Practical distributed transmission line analysis

• US 5,790,835 A
• Filed: 01/02/1996
• Issued: 08/04/1998
• Est. Priority Date: 01/02/1996
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Strang, Sue Ellen, Jordan, Donald Lee, Case, Ronald Keith
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): MOHAMED, AYNI Y
• Application Number:
  US08/582,838
• Time in Patent Office: 945 Days
• Field of Search: 395/500, 364/578, 364/488-491
• US Class Current: 716/115
• CPC Class Codes: G06F 30/367 Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods

Abstract

A system and method is provided for that allows the introduction of small sections of idealized conductive elements to be placed along a transmission line. The output is a partitioned transmission line whose segments between the idealized conductive elements are analyzed via circuit simulators as a distributed parasitic network, as opposed to the widely used lumped parasitic elements approach for the entire line. The distributed parasitic network system and method provides circuit designers with a parasitic extraction tool which allows the designer to define a transmission line segment for analysis, and create sub-networks of parasitic elements across the transmission line. These elements can then be passed to existing vendor circuit simulators for parasitic analysis, the result of which are more accurate than that derived using existing extraction tools whose output is limited to only a lumped parasitic parameter along the line.

Claims

1. A method for implementing and performing distributed transmission line analysis with a transmission line analysis tool comprising the steps of:

predefining at least one unique layer in a source code file containing layer definitions to define at least one pseudo nodal point;

including a means for establishing connectivity between a transmission line and said at least one pseudo nodal point;

selecting said transmission line from a plurality of predesigned transmission lines;

placing an at least one geometric shape into said unique layer;

choosing said one of said at least one pseudo nodal points;

locating said one of said at least one pseudo nodal points onto said transmission line;

establishing connectivity between said transmission line and said one of at least one pseudo nodal point;

creating a segmented transmission line; and

performing a distributed line analysis on said segmented transmission line.

2. The method of claim 1 wherein said transmission line analysis tool is a parasitic extraction design tool.

3. The method of claim 1 wherein said transmission line comprises a substantially uniform geometric shape with two terminal points.

4. The method of claim 1 wherein said distributed line analysis comprises RLC parasitic calculations.

5. The method of claim 1 wherein said plurality of predesigned transmission lines comprise computer simulated integrated circuit transmission lines.