Direct digital synthesizer with feedback shift register

Details Direct digital synthesizer with feedback shift register Direct digital synthesizer with feedback shift register

1992-03-02

1992-09-01

Mai, Tan Y.

Boots, shoes, and leggings

328 14, G06F 102

Patent

active

051445719

ABSTRACT:
A direct digital synthesizer (DDS) for generating an output periodic waveform from a stored digital waveform has a linear feedback shift register coonfigured as a counter. The linear feedback shift register is clocked by the internal reference clock of the DDS, and a predetermined output of the linear feedback shift register is detected to provide a control signal. The control signal causes the frequency or phase of the output waveform to be changed according to control parameters input to a control logic circuit. The control logic circuit preloads the new parameter vlaues into appropriate frequency/phase registers which are switched to the input of the accumulator in the DDS on the next cycle of the reference clock when the control signal is detected.

REFERENCES:
patent: 4328554 (1982-05-01), Mantione
patent: 4652832 (1987-03-01), Jasper
patent: 5010506 (1991-04-01), Hrncirik
patent: 5014231 (1991-05-01), Reinhardt et al.
patent: 5053982 (1991-10-01), McCune, Jr.

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