Texas Instruments Corporation

Michael David Score

Roy Clifton Jones, Iii

Marco Corsi

Wayne T Chen

Wayne Tien-Feng Chen

Paras M Dagli

A ternary modulation scheme for filterless switching amplifiers with reduced EMI reduces the common mode component of the signal by allowing only one state with zero differential voltage across the load to exist. The ternary modulation scheme is more efficient than the quaternary modulation scheme when applied to class-D filterless switching amplifiers since the gates of the power MOSFETs are being charged and discharged at only a small duty cycle instead of 50% duty cycle.

Modulation scheme for filterless switching amplifiers with reduced EMI

A Class-D switching amplifier (,) having a terinary modulation scheme implemented in an H-bridge configuration. The present invention has four states of operation, and achieves increased efficiency and reduced cost by delivering current to the load only when needed, and once delivered, maintaining the current. The Class-D switching amplifier eliminates the need for post amplifier filters.

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Richardson, TX, United States of America

Michael David Score