Mark Francisco

Title: Innovations by Mark Francisco

Introduction

Mark Francisco is an accomplished inventor based in Millstone Township, NJ (US). He holds a total of 4 patents that showcase his expertise in the field of semiconductor technology and communications systems. His innovative contributions have significantly impacted the way signals are transmitted and amplified across various frequency bands.

Latest Patents

One of his latest patents is titled "Multiport, multiband semiconductor switching and transmission circuit." This invention relates to a radio frequency (RF) multiport, multiband semiconductor and transmission circuit. Each port in the multiport circuit is linked to a second port utilizing a semiconductor switching leg. A semiconductor switching leg is biased to either transport an RF signal or to prevent its transport. In an embodiment of the present invention utilizing diodes as an active device within each semiconductor switching leg, a DC biasing signal is applied through an inlet and outlet inductor. This allows DC current to pass through the diode for biasing while preventing RF signal loss to ground. Capacitors are used for RF signal coupling and DC blocking. One embodiment of this invention is utilized with a dual band cellular/PCS device, with either band selectable for transmission and reception over either an internal antenna or an external antenna port. Transmission from the multiport, multiband semiconductor switch to one or both antenna ports is accomplished utilizing stripline with via arrays incorporated within the multi-layer printed circuit board.

Another significant patent is related to a "Communications system using multi-band amplifiers." In this system, a multi-band power amplifier is employed to increase the power level of a signal for transmission over one of multiple frequency bands. Additionally, a multi-band low noise amplifier is utilized to scale the signal level of a signal received from one of the multiple frequency bands. Each multi-band amplifier is designed such that the gain values afforded by the amplifier to the components of the communication signal within the multiple frequency bands are significantly higher than the gain values to the signal components outside those bands.

Career Highlights

Mark has worked with notable companies such as Lucent Technologies Inc. and Agere Systems. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking technologies in the field of communications.

Collaborations

Throughout his career, Mark has collaborated with talented individuals, including Myung-Kul Kim and Ralph Francis Trambarulo. These collaborations have fostered innovation and