Equivalent circuit simulation system and method for HSPICE

1. A computer system, comprising:

a central processing unit;

a storage device storing one or more programs, the one or more programs comprising:

an acquisition module configured for reading a data file corresponding to N-port network system format in a storage device, and obtaining S-parameter matrixes from an N-port network system;

a parameter check module configured for checking if all S-parameters in the S-parameter matrix satisfy passivity, and performing an interpolation algorithm to supplement S-parameters with passivity when some S-parameters not satisfy passivity;

a function generation module configured for generating numbers of pole-residue, times for recursion and a tolerant system error of a rational function that is a function for determining the S-parameters in the S-parameter matrix; and

an equivalent circuit generation module configured for generating a rational function matrix composed with S-parameters by performing a vector fitting algorithm based on the numbers of pole-residue, and generating an equivalent circuit compatible with HSPICE format based on the generated rational function matrix.

2. The computer system as claimed in claim 1 , wherein the equivalent circuit generation module is configured for determining if a root mean square of the error of the rational function matrix is less than the selected system errors, and increasing numbers of pole-residue to perform vector fitting when the system error is more than the root mean square of the rational function matrix.

3. The computer system as claimed in claim 1 , wherein the data file corresponding to the N-port network system is in Touchstone file format and stored in the storage device.

4. The computer system as claimed in claim 1 , wherein the S-parameter matrix is a divergence matrix describing relationship between an incident voltage wave and a reflective voltage wave in a high frequency circuit.

5. The computer system as claimed in claim 1 , wherein the equivalent circuit compatible with HSPICE comprises resistors and data of electronic components of a voltage-dependent current source.

6. A computer-implemented equivalent circuit simulation method for generating an equivalent circuit compatible with HSPICE format, comprising:

reading data corresponding to N-port network system data file in a storage device;

obtaining a S-parameter matrix from the N-port network system data file;

checking if all S-parameters in the S-parameter matrix satisfy passivity;

performing an interpolation algorithm to supplement S-parameters with passivity when some S-parameters in the S-parameter matrix not satisfy passivity;

determining numbers of pole-residue, times for recursion and a tolerant system error of a rational function required by the S-parameter matrix;

generating a rational function matrix composed with S-parameters by performing a vector fitting algorithm based on the numbers of pole-residue; and

generating the equivalent circuit compatible with HSPICE format based on the generated rational function matrix.

7. The computer-implemented equivalent circuit simulation method as claimed in claim 6 , further comprises steps of:

determining if a root mean square of the error of the rational function matrix is less than the selected system errors; and

increasing numbers of pole-residue to perform vector fitting when the system error is more than the root mean square of the rational function matrix.

8. The computer-implemented equivalent circuit simulation method as claimed in claim 6 , wherein the N-port network system data file is in Touchstone file format and stored in the storage device.

9. The computer-implemented equivalent circuit simulation method as claimed in claim 6 , wherein the S-parameter matrix is a divergence matrix describing relationship between an incident voltage wave and a reflective voltage wave in a high frequency circuit.

10. The computer-implemented equivalent circuit simulation method as claimed in claim 6 , wherein the equivalent circuit compatible with HSPICE comprises resistors and data of electronic components of a voltage-dependent current source.

11. A non-transitory computer-readable storage medium having stored thereon instructions that, when executed by a processor, causing the processor to perform an equivalent circuit simulation method for generating an equivalent circuit compatible with HSPICE format, wherein the method comprises:

reading data corresponding to W element format in a storage device;

obtaining a frequency-dependent matrix form the data of W element format by using interpolation algorithm;

transforming a frequency-dependent transmission matrix into a N-port network matrix describing electrical properties of a multi-input and multi-output network;

determining a range of frequency of a s-parameter by using interpolation algorithm;

determining numbers of pole-residue, times for recursion and durable maximum system errors in the equivalent circuit simulation;

producing a rational function matrix composed with s-parameters by performing a vector fitting algorithm based on the numbers of pole-residue; and

producing the equivalent circuit compatible with HSPICE format based on the generated rational function matrix.

12. The non-transitory computer-readable storage medium as claimed in claim 11 , wherein the equivalent circuit simulation method further comprising:

determining if a root mean square of the error of the rational function matrix is less than the selected system errors; and

increasing numbers of pole-residue to perform vector fitting when the system error is more than the root mean square of the error of the rational function matrix.

13. The non-transitory computer-readable storage medium as claimed in claim 11 , wherein the frequency-dependent transmission matrix is a tabular W element RLGC model comprising information of resistance, inductance, reactance, and capacitance.

14. The non-transitory computer-readable storage medium as claimed in claim 11 , wherein the N-port network matrix describing electrical properties of a multi-input and multi-output network, and connection relationship therebetween.

15. The non-transitory computer-readable storage medium as claimed in claim 11 , wherein the S-parameter matrix is a diverging matrix describing relationship between an incident voltage wave and a reflective voltage wave in a high frequency circuit.