Patent ID: 8908887

Claim:
An apparatus for providing an audio signal to drive a speaker system, said apparatus comprising: a first audio channel having a first class-D amplifier for receiving an input signal, and a first reconstruction filter for receiving an output from said first class-D amplifier and reconstructing therefrom an output audio signal for driving said speaker system, said first reconstruction filter including a first planar inductor; a second audio channel having a second class-D amplifier for receiving an input audio signal, and a second reconstruction filter for receiving an output from said second class-D amplifier and reconstructing therefrom an output audio signal for driving said speaker system, said second reconstruction filter including a second planar inductor, said second planar inductor being magnetically coupled to said first planar inductor; and a first feedback loop for providing a signal from an output of said first reconstruction filter back to said first class-D amplifier.