Digital frequency synthesizing circuit and system thereof...

Details Digital frequency synthesizing circuit and system thereof... Digital frequency synthesizing circuit and system thereof...

2005-07-26

2005-07-26

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

C327S106000

Reexamination Certificate

active

06922089

ABSTRACT:
The present invention provides an all-digital frequency synthesizer circuit using interpolation technique and Linear Feedback Shift Register (LFSR). This synthesizer adaptively outputs two sequences stored in a bank of memory, or shift register. Using the idea of interpolation, all synthesizable frequencies located between two predetermined threshold frequencies can be obtained, and resolution is determined by the order of LFSR thereby. A frequency synthesizing system is also included in the present invention.

REFERENCES:
patent: 4929889 (1990-05-01), Seiler et al.
patent: 5404402 (1995-04-01), Sprunk
patent: 6577678 (2003-06-01), Scheuermann
patent: 6715105 (2004-03-01), Rearick

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