Digital Frequency Synthesis Demystified by Bar-Giora Goldberg

By Bar-Giora Goldberg

· In-depth insurance of recent electronic implementations of frequency synthesis architectures
· a variety of layout examples drawn from real engineering projects
· The accompanying CD contains electronic frequency synthesis layout instruments and an digital model of the book

Digital frequency synthesis is utilized in sleek instant and communications applied sciences equivalent to radar, mobile telephony, satellite tv for pc communications, digital imaging, and spectroscopy. this is often booklet is a entire review of electronic frequency synthesis conception and functions, with a selected emphasis at the most recent techniques utilizing fractional-N phase-locked loop know-how. The layout instruments within the accompany CD enable readers to paintings throughout the examples during this e-book for a practical simulation of tangible layout utilizing electronic frequency synthesis.

· In-depth insurance of recent electronic implementations of frequency synthesis architectures
· a number of layout examples drawn from genuine engineering projects
· The accompanying CD contains electronic frequency synthesis layout instruments and an digital model of the ebook

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These negative frequencies are obviously as real as the positive ones and in DSP terminology are usually referred to as the aliasing frequencies. A special interesting case arises when the rotation is exactly 5 Hz. At this point, all the positive and negative frequencies converge. This is referred to as the Nyquist frequency(half the sampling rate). In DDS, the procedure of the signal sampling is reversed. And the process is therefore reversed. Suppose that, instead of sampling a sine wave, we generated its samples.

42 Chapter Two 2-2 Phase Noise The phase noise of a synthesizer is a major parameter and an excellent barometer of its quality. Phase noise theory will be summarized briefly here. If a signal had an ideal spectrum, all its energy would be concentrated in a single frequency. Such a signal does not exist, and all signals have additional noise. This noise causes the signal spectra to have a distribution, and it can be expressed as frequency or phase jitter. There are actually two types of phase noise, long-term and shortterm.

48–57. 9. William Egan, FS by Phase Lock, Robert Krieger Publishing, Malabar, Fl, 1990. 10. Ulrich Rhode, Digital Frequency Synthesizers,Prentice-Hall, Englewood Cliffs, NJ, 1981. 11. Sciteq Electronics, DDS-1, application note, 1990. 12. B. G. S. patent 4868510. 13. Jacques Rutman, “Oscillator Specifications: A Review of Classical and New Ideas,” Proceedings of the 31st Symposium of Frequency Control,1977. 14. W. C. Lindsey and C. M. Chie, “Specifications and Measurements of Oscillator Phase Noise Stability,” Proceedings of the 31st Symposium of Frequency Control, 1971.

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