The present invention relates to a closed loop class-D amplifier. The amplifier comprises a feedback arrangement with a low frequency path and a high frequency path. The high frequency path is used to obtain a self-oscillating condition in the amplifier and may contain passive components. The low frequency path comprises a low pass filter and a waveform correction circuit that reduces the amplifier distortion. Since the waveform correction circuit is applied in a low frequency path, the waveform correction unit may be realized using e.g. operational amplifiers that need not be rated for high frequencies. This allows a class-D amplifier to be realized with improved distortion and at a low cost.
|Publication status||Published - 19 Oct 2006|