Cirrus Logic Inc.

Jianhao Chen

John L Melanson

Xiaofan Fei

Eric Lindemann

Amar Vellanki

Wai-Shun Shum

Leyi Yin

Venugopal Choukinishi

A multi-path audio amplification system that provides an output drive signal to electromechanical output transducers provides improved undistorted headroom, reduced path switching noise, and/or improved frequency response performance. Multiple signal amplification paths receive an audio input signal and have corresponding multiple output stages that have differing output impedances. A mode selector selects an active one of the multiple signal amplification paths is selected to supply the output drive signal. Outputs of the multiple output stages are coupled to the electromechanical transducer to provide the output drive signal and at least one of the multiple signal amplification paths includes an equalization filter for filtering the audio input signal to compensate for phase or gain differences referenced from the input to the outputs of the multiple output stages due to interaction between the differing output impedances and an impedance of the electromechanical transducer.

Equalization in a multi-path audio amplifier for canceling variations due to multi-path output impedance differences

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Austin, TX, United States of America

Jianhao Chen