Tripath Technology, Inc.

Guoqing Miao

Cary L Delano

A switching amplifier is described which includes an input stage having a first node associated therewith and a power stage having a second node associated therewith. An actual loop delay is defined with reference to the first and second nodes. Delay detection circuitry compares the actual loop delay to a reference loop delay. A dynamic delay line controlled by the delay detection circuitry controls the actual loop delay to correspond to the reference loop delay.

Dynamic switching frequency control for a digital switching amplifier

Methods and apparatus are described for reducing or eliminating break-before-make distortion in switching amplifiers. A switching amplifier has an input stage for generating a switching signal. Break-before-make distortion compensation circuitry alters the switching signal. Break-before-make generator circuitry generates two drive signals from the altered switching signal. A power stage includes two switches which are alternately driven by the two drive signals. Break-before-make distortion detection circuitry detects a distortion pattern at the power stage output node and controls the break-before-make distortion compensation circuitry to alter the switching signal in response to the distortion pattern detected to thereby eliminate at least some break-before-make distortion.

Break-before-make distortion compensation for a digital amplifier

An offset voltage calibration circuit for use with a digital switching amplifier. The calibration circuit includes an analog-to-digital converter for converting at least one DC offset voltage associated with the digital switching amplifier to digital offset data. A memory stores the digital offset data. Control circuitry controls the analog-to-digital converter. A digital-to-analog converter coupled to the memory receives the digital offset data and generates an offset compensation voltage for applying to an input port of the digital switching amplifier which thereby cancels at least a portion of the at least one DC offset voltage.

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Roselle Park, NJ, United States of America

Guoqing Miao