Company Filing History:
Years Active: 2020-2021
Title: Cristian Marcu: Innovator in Oscillator Calibration and Phase-Locked Loops
Introduction
Cristian Marcu is a notable inventor based in San Jose, California. He has made significant contributions to the field of electronics, particularly in the areas of oscillator calibration and phase-locked loops. With a total of three patents to his name, Marcu's work has had a substantial impact on the technology industry.
Latest Patents
One of Cristian Marcu's latest patents is focused on voltage-controlled oscillator calibration. This innovation involves a computer system that periodically calibrates an oscillator subsystem, which includes a voltage-controlled oscillator circuit. The system generates an oscillator signal using a code signal and performs an iterative calibration operation in response to the activation of a calibration mode. This process includes determining the value of the code signal based on the number of pulses in the oscillator signal sampled during a specific time period, along with previous values of the code signal and the slope of an error function. The goal is to maintain target accuracy while reducing the duration of the calibration operation.
Another significant patent by Marcu is related to divider control and reset for phase-locked loops. In this invention, a phase-locked loop circuit generates a clock signal using a reference signal. The circuit includes a programmable divider stage with multiple divider stages. When frequency calibration is initiated, a control circuit generates a pause signal in response to one or more of the divider stages reaching a specific logic state. This allows the programmable divider stage to hold the divider stages in that state, enhancing the efficiency of the calibration process.
Career Highlights
Cristian Marcu is currently employed at Apple Inc., where he continues to innovate and develop cutting-edge technologies. His work has been instrumental in advancing the capabilities of electronic systems, particularly in the realm of signal processing and frequency calibration.
Collaborations
Throughout his career, Marcu has collaborated with talented individuals such as Long Kong and Simone Gambini. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.
Conclusion
Cristian Marcu is a distinguished inventor whose contributions to oscillator calibration and phase-locked loops have significantly influenced the technology landscape. His innovative patents and collaborative efforts at Apple Inc. continue to drive advancements in electronic systems.