13.07.2015 Views

NIST Technical Note 1337: Characterization of Clocks and Oscillators

NIST Technical Note 1337: Characterization of Clocks and Oscillators

NIST Technical Note 1337: Characterization of Clocks and Oscillators

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llS<strong>and</strong>C"=-N(.V -l)7l"o~1r~ d 0 sin' U {I, 0 U U.• 0U_ sin' .\"ru }.,-. . ••• sm ru(70)This is the basis for the plot in Fig. 1 in the text <strong>of</strong> f.lversus a. For a ~ 1 we must include the high-frequencycut<strong>of</strong>f fA.For loT = 2 <strong>and</strong> r = 1 the results are particularly simple.We have( 2(2 '» -a-1h 2 1~ d a-2'« (71)a. ."','" = T " -;;;: U U SID U11" 0for power law spectral densities. For N = 2 <strong>and</strong> generalr we get= ';-1~ du S.(.!£..)...1fT 0 7l:'Tcos 2u(r+ 1)+cos 2u(r-l)1- cos 2u- cos 2ru + 2 2= ~ 1~ du S.(.!£..) sin' 1.1 ~in2 ru.(72)11"'" n 1I"T UThe first form. in (72) is particularly simple <strong>and</strong> is alsouseful for r = 1 in place <strong>of</strong> (71).Let us discuss the case for

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