Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synthesizer
Patent
1996-05-17
1998-08-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synthesizer
327107, 327141, 327114, 364721, H03B 1914, H03K 513
Patent
active
057899509
ABSTRACT:
A direct digital synthesizer capable of generating a desired frequency with small circuitry, low power consumption, and no spurious components. It includes an accumulator for accumulating a frequency control word for each pulse of a clock signal, a D/A converter for converting the accumulation value of the accumulator to an analog voltage, an integrator for smoothing the output of the D/A converter, a comparator for comparing the output of the integrator with a reference voltage, and for producing pulses at timings at which the output of the integrator reaches the reference voltage while the accumulation value of the accumulator is increasing, and a pulse generator for producing pulses in synchronism with the rising edges of the output of the comparator. The output pulses of the pulse generator constitute an output of the direct digital synthesizer.
REFERENCES:
patent: 4328554 (1982-05-01), Mantione
patent: 4340863 (1982-07-01), Scordo
Create signals having optimum resolution, response, and noise, Earl McCune, Jr., Digital RF Solutions Corp.; EDN, vol. 36, No. 6, pp. 95-108, Mar. 1991.
A Short Survey of Frequency Synthesizer Techniques, V. Reinhardt, et al; Proc. 40th Annual Frequency Control Symposium, pp. 355-365, May 1986.
"A DDS with analog interpolation circuits", Nakagawa et al, Proceedings of the 1996 Institute of Electronics Information and Communication Engineers (IEICE) conference, Mar. 29, 1996, p. 306 (in Japanese).
Callahan Timothy P.
Le Dinh
Nippon Telegraph and Telephone Corporation
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