By Bar-Giora Goldberg
ISBN-10: 1878707477
ISBN-13: 9781878707475
· In-depth insurance of contemporary electronic implementations of frequency synthesis architectures
· a number of layout examples drawn from genuine engineering projects
· The accompanying CD comprises electronic frequency synthesis layout instruments and an digital model of the book
Digital frequency synthesis is utilized in smooth instant and communications applied sciences resembling radar, mobile telephony, satellite tv for pc communications, digital imaging, and spectroscopy. this can be booklet is a entire assessment of electronic frequency synthesis thought and purposes, with a specific emphasis at the newest techniques utilizing fractional-N phase-locked loop expertise. The layout instruments within the accompany CD let readers to paintings throughout the examples during this ebook for a pragmatic simulation of tangible layout utilizing electronic frequency synthesis.
· In-depth assurance of recent electronic implementations of frequency synthesis architectures
· Numerous layout examples drawn from genuine engineering projects
· The accompanying CD comprises electronic frequency synthesis layout instruments and an digital model of the publication
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Additional resources for Digital frequency synthesis demystified. DDS and fractional-N PLLs
Sample text
As an example, one possible Introduction to Frequency Synthesis 23 Figure 1-11 Reference generation for DA design. method is demonstrated in Fig. 1-11. The 10-MHz comb generates 10-MHz comb lines 10, 20, 30, …, 140 MHz. The 14 is generated by 140/10 (or 70/5), the 16 by 80/5, the 18 by 90/5, the 20 by 120/6, the 22 by 110/5, the 130 by 120 ϩ 10 (both available), and the 131 by 120 (available) ϩ 110 (available)/10. This architecture usually operates in blocks of decades and is used here to demonstrate the DA principles.
For example, if the design in Fig. 1-10 were repeated 6 times, so that the range of 16. 999999 MHz can be achieved, and if the requirement were for a spurious response of Ϫ70 dBC (this means that any spurious signal must be at least 70 dB below the carrier), then clearly the (similar and common) stages need to have a spurious response of only Ϫ50 dBC before the division by 10 since the divider’s operation improves the output spurious signal by 20 log 10 ϭ 20 dB (2-3) High-quality synthesizers employ multiple loops and dividers as a means to reduce spurious (and phase noise) signal levels.
1-3 Auxiliary Specifications These specifications are usually related to the execution of the specific synthesizer but are not dealt with here. Usually they include parameters such as size, power supply requirements, environmental factors, quality, and reliability. 1-4 Review of Synthesis Techniques In this section we present a concise review of the three major synthesis techniques. But before we go into the details of these main techniques, it is worthwhile to mention what might be the simplest and crudest technique—digital frequency synthesis, namely, a programmable divider.
Digital frequency synthesis demystified. DDS and fractional-N PLLs by Bar-Giora Goldberg
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