William J Craig

Title: Innovations of William J Craig

Introduction

William J Craig is a notable inventor based in South Burlington, VT (US). He has made significant contributions to the field of electrical engineering, particularly in the development of innovative structures for voltage generation and protection.

Latest Patents

William J Craig holds 2 patents that showcase his expertise. His first patent, titled "Charge pumping structure for a substrate bias generator," describes a charge pumping structure designed for use in a substrate bias voltage generator. This invention includes a capacitor on a substrate region that couples to a first node periodic voltage signals received at a second node. The design features a first diode structure that provides a current path from the first node to the substrate, and a second diode structure that connects the first node to a reference potential, typically ground. The first diode structure incorporates a PN junction diode and an isolation ring to collect minority charge carriers, while the second diode structure may include a pocket type PN junction diode to prevent majority carriers from moving back into the substrate.

His second patent, "Twin diode overvoltage protection structure," discloses an overvoltage protection mechanism for CMOS circuits. This structure protects against overvoltage conditions while minimizing latch-up risks. It consists of a well region of opposite conductivity to the substrate, defining a pocket region with a similar conductivity type. The design includes two PN junction diodes with opposite polarity, connected to a signal line to ensure that one diode becomes forward biased if the signal line voltage exceeds power supply limits. This innovative approach prevents injected minority carriers from adversely affecting adjacent circuits.

Career Highlights

William J Craig is associated with the International Business Machines Corporation (IBM), where he has contributed to various projects and innovations in electrical engineering. His work has had a lasting impact on the development of reliable electronic systems.

Collaborations

Throughout his career, William has collaborated with notable colleagues, including Peter Edwin Cottrell and Ronald R Troutman. These collaborations have further enhanced his contributions to the field.

Conclusion

William J Craig is a distinguished inventor whose work in electrical engineering has led to significant advancements in voltage generation and protection technologies. His patents reflect a commitment to innovation and excellence in the industry.