Elmer C Simmons

Title: Elmer C. Simmons: Innovator in Phase-Locked Loop Technology

Introduction

Elmer C. Simmons is a notable inventor based in Whitman, MA (US), recognized for his contributions to the field of electronics and signal processing. He holds a total of four patents, showcasing his innovative spirit and technical expertise.

Latest Patents

One of his latest patents is the "Auto-centered phase-locked loop," which describes a multi-band processing system designed to automatically tune the oscillator of a phase-locked loop to the frequency and phase of an applied input. This system incorporates an error detection circuit, a frequency controller, a scaling circuit, and a phase and frequency controller. The applied input and the oscillator output are connected to the error detection circuit, which drives a charge pump/filter circuit based on the error output. The frequency controller regulates the oscillator output frequency according to a frequency error component, while the scaling circuit adjusts the oscillator output frequency based on a system scaling signal. The phase and frequency controller fine-tunes the oscillator output frequency and phase by comparing a 1/N multiple of the oscillator output frequency to the applied input frequency.

Another significant patent is the "Data decoding circuit including phase-locked loop timing." This invention involves a data decoding circuit that receives an input signal comprising a sequence of pulses and generates a digital data output signal along with timing signals. The circuit features a phase-locked loop that produces timing signals in response to the input signal and an offset signal from a data separator circuit. The data separator generates the digital data output signal and the offset signal, which measures the correlation between the input signal and the timing signal, thus eliminating the need for a close match between the data separator circuit and the phase-locked loop.

Career Highlights

Elmer C. Simmons has made significant strides in his career while working at Digital Equipment Corporation. His work has had a lasting impact on the field of electronics, particularly in the development of phase-locked loop technologies.

Collaborations

Throughout his career, Simmons has collaborated with notable colleagues, including Michael D. Leis and Michael J. Muchnik. These collaborations have contributed to the advancement of technology in their respective fields.

Conclusion

Elmer C. Simmons is a distinguished inventor whose work in phase-locked loop technology has paved the way for advancements in electronics. His innovative patents and contributions to Digital Equipment Corporation highlight his significant