Multi-edge pulse width modulator with non-stationary residue assignment
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United States of America Patent
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Nov 6, 2012
Grant Date -
Oct 27, 2011
app pub date -
May 28, 2010
filing date -
Apr 27, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method for generating pulse width modulated signals, e.g., for use in audio amplifiers, power amplifiers, etc. An input digital value is received and divided by a number N, producing a quotient and a residue. A plurality N of edge modulation values may then be generated based on the quotient and the residue. Each of the N edge modulation values specifies an edge of the pulse width modulated signal to be generated. Generation of the N edge modulation values may comprise applying the residue to one or more of the N edge modulation values when the residue is greater than zero. The residue may be applied to different ones of the plurality N of edge modulation values during different iterations of the method in a non-stationary fashion. The pulse width modulated signal may then be generated based on the N edge modulation values.
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