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Linje 91: ==Eksterne henvisninger== * [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) * {{cite manual \|author=Hewlett-Packard \|date=December 1965 \|title=Model 5100A Synthesizer \|series=Operating and Service Manual \|url=http://bama.edebris.com/download/hp/5100a/hp5100a.pdf}} * {{cite manual \|author=Hewlett-Packard \|date=August 1965 \|title=Model 5110A Synthesizer Driver \|series=Operating and Service Manual \|url=http://bama.edebris.com/download/hp/5110a/HP5110A.pdf}} * [http://www.google.com/patents?id=2oFzAAAAEBAJ Frequency Synthesizer] U.S. Patent 3,555,446, Braymer, N. B., (1971, January 12) * {{cite journal \|last=Oliver \|first=Bernard M. \|author-link=Bernard M. Oliver \|title=Digital Frequency Synthesis \|date=May 1964 \|volume=15 \|issue=9 \|page=1 \|journal=Hewlett-Packard Journal \|url=http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1964-05.pdf}} [[Kategori:Oscillatorer]]

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