John R Francis

Title: John R. Francis: Innovator in Amplifier Technology

Introduction

John R. Francis is a notable inventor based in Burlington, CA. He has made significant contributions to the field of electronics, particularly in amplifier technology. With a total of 5 patents to his name, his work has had a considerable impact on the industry.

Latest Patents

One of his latest patents is for a variable gain amplifier with temperature compensated gain. This innovative amplifier utilizes transistors configured to amplify a received signal, creating an amplified signal that adjusts its gain based on temperature changes. The design includes a gain control circuit that responds to a gain control signal, as well as a temperature compensation circuit with various elements. This circuit features a constant current source that generates a constant current to create a stable voltage, alongside a temperature-dependent current source that inversely relates to the amplifier's temperature. An operational amplifier is employed to compare these voltages and generate an offset signal that varies with temperature, ultimately modifying the gain control signal through a gated buffer.

Another significant patent by Francis is a phase detector for high-speed clock recovery from random binary signals. This improved phase detector effectively detects the difference between an information signal and a clock signal. The information signal is divided into multiple signals, each with a data rate that is a fraction of the original. The invention generates variable width difference pulse signals in response to the phase difference between the divided signals and the clock signal. Additionally, fixed-width reference pulse signals are created, leading to the generation of a phase error signal based on the difference pulse signals and reference pulse signals.

Career Highlights

Throughout his career, John R. Francis has worked with prominent companies such as Gennum Corporation and Macom Technology Solutions Holdings, Inc. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking technologies in the field of electronics.

Collaborations

One of his notable coworkers is Atul Krishna Gupta. Their collaboration has likely fostered innovative ideas and advancements in their respective projects.

Conclusion

John R. Francis is a distinguished inventor whose work in amplifier technology and phase detection has made a lasting impact on the electronics industry. His patents reflect a deep understanding of complex electronic systems and a commitment to innovation.