Apparatus and method for harmonic reduction in a direct digital

Details Apparatus and method for harmonic reduction in a direct digital Apparatus and method for harmonic reduction in a direct digital

1997-04-16

1999-12-21

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327106, 708271, H03B 2100

Patent

active

060054190

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.

REFERENCES:
patent: 4992743 (1991-02-01), Sheffer
patent: 5375065 (1994-12-01), Owen
patent: 5521533 (1996-05-01), Swanke
patent: 5880689 (1999-03-01), Kushner

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