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 Title: |
US6047117:
Diffusion-based method and apparatus for determining circuit interconnect voltage response
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Kahng, Andrew B.; Los Angeles, CA
Muddu, Sudhakar; Santa Clara, CA
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| Assignee: |
The Regents of the University of California, Oakland, CA
other patents from UNIVERSITY OF CALIFORNIA, THE REGENTS OF (599425) (approx. 4,840)
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| Published / Filed: |
2000-04-04
/ 1997-04-15
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| Application Number: |
US1997000838091
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| IPC Code: |
Advanced:
G06F 17/50;
G06G 7/48;
Core:
G06G 7/00;
more...
IPC-7:
G06G 7/48;
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| ECLA Code: |
G06F17/50C4; G06G7/48;
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| U.S. Class: |
Current:
703/013;
257/275;
Original:
395/500.34;
257/275;
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| Field of Search: |
364/488,489,490,491,578
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| Priority Number: |
| 1997-04-15 |
US1997000838091 |
| 1996-04-16 |
US1996000015515P |
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| Abstract: |
Disclosed is a diffusion-equation-based method of determining the time-domain response of an IC interconnect to an input voltage signal. Time-dependent voltage response determinations are accomplished analytically in the Laplace domain, with appropriate boundary conditions, treating the voltage response as a superposition of transmitted and reflected diffusions, based on parasitics as known quantities per unit length. The voltage response is thus determined by summing distinct reflected diffusions originating at both sides of the interconnect. The analysis proceeds on the assumption that only a selected small number of reflective components--normally only four--are required for sufficient accuracy. Voltage response from a sequence of interconnects is determined by treating the voltage response from the first interconnect as the input to the second, and repeating such looping with successive interconnects. A final inverse transform may be accomplished to express the response in the time domain. The method is limited to implementation on a computer, and an appropriately programmed computer comprises the apparatus of the invention.
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| Attorney, Agent or Firm: |
Dawes, Daniel L. ;
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| Primary / Asst. Examiners: |
Teska, Kevin J.; Do, Thuan
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| INPADOC Legal Status: |
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| Parent Case: |
CROSS-REFERENCE TO PRIOR APPLICATIONS
This is a continuation-in-part of a provisional patent application (hereinafter referred to as the "Provisional Application"), Serial No. 60/015,515, entitled "Diffusion-Based Simulation of Voltage Response on Interconnects", filed on Apr. 16, 1996 in the name of the identical inventors as identified in respect to the present application and assigned to the same entity as is the assignee of the present application and of any patents issuing hereon.
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| Family: |
None
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First Claim:
Show all 10 claims |
We claim:
1. A computer-implemented simulation method for determining the response to an input signal of a continuous and distributed transmission line having an impedance, comprising:
- determining applicable boundary conditions to represent said transmission line;
- introducing applicable impedances;
- providing a representation of the input signal; and
- applying specified solutions to a diffusion equation to said input signal representation, impedances and boundary conditions, to determine said response, wherein applying specified solutions comprises:
- determining a time-domain response of a semi-infinite RC line for step and ramp inputs;
- determining a time-domain response for a finite RC line with general load and source impedances by summing distinct diffusions starting at both ends of the finite RC line, the finite RC line have a source and load end of the line; and
- recursively determining higher order diffusion components due to reflections at the source and load ends of the finite RC line.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
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