Method and system for rational frequency synthesis using a numer

Details Method and system for rational frequency synthesis using a numer Method and system for rational frequency synthesis using a numer

1996-04-16

1998-07-14

Gordon, Paul P.

Boots, shoes, and leggings

327175, G06F 102, H03K 3017, H03K 504, H03K 708

Patent

active

057814597

ABSTRACT:
A numerically controlled oscillator (11), (NCO), generates an NCO output (114) having a time-averaged frequency proportional to a rational number, even if the number of bits in the binary frequency control numbers (104, 106) is insufficient to represent the fractional part of the rational frequency number precisely. Frequency control numbers (104, 106) alternate between numerically adjacent values proportional to the desired time-averaged rational frequency control number. Frequency control numbers and their duty cycles are calculated for synthesizing a time-averaged rational frequency.

REFERENCES:
patent: 4053739 (1977-10-01), Miller et al.
patent: 4555793 (1985-11-01), Benamy
patent: 4658406 (1987-04-01), Pappas
patent: 4998072 (1991-03-01), Sheffer
patent: 5179348 (1993-01-01), Thompson
patent: 5521534 (1996-05-01), Elliot

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