Jane Kehoe

US Patent:

60582588, May 2, 2000

Filed:

Oct 28, 1997

Appl. No.:

8/959208

Inventors:

Jane Grace Kehoe Cullum - Yorktown Heights NY
Albert Emil Ruehli - Chappaqua NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1710
G06F 1750

US Classification:

39550023

Abstract:

A method is provided for analyzing stability and passivity of physical systems. A physical system having time delays is represented as a linear circuit model. The linear circuit model is transformed into a corresponding transform domain circuit model. Sensitivity analysis is applied to the transform domain circuit model for generating information indicative of the stability or the passivity of the physical system having the time delays. A graphical representation may be created of the information indicative of the stability or passivity of the physical system having the time delays.

US Patent:

61889741, Feb 13, 2001

Filed:

Mar 23, 1998

Appl. No.:

9/046229

Inventors:

Jane Grace Kehoe Cullum - Yorktown Heights NY
Albert Emil Ruehli - Chappaqua NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06G 719
G06F 1750

US Classification:

703 14

Abstract:

A method comprising a computational procedure for obtaining reduced-order models of partial element equivalent circuit (PEEC) models of very large scale integrated (VLSI) interconnects. The methodology is not limited to PEEC applications, and can be used for generating reduced-order models of other systems which can be modeled with linear, time-invariant systems of ordinary differential equations with time delays.