Multiple channel class D audio amplifier
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United States of America Patent
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Mar 12, 2002
Issued Date -
N/A
app pub date -
Sep 1, 1999
filing date -
Jul 23, 1997
priority date (Note) -
Expired
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Abstract
An improved class D power amplifier is disclosed. Instead of using prior art triangle waves a ramp signal having a first state of about 90% or greater is used and a second state for the remainder of the cycle. Further, the amplifier includes flip-flops and amplifiers with hysteresis to reduce switching noise. Also, level shifting circuitry is provided for shifting the level of the input signal in response to both DC and AC variations in the power supply and to provide power supply rejection. Still further, multiple channels may be used with all of the channels synchronized to the same timing source.
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