Digital amplifier and switching power supply
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United States of America Patent
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N/A
Issued Date -
Dec 14, 2006
app pub date -
Mar 15, 2006
filing date -
Mar 16, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To provide a digital amplifier and a switching power supply which are effective to realize a noise level required for a high grade and output digital amplifier and a switching power supply. In an embodiment, a noise component extraction circuit is coupled to the output stage of a D-class driver. The noise component extraction circuit extracts a noise component included in the output of the D-class driver and adjusts the phase and gain of the extracted noise component. After its phase and gain have been adjusted, the extracted noise component is added to the output of a low-pass filter. As a result, the noise component remaining in an audio signal that has passed through the low-pass filter is canceled.
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