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Keywords
(5)
Continued Fraction Expansion
Fourier Series
Mathematical Model
Series Expansion
Direct Digital Frequency Synthesizer
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Spectral purity of direct digital frequency synthesizers
Spectral purity of direct digital frequency synthesizers,10.1109/FREQ.1990.177538,V. F. Kroupa
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Spectral purity of direct digital frequency synthesizers
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V. F. Kroupa
A short introduction to the problems of frequency synthesis is given. Mathematical models suitable for direct digital frequency synthesizers (DDFS) which provide quasiperiodic omission of clock pulses such as
continued fraction
expansion, modified Engel series expansion, and moduloN arithmetic are investigated. It is shown that in these instances the peaks of the phasetime modulation function do not exceed one clock period. Using the
Fourier series
algorithm all spurious signals in the output wave can be found. However, the procedure might be lengthy. Pulse train, square wave, and sine wave outputs are discussed
Conference:
IEEE International Frequency Control Symposium  FCS
, 1990
DOI:
10.1109/FREQ.1990.177538
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Citations
(2)
Close to the carrier noise in DDS
(
Citations: 9
)
Vhceslav F. Kroupa
Conference:
IEEE International Frequency Control Symposium  FCS
, 1996
Discrete spurious signals and background noise in direct frequency synthesizers
(
Citations: 4
)
V. K. Kroupa
Conference:
IEEE International Frequency Control Symposium  FCS
, 1993