Texas Instruments Corporation

Kenneth L Arcudia

Marco Corsi

Roy Clifton Jones, Iii

Wayne Tien-Feng Chen

Kevin R Fugate

Dan Mavencamp

The circuit includes: a transistor ; and a switch coupled to a backgate of the transistor for switching between a power supply node and current-path node of the transistor to prevent a voltage on the backgate from dropping below the voltage on the current-path node.

Eliminating power-down popping in audio power amplifiers

A Class-D switching amplifier (,) having a ternary mode of operation. Signal processing (,) is provided to eliminate the potential of crosstalk within one channel by introducing a time delay into the system. A susceptible crosstalk point is moved away from a zero-crossing point to a higher power level, which is advantageous in low-end audio applications. A time delay is introduced to one ramp signal (RAMPB) in the first implementation (,), and an in-sync generator (,) is utilized in another implementation (,) using offset switching in the comparitors (,) to create the time delay (&Dgr;t).

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Ridgeland, MS, United States of America

Kenneth L Arcudia