Direct digital synthesizer with adjustable clock frequency

Details Direct digital synthesizer with adjustable clock frequency Direct digital synthesizer with adjustable clock frequency

1993-07-02

1995-06-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327107, 327131, H03L 716

Patent

active

054246644

ABSTRACT:
An adjustable digital synthesizer has frequency increments of a selected step size. The adjustable digital synthesizer includes a digital accumulator having N stages. The digital accumulator counts at a predetermined clock frequency such that, in response to each clock, the accumulator increments the step size determined by the digital input. The accumulator counts to 2.sup.Nth state and wraps around in response to an overflow. An adder, responsive to the overflow, adds an offset to the accumulator, the offset being a function of the difference between 2.sup.Nth times the minimum step size and the desired clock frequency.

REFERENCES:
patent: 3842354 (1974-10-01), Dunne
patent: 4514696 (1985-04-01), Genrich
patent: 4752902 (1988-06-01), Goldberg
patent: 5084681 (1992-01-01), Kovalick et al.
patent: 5151661 (1992-09-01), Caldwell et al.
patent: 5179848 (1993-01-01), Thompson

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