Direct digital frequency systhesizer

Details Direct digital frequency systhesizer Direct digital frequency systhesizer

1997-12-01

1999-11-16

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327105, 364718, 364721, G06F 102, H04L 2720

Patent

active

059864834

ABSTRACT:
A direct digital frequency synthesizer outputting a sine signal is disclosed, comprising an accumulator, a symmetry circuit, a coarse circuit, a fine circuit and a sign circuit, wherein the accumulator sequentially outputs a sample address according to a frequency control signal. The symmetry circuit takes the complement of the sample address according to a first clock, the period of the first clock being twice the period of the first MSB of the sample address, to obtain a symmetric sample address represented by N bits. The coarse circuit connected to the symmetry circuit outputs the first M MSBs of the symmetric sample address as the first M MSBs of the sine signal. The fine circuit predicts the last N-M LSBs of the sine signal from the last N-M LSBs of the symmetric sample address according to the first M MSBs of the symmetric sample address of the coarse circuit. Then, the sign circuit outputs a sign bit of the sine signal according to a second clock, the period of the second clock being four times that of the period of the first MSB of the symmetric sample address.

REFERENCES:
patent: 5073869 (1991-12-01), Bjerede

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