Khaled M Sharaf

Title: Khaled M. Sharaf: Inventor in Fractional-N PLL Technology

Introduction

Khaled M. Sharaf is an inventor based in Richardson, Texas, whose work focuses on fractional-N phase-locked loop (PLL) synthesizers. His inventions address spur suppression and power efficiency in frequency-tracking, multiband wireless systems. He is associated with Texas Instruments Incorporated and holds 2 patents.

Latest Patents

Sharaf’s patent, “Fractional-Spurs Suppression Scheme in Frequency Tracking Multi-Band Fractional-N Phase Lock Loop,” describes circuitry that tracks the voltage-controlled oscillator’s output frequency and compensates for errors to suppress spurious sidebands, or spurs. The approach is intended for fixed-band and multiband wireless transceivers using fractional-N PLL synthesizers. The patent identifies switching time, phase noise, and reference feed-through as key PLL performance considerations.

His patent, “Low Power Fractional Pulse Generation in Frequency Tracking Multi-Band Fractional-N Phase Lock Loop,” addresses the high power consumption that can result when compensation circuitry operates at radio frequencies. It introduces a dynamic-power approach that biases the circuitry only during the fractional portion of the cycle. This technique aims to retain spur suppression while supporting faster operation, lower phase noise, and reduced power dissipation.

Career Highlights

Sharaf’s patent work centers on improving fractional-N PLL synthesizers, which are used to generate frequencies in wireless systems. His inventions explore ways to balance spur suppression, speed, phase noise, and power consumption.

Collaborations

Sharaf’s listed coworkers include Abdellatif Bellaouar and Ahmed Reda Fridi. Their shared association reflects work connected to fractional-N PLL technology and wireless transceiver applications.

Conclusion

Khaled M. Sharaf’s two patents address complementary challenges in multiband fractional-N PLL design: suppressing spurious sidebands and reducing the power required for compensation. Together, they highlight his contributions to more efficient frequency synthesis for wireless systems.