Method for De-embedding Device Measurements

• US 20100256955A1
• Filed: 04/06/2009
• Published: 10/07/2010
• Est. Priority Date: 04/06/2009
• Status: Active Grant

• Current Assignee: Teledyne LeCroy, Inc. (Teledyne Technologies Incorporated)
• Original Assignee: Lecroy Corporation (Teledyne Technologies Incorporated)
• Inventors: Pupalaikis, Peter J., Doshi, Kaviyesh
• Granted Patent: US 8,566,058 B2
• Time in Patent Office: Days
• US Class Current: 702/189
• CPC Class Codes: G01R 27/32 in circuits having distributed constants , e.g. having very long conductors or involving high frequencies
• CPC Class Codes: G01R 35/00 Testing or calibrating of apparatus covered by the other groups of this subclass

Abstract

A method is provided for de-embedding measurements from a given network containing mixtures of devices with known and unknown S-parameters given a description of the network and the known S-parameters of the overall system.

Claims

1. A method for de-embedding at least one device whose S-parameters are unknown and including at least one unknown device port from a system having known system S-parameters at least one system port, the system comprising, in addition to the at least one device whose S-parameters are unknown, at least one device whose S-parameters are known and including at least one known device port, at least one connection between the at least one system port and the at least one known device port;

comprising the steps of;

describing the system in accordance with a system description;

converting the system description and the known S-parameters of the at least one device whose S-parameters are known to a system characteristics matrix; and

converting the system characteristics matrix and the known system S-parameters to the S-parameters of the at least one device whose S-parameters are unknown.

2. The method of claim 1, further comprising the step of converting the system description to a system description having a predefined format before conversion.

3. The method of claim 1, wherein the system comprises at least a second device whose S-parameters are unknown and including at least one unknown device port.

4. The method of claim 1, wherein the number of system ports exceeds the number of unknown device ports.

5. The method of claim 1, wherein the system comprises at least a second device whose S-parameters are known and including at least one known device port.

6. The method of claim 5, wherein a relationship between known device S-parameters is arbitrary.

7. The method of claim 1, wherein the system further comprises a node connecting at least three ports.

8. The method of claim 7, wherein the at least three ports are selected from the group of known device ports, unknown device ports, and system ports.

9. The method of claim 1, wherein the system comprises an arbitrary number of ports.

10. The method of claim 1, wherein a relationship between a total number of ports, a number of known device ports, unknown device ports, and system ports is arbitrary.

11. A computer program stored on a computer readable medium, and including instructions for de-embedding at least one device whose S-parameters are unknown and including at least one unknown device port from a system having known system S-parameters at least one system port, the system comprising, in addition to the at least one device whose S-parameters are unknown, at least one device whose S-parameters are known and including at least one known device port, at least one connection between the at least one system port and the at least one known device port;

the instructions instructing a processing element to perform the steps of;

describing the system in accordance with a system description;

converting the system description and the known S-parameters of the at least one device whose S-parameters are known to a system characteristics matrix; and

converting the system characteristics matrix and the known system S-parameters to the S-parameters of the at least one device whose S-parameters are unknown.

12. The computer program of claim 11, further comprising the step of converting the system description to a system description having a predefined format before conversion.

13. The computer program of claim 11, wherein the system comprises at least a second device whose S-parameters are unknown and including at least one unknown device port.

14. The computer program of claim 11, wherein the number of system ports exceeds the number of unknown device ports.

15. The computer program of claim 11, wherein the system comprises at least a second device whose S-parameters are known and including at least one known device port.

16. The computer program of claim 15, wherein a relationship between known device S-parameters is arbitrary.

17. The computer program of claim 11, wherein the system further comprises a node connecting at least three ports.

18. The computer program of claim 17, wherein the at least three ports are selected from the group of known device ports, unknown device ports, and system ports.

19. The computer program of claim 11, wherein the system comprises an arbitrary number of ports.

20. The computer program of claim 11, wherein a relationship between a total number of ports, a number of known device ports, unknown device ports, and system ports is arbitrary.