Spurless fractional divider direct digital frequency synthesizer

Details Spurless fractional divider direct digital frequency synthesizer Spurless fractional divider direct digital frequency synthesizer

1985-12-24

1989-03-21

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

048150185

ABSTRACT:
A direct digital frequency synthesizer including a counter circuit for receiving input signal pulses and for providing a corresponding output signal after receiving a number of input signal pulses, the number being selected based on the state of a control signal. The invention includes a circuit for generating a substantially random sequence of numbers and a comparator circuit for comparing a respective number of the substantially random numbers to a predetermined number and for providing the control signal in response thereto.

REFERENCES:
patent: 4255793 (1981-03-01), Nakamura
patent: 4365145 (1982-12-01), Frentress
patent: 4468797 (1984-08-01), Shin
patent: 4590601 (1986-05-01), Beeman
patent: 4633194 (1986-12-01), Kikuchi et al.
Reinhardt, "Direct Digital Synthesizers", Proceedings of the 17th Annual Precise Time and Time Interval Applications and Planning Meeting (NASA/DOD), Washington, D.C., Dec. 3-5, 1985.
"Understanding Pseudo-Random Circuits" by Don Lancaster, Radio Electronics, Apr. 1976, p. 42-49.

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