Agilent Technologies HP 8642A/B Specifiche Pagina 388

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U Peak Tuning Range Required Due to Noise Level
.01 .1 1 10 100 1K 10K 100K 1M 10M 40M
X(f) [dBc/Hz] vs. f[Hz]
Description
This graph provides a comparison between the typical phase noise level
of a variety of sources and the minimum tuning range that is necessary for
the system to create a phase lock loop of sufficient bandwidth to make the
measurement. Typically, sources with higher phase noise require a wider
Peak Tuning Range. These sources are usually designed with a wider
tuning range in order to meet their application requirements. (Refer to the
PLL section of Instr. Params in Chapter 2, Measurement Definitions, for
further understanding of the Peak Tuning Range requirements.)
7-22 Quick Reference
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