Majid M Hashemi

Title: The Innovative Contributions of Majid M Hashemi

Introduction

Majid M Hashemi is a prominent inventor based in Tempe, AZ, known for his significant contributions to the field of radio frequency integrated circuits and global positioning systems. With a total of 16 patents to his name, Hashemi has made remarkable advancements that enhance the functionality and efficiency of GPS technology.

Latest Patents

One of his latest patents is titled "GPS front end having an interface with reduced data rate." This invention involves a radio frequency integrated circuit designed for GPS applications. It mixes radio frequency GPS signals from an external source with a predetermined intermediate frequency that is less than 4f. In one embodiment, the intermediate frequency is selected to be 1.5f. An intermediate frequency filter then band-limits the intermediate frequency GPS signals, rolling off at a frequency around 2.5 MHz to achieve substantial attenuation at 3.5-4.0 MHz. An automatic gain control circuit amplifies the filtered intermediate frequency GPS signals to appropriate voltage levels. The amplified signals are then digitized by an analog-to-digital converter at a predetermined sampling rate, providing samples for baseband processing by a general-purpose microprocessor over an industry-standard serial bus.

Another notable patent is "Communications receiver with integrated IF filter and method therefor." This invention includes an IF filter and a nearby process-variant circuit formed on a common semiconductor substrate. The actual center frequency of the IF filter is determined by resistors and capacitors with imprecise values, which may not equal a nominal center frequency. The process-variant circuit includes a test resistor and test capacitor formed using the same processes as the IF filter components. In response to a test signal from the process-variant circuit and a reference signal from a process-invariant circuit, a tuning parameter for a tunable local oscillator is determined. This ensures that the local oscillation signal exhibits a frequency that, when mixed with an RF signal, yields an IF signal at the actual center frequency of the IF filter.

Career Highlights

Throughout his career, Hashemi has worked with notable companies such as National Scientific Corporation and Motorola Corporation. His experience in these organizations has contributed to his expertise in developing innovative technologies.

Collaborations

Hashemi has collaborated with esteemed colleagues, including El-Badawy Amien El-Sharawy and Saied N Tehrani