Tech Library

A recent publication uses a difficult design example to show that fuzzy logic might have advantages when compared with classical compensators. However, the following paper shows that through the exploitation of the classical design, simple adaptive control methods can further improve performance and maintain it in changing environments.

As published in the Journal of Guidance, Control and Dynamics, July-August 2005

Recent publications have shown that under some conditions continuous linear time-invariant systems become strictly positive real with constant feedback. This paper expands the applicability of this result to discrete linear systems. The paper shows the sufficient conditions that allow a discrete system to become stable and strictly passive via static (constant or nonstationary) output feedback.

As presented at the IFAC World Congress, Prague

Simple direct adaptive control systems have been successfully implemented for over two decades. This paper will expand the feasibility of discrete simple adaptive control methodology to include any desired input commands and almost all real-world systems. The proofs of stability are also rigorously revised to solve the ultimate adaptive gain values question that has remained open until now.

As presented at the IFAC World Congress, Prague

The feasibility of nonlinear and adaptive control methodologies in multivariable linear time-invariant systems has apparently been limited by the standard strictly positive realness conditions.

A recent paper has managed to mitigate the symmetry condition. This paper extends the previous results.

K&S Technical Report

(English & Mandarin) Mishandling bonding wire products - from unpacking the boxes through handling on the production floor - continues to cause the majority of issues related to machine stoppages and wire bonding performance.

An animated look at the ball bonding process.

An introduction to the process steps required for wire bonding.

Feasibility of adaptive control methodologies in multivariable linear time-invariant systems is apparently limited by standard strictly positive realness conditions.

This paper expands the applicability of the strictly positive realness conditions, demonstrates that minimum-phase systems can be made strictly positive real, and illustrates the usefulness of these extended properties with an adaptive control example.

To be published in AUTOMATICA Sept 2006

Challenges in very-fine-pitch wire bonding are not limited to wire-bonder capability alone; process control is also of great importance. Moreover, the metrology employed to judge parts quality must be very closely monitored. Additionally, site-to-site variations in both bonding and metrology can play a significant role in both perceived and true sample quality, according to a recent study.

Published in Chip Scale Review: Mar 2006

During wire bonding, process reliability plays an important role in overall device assembly cost. Reliability refers to the probability that a wire bonder will perform its required functions satisfactorily under specific conditions and within a certain time period.

Published in Circuits Assembly: Mar. 2006