhuri, Olik
Fishing, trapping, and vermin destroying
437190, 437195, 437962, H01L 2144
Patent
active
050175092
ABSTRACT:
Standoff transmission lines in an integrated circuit structure are formed by etching away or removing the portion of the dielectric layer separating the microstrip metal lines and the ground plane from the regions that are not under the lines. The microstrip lines can be fabricated by a subtractive process of etching a metal layer, an additive process of direct laser writing fine lines followed by plating up the lines or a subtractive/additive process in which a trench is etched over a nucleation layer and the wire is electrolytically deposited. Microstrip lines supported on freestanding posts of dielectric material surrounded by air gaps are produced. The average dielectric constant between the lines and ground plane is reduced, resulting in higher characteristic impedance, less crosstalk between lines, increased signal propagation velocities, and reduced wafer stress.
REFERENCES:
patent: 3769619 (1973-10-01), Ang et al.
patent: 4224361 (1980-09-01), Romankiw
patent: 4267632 (1981-05-01), Shappir
patent: 4373251 (1983-02-01), Wilting
patent: 4464459 (1984-08-01), Majima et al.
patent: 4620898 (1986-11-01), Banks et al.
patent: 4697333 (1989-10-01), Nakahara
patent: 4789645 (1988-12-01), Calviello et al.
Circuits, Interconnections, and Packaging for VLSI, by H. B. Bakoglu, 1990, pp. 10-12, 208-209 and 226-227.
Physics of Semiconductor Devices, by S. M. Sze, p. 32.
"Design and Layout of Microstrip Structures", by F. E. Gardiol, IEE Proceedings, vol. 135, Pt. II, No. 3, Jun. 1988, pp. 145-157.
Chaudhuri Olik
Griffis Andrew
Regents of the University of California
Sartorio Henry P.
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