Modeling the skin effect using efficient conduction mode techniques

• US 8,225,266 B2
• Filed: 09/19/2011
• Issued: 07/17/2012
• Est. Priority Date: 05/04/2007
• Status: Active Grant

• Current Assignee: Siemens Industry Software Limited (Siemens AG)
• Original Assignee: Mentor Graphics Corporation (Siemens AG)
• Inventors: Suaya, Roberto, Ortiz, Salvador
• Primary Examiner(s): LEVIN, NAUM B
• Application Number:
  US13/235,934
• Publication Number:
  US 20120011485A1
• Time in Patent Office: 302 Days
• Field of Search: 716/132, 716/136, 703/2, 703/14
• US Class Current: 716/132
• CPC Class Codes: G06F 2119/06 Power analysis or power optimisation
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30
• 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

Described herein are embodiments of methods for extracting various high frequency parameters for a circuit design. In one exemplary embodiment, circuit design information indicating at least a geometric layout of conductors in the circuit design and a desired frequency of operation for the circuit design is received. Conduction modes representing distribution functions for currents in the conductors at the desired frequency of operation are defined. A conduction mode matrix including matrix elements based on the defined conduction modes is generated. Values for one or more matrix elements are computed by decomposing integrands for calculating the matrix elements into simplified terms that are less computationally intensive than the integrands and computing the values of the simplified terms. The values for the one or more matrix elements can be stored (e.g., on one or more computer-readable media).

Claims

1. One or more non-transitory computer-readable storage media storing computer-executable instructions for causing a computer to perform a method, the method comprising:

loading circuit design information, the circuit design information indicating at least a geometric layout of conductors in a circuit design and a desired frequency of operation for the circuit design;

defining conduction modes representing distribution functions for currents in the conductors at the desired frequency of operation;

generating a conduction mode matrix, the conduction mode matrix including matrix elements based on the defined conduction modes, the matrix elements comprising matrix elements corresponding to same conductor integrands and matrix elements corresponding to different conductor integrands;

computing values for one or more of the matrix elements corresponding to same conductor integrands using a first set of terms;

computing values for one or more of the matrix elements corresponding to different conductor integrands using a second set of terms, the second set of terms being different than the first set of terms; and

storing the values for the one or more of the matrix elements corresponding to same conductor integrands and the values for the one or more of the matrix elements corresponding to different conductor integrands.

2. The one or more non-transitory computer-readable storage media of claim 1, wherein the method further comprises computing impedance values for each of the conductors by solving a matrix equation that includes the conduction mode matrix.

3. The one or more non-transitory computer-readable storage media of claim 1, wherein the first set of terms comprises terms that result from decomposing the same conductor integrands into approximations.

4. The one or more non-transitory computer-readable storage media of claim 1, wherein the second set of terms comprises terms that result from decomposing the different conductor integrands into approximations.

5. The one or more non-transitory computer-readable storage media of claim 1, wherein the first set of terms includes one or more terms based on Gaussian quadrature rules, one or more terms derived by applying a polar coordinate system, or one or more terms corresponding to a polynomial interpolation.

6. The one or more non-transitory computer-readable storage media of claim 1, wherein the second set of terms includes one or more terms based on Gaussian quadrature rules, one or more terms corresponding to Taylor expansions, or one or more terms corresponding to a polynomial interpolation.

7. The one or more non-transitory computer-readable storage media of claim 1, wherein the method further comprises assigning at least some of the computed values for the one or more of the matrix elements corresponding to same conductor integrands to other matrix elements based on conduction mode symmetries.

8. A method, comprising:

with a computer,

loading circuit design information, the circuit design information indicating at least a geometric layout of conductors in a circuit design and a desired frequency of operation for the circuit design;

defining conduction modes representing distribution functions for currents in the conductors at the desired frequency of operation;

generating a conduction mode matrix, the conduction mode matrix including matrix elements based on the defined conduction modes, the matrix elements comprising matrix elements corresponding to same conductor integrands and matrix elements corresponding to different conductor integrands;

computing values for one or more of the matrix elements corresponding to same conductor integrands using a first set of terms;

computing values for one or more of the matrix elements corresponding to different conductor integrands using a second set of terms, the second set of terms being different than the first set of terms; and

storing the values for the one or more of the matrix elements corresponding to same conductor integrands and the values for the one or more of the matrix elements corresponding to different conductor integrands.

9. The method of claim 8, further comprising computing impedance values for each of the conductors by solving a matrix equation that includes the conduction mode matrix.

10. The method of claim 8, wherein the first set of terms comprises terms that result from decomposing the same conductor integrands into approximations.

11. The method of claim 8, wherein the second set of terms comprises terms that result from decomposing the different conductor integrands into approximations.

12. The method of claim 8, wherein the first set of terms includes one or more terms based on Gaussian quadrature rules, one or more terms derived by applying a polar coordinate system, or one or more terms corresponding to a polynomial interpolation.

13. The method of claim 8, wherein the second set of terms includes one or more terms based on Gaussian quadrature rules, one or more terms corresponding to Taylor expansions, or one or more terms corresponding to a polynomial interpolation.

14. The method of claim 8, further comprising assigning at least some of the computed values for the one or more of the matrix elements corresponding to same conductor integrands to other matrix elements based on conduction mode symmetries.

15. The method of claim 8, further comprising modifying the circuit design information based at least in part on impedance values computed from one or more of the stored values.

16. The method of claim 15, further comprising manufacturing a circuit using the modified circuit design.