Andrew D Ingraham

Title: The Innovations of Andrew D. Ingraham

Introduction

Andrew D. Ingraham is a notable inventor based in Acton, MA (US). He has made significant contributions to the field of data transmission, holding a total of 3 patents. His work focuses on methods and apparatuses that enhance the accuracy and efficiency of data transfer between subsystems.

Latest Patents

One of Ingraham's latest patents is a method and apparatus for stabilized data transmission. This invention allows for accurate data transmission between two subsystems in a synchronous system, even when the clock skew or propagation delay exceeds one clock cycle time. The system initializes both the source and destination subsystems to ensure synchronous operation. The source subsystem transmits data along with a forwarded clock to the destination subsystem. A delay device introduces a one-half cycle delay into the forwarded clock timing. Data is captured in three state devices arranged in parallel, which eliminates minimum delay requirements and expands data valid time. The captured data is then aligned with the destination subsystem's clock by controlling a multiplexer that selects the appropriate signal for input into a second state device. This process ensures that the received data is synchronized with the destination subsystem's clock.

Another embodiment of his invention involves loading data into N state devices in the sending subsystem while the receiver recovers data from these devices using an N input multiplexer. This innovative approach allows for the forwarding of a clock signal from the sending subsystem along with a data vector of N state signals, which are captured by a pair of state devices on the rising and falling edges of the forwarded clock. A further embodiment achieves double bandwidth by forwarding two clock signals.

Career Highlights

Andrew D. Ingraham has worked at Digital Equipment Corporation, where he has been able to apply his innovative ideas in practical settings. His contributions have significantly impacted the field of data transmission technology.

Collaborations

Ingraham has collaborated with notable coworkers such as William A. Samaras and David J. Sager, further enhancing the innovative environment at Digital Equipment Corporation.

Conclusion

Andrew D. Ingraham's work in data transmission has led to significant advancements in the field. His patents reflect a deep understanding of synchronization and data integrity, making him a valuable contributor to technology.