Digital frequency synthesis demystified. DDS and fractional-N PLLs

Digital Frequency Synthesis Demystified - Dds and Fractional-N Plls (Electronic book text)
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Digital Frequency Synthesis Demystified

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Title: digital frequency synthesis demystified. Results 1 - 23 of United Kingdom. Search Within These Results:. Seller Image. Create a Want Tell us what you're looking for and once a match is found, we'll inform you by e-mail. Create a Want BookSleuth Can't remember the title or the author of a book? Our BookSleuth is specially designed for you. This results in loss of performance:. Another option is to use a multiple loop synthesiser, but this has significant cost implications.

A much cheaper option, while still retaining a general high level of performance is to use a fractional n frequency synthesizer. The concept behind fractional n synthesis, is very much as the name indicates: the divider takes on a fractional division ratio rather than an integer one that would be normally expected. To achieve this, the divider alternatives between division ratios.

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The advantage of using fractional n synthesis is that the step frequency can be small while still allowing a high comparison frequency and loop bandwidth to improve the overall synthesizer performance. When using a dual modulus divider it is easy to calculate the overall effective division ratio. To determine the effective division ratio, it is necessary to know the two division ratios and the number of VCO cycles for which each division ratio is effective.

Therefore the effective division ratio can be calculated from the formula:.

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Digital Frequency Synthesis Demystified. DDS and Fractional-N PLLs. Book • Authors: Bar-Giora Goldberg. Browse book content. About the book. Digital Frequency. Synthesis. Demystified. DDS and Fractional-N PLLs. Bar- Giora Goldberg a volume in the Demystified series. Eagle Rock, VA www.

It can be imagined that the change in division ratio over the period of the VCO cycles causes some disruption to the system. This results in close in spurious emissions that appear on the output of the factional N synthesiser. The periodic modulus changes causes a phase error accumulation which accumulates over N reference cycles of the divider.

This phase error translates into periodic disturbances in the VCO control voltage and in turn this results in the generation of spurious signals that are relatively close in to the wanted carrier.

Requirement for fractional n synthesis

Portable headphone amp w. Conclusion In this document we try to cover the basic concept of frequency synthesizers in somehow including the mathematical modeling of its. It generated using resonators. As the loop bandwidth must typically be around a tenth of the reference comparison frequency, this would mean, for the above example figures a loop bandwidth of only 10 Hz. You're using an out-of-date version of Internet Explorer. Table 1summarizes the measured phase noise at different offset frequencies. This will determine the frequency of the output waveform.

This phase accumulation occurs because the average of the feedback frequency is equal to the reference frequency. As a result, the phase error will accumulate over N reference cycles before being reset.