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==Eksterne henvisninger==
{{Commonskat|Frequency synthesizers}}
* [http://www.hpmemory.org/news/5100/hp5100_page_00.htm Hewlett-Packard 5100A] (tunable, 0.01 Hz-resolution ''Direct Frequency Synthesizer'' introduced in 1964; to HP, direct synthesis meant [[PLL]] not used, while indirect meant a [[PLL]] was used)
* [http://www.google.com/patents?id=2oFzAAAAEBAJ Frequency Synthesizer] U.S. Patent 3,555,446, Braymer, N. B., (1971, January 12)
[[Kategori:Oscillatorer]]
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