US3974443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive line width and resistivity measuring system
Assignee: International Business Machines Corp
•
Filing: 1975-01-02
•
Granted: 1976-08-10
•
Expires: 1995-01-02
Abstract
Abstract Method and apparatus for measuring or determining characteristics, such as width and resistivity of a given conductive line, particularly a conductive line produced by integrated circuit technology. The conductive line, having a first width which is formed on an insulating medium is disposed in the vicinity of or adjacent to a second line having a second width different from the first width, which is also conductive and which is made by the same process by which the given conductive line was made. A common constant current is passed through the given conductive line and through the second line. A first voltage is measured between two points spaced apart by a given distance along the given conductive line and a second voltage is measured between two points spaced apart by the given distance along the second line. Characteristics, such as width and resistivity, of the given conductive line, as well as those of the second line, are then determined by utilizing relationships between the measured voltages and known line constants.
Inventors
- 👤 Donald Ralph Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:08
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/08; G01R31/00; G01R31/28; G01R31/2851; G01R31/2853
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
A measuring system comprising a first conductive line having a known first nominal width, a second conductive line having a known second nominal width, means for passing current of equal value through each of said lines, and means for measuring the voltage between two points on each of said lines spaced apart by equal distances to determine in relationship with said first and second nominal widths characteristics of said conductive lines.
Claim 2
Dependent Claim
71 words
A measuring system comprising a first conductive line having a known first nominal width, a second conductive line having a known second nominal width, means for passing current of equal value through each of said lines, and means for measuring the voltage between two points on each of said lines spaced apart by equal distances to determine in relationship with said first and second nominal widths characteristics of said conductive lines.
Claim 3
Dependent Claim
66 words
A measuring system as set forth in claim 1 wherein one of said characteristics is line width variation from said nominal widths derived in accordance with the relationship ##EQU7## where V 1 and V 2 are the voltages between the two points on the first and second lines, respectively, and W 1N and W 2N are the nominal width of the first and second lines, respectively.
Claim 4
Dependent Claim
87 words
A measuring system as set forth in claim 1 further comprising means for measuring current flow through said lines and wherein one of said characteristics is resistivity derived in accordance with the relationship ##EQU8## where V 1 and V 2 are the voltages between the two points on the first and second lines, respectively, W 1N and W 2N are the nominal width of the first and second lines, respectively, L is the distance between said two points and I is the current flowing through said lines.
Claim 5
Dependent Claim
23 words
A measuring system as set forth in claim 1 wherein said measuring means includes a probe pad connected to each of said points.
Claim 6
Dependent Claim
22 words
A measuring system as set forth in claim 4 wherein said lines are disposed adjacent to each other on an insulating medium.
Claim 7
Dependent Claim
35 words
A measuring system as set forth in claim 5 wherein said first nominal width is similar in size to said second nominal width and said insulating medium forms a portion of a semiconductor integrated circuit.
Claim 8
Dependent Claim
25 words
A measuring system as set forth in claim 1 wherein said means for passing current includes probe pads connected to said first and second lines.
Claim 9
Independent Claim
78 words
A method for measuring characteristics of conductive lines comprising forming a first conductive line having a known first nominal width and a second conductive line having a known second nominal width, passing equal amounts of current through said first and second conductive lines, measuring the voltage between two points on each of said lines spaced apart by equal distances and calculating characteristics of said conductive lines as relationships of the voltages with said first and second nominal widths.
Claim 10
Independent Claim
78 words
A method for measuring characteristics of conductive lines comprising forming a first conductive line having a known first nominal width and a second conductive line having a known second nominal width, passing equal amounts of current through said first and second conductive lines, measuring the voltage between two points on each of said lines spaced apart by equal distances and calculating characteristics of said conductive lines as relationships of the voltages with said first and second nominal widths.
Claim 11
Dependent Claim
65 words
A method as set forth in claim 8 wherein one of said characteristics is line width variation from said nominal widths derived in accordance with the relationship ##EQU9## where V 1 and V 2 are the voltages between the two points on the first and second lines, respectively, and W 1N and W 2N are the nominal width of the first and second lines, respectively.
Claim 12
Dependent Claim
32 words
A method as set forth in claim 8 further comprising measuring current flow through said lines and wherein one of said characteristics is resistivity derived in accordance with the relationship ##EQU10## where
Claim 13
Dependent Claim
52 words
V 1 and V 2 are the voltages between the two points on the first and second lines, respectively, W 1N and W 2N are the nominal width of the first and second lines, respectively, L is the distance between said two points and I is the current flowing through said lines.
Claim 14
Dependent Claim
52 words
V 1 and V 2 are the voltages between the two points on the first and second lines, respectively, W 1N and W 2N are the nominal width of the first and second lines, respectively, L is the distance between said two points and I is the current flowing through said lines.
References Cited (Backward Citations)
US2659861A
Cited
US2659862A
Cited
US2854626A
Cited
US3134077A
Cited
US3721897A
Cited
US3753093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |