Gardena, CA (February 16, 2004) -- Intusoft announced today that Dr. R. David Middlebrook will present a seminar on his General Feedback Theorem (GFT) at the 2004 APEC Conference, February 22, 2004. The session is entitled, "Design-Oriented Feedback Analysis-A Final Solution." He will also be part of the Intusoft booth at the exposition tradeshow, February 23-25, demonstrating his GFT application on popular analog circuit topologies.

The three-hour tutorial is a culmination of design-oriented analysis approaches presented from five previous APEC Seminars. Feedback systems are usually designed with the familiar single-loop block diagram in mind. Various non-idealities, such as unavoidable minor loops and direct forward transmission, make the single-loop block diagram progressively less useful, especially at higher frequencies. The GFT defines a "natural" block diagram model that is identical in format to the single-loop model that is conventionally assumed, thus providing a desirable link between general feedback theory and a detailed circuit diagram analyzed in terms of factored pole-zero transfer functions.

The GFT is computer friendly, and emphasis is on the numerical and graphical results obtained by use of Intusoft's ICAP/4 SPICE circuit simulation offerings. The GFT is advantageous for designs such as integrated circuits, switchmode power supply and feedback circuitry where the analysis of loop characteristics is required, but without breaking the loop, consequently having to reestablish the design's operating point.

Dr. Middlebrook will be in Intusoft's booth #421, where he'll be demonstrating the software on Intusoft's ICAP/4 analog and mixed-signal SPICE simulator. ICAP/4 furnishes all combinations of single and dual injection GFT elements using 28 special models, 5 GFT simulation templates and 35 example drawings. The drawings also include hierarchical topologies used to make the models. Dr. Middlebrook authored the GFT manual, which includes all associated GFT equations. It also walks you through several example circuits, which are part of Intusoft's ICAP/4 demo CD web download at www.intusoft.com.

Dr. R. David Middlebrook is Professor Emeritus of Electrical Engineering at the California Institute of Technology, USA, and a well-known author and lecturer. He is a Fellow of the IEEE and a Fellow of the IEE (UK). He founded the Power Electronics Group at Caltech in 1970. His primary thrust today is educating students and system designers in Design-Oriented Analysis and Measurement techniques.