Apparatus and method for harmonic reduction in a direct digital synthesizer
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United States of America Patent
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Dec 21, 1999
Grant Date -
N/A
app pub date -
Apr 16, 1997
filing date -
Apr 16, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A direct digital synthesizer circuit and method for reducing the harmonic content in a synthesized output signal. The direct digital synthesizer generates first and second address signals driving first and second sine look-up read only memory (sine ROM) circuits. The first and second sine ROMs generate first and second digital sine wave signals which are offset in phase from one another by 180 degrees. The first and second digital sine wave signals are converted to first and second analog sine wave signals. The first and second analog sine wave signals are combined in a subtractor circuit. As a result of the phase relationship between the first and second analog sine wave signals, the fundamental component of these signals are emphasized by subtraction while the second harmonic component of theses signals are simultaneously de-emphasized.
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