Prime number spur reduction for digital synthesis

Details Prime number spur reduction for digital synthesis Prime number spur reduction for digital synthesis

1990-12-19

1993-04-13

Mai, Tan V.

Boots, shoes, and leggings

328 14, G06F 102

Patent

active

052028461

ABSTRACT:
A variable frequency synthesizer including a modulo N counter having a count limit N that is a product of prime numbers and responsive to a digital control word for providing a digital ramp signal representative of the phase of a sinewave, an inversion circuit responsive to the digital ramp signal for producing a digital triangular signal having a frequency determined by the control word, and conversion means for converting the digital triangular signal to an analog triangular signal. Selecting the count limit N as a product of prime numbers substantially reduces spurious distortion due to time step quantization of the digital ramp signal.

REFERENCES:
patent: 4039806 (1977-08-01), Fredriksson et al.
patent: 4192007 (1980-03-01), Becker
patent: 4346448 (1982-08-01), Insam et al.
patent: 4476536 (1984-10-01), Jones, Jr.
patent: 4901265 (1990-02-01), Kerr et al.
patent: 5070254 (1991-12-01), Summers

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