RF Spectrum Analyzer ? ???? - PowerPoint PPT Presentation

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RF Spectrum Analyzer ? ????

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Title: RF Spectrum Analyzer ? ????


1
RF Spectrum Analyzer ? ????
RF Radio Frequency
Spectrum ?? ???? ???? ???? ?? ???? ??? ???? ??
??? ??? ??? 1? ??? ???? ??, ? 1???? ????? ???
?? ???, ??? Hz
?? ??? ??? ?? ???? ?? ??? ??? ??
???? ??? ??? ?? ??? ????.
?? ??? ??
2
?? ??? ?? ??? ?? ???? ??
3
? ????? ????? ?
?? ??? ??? ???? ??
4
?? ????? ?? ?? ????? ?? ? ??? ?? ??? ?? ?? ??
? ?? ?? ? ? ??. ? ???? ???, ???? ?? ?? ?? ?? ? ??
?? ? ??? ??? ????. ???? 2? ??
??? ????? ???? ??? ??? ??? ??? ???? ?? ??? ??
? ???? ??? ??? ???. ?? ??? ?? ??? ???? ??? ???
???? ? ??? ??? ??? ???? ???. ???? 2? ??
??? ?? ??? ??? ?? ??? ??? ??? ??? ?? ????
??? ?? ??? ???? ???? ? ????. ? ???? ??
application ??? ????? ??? ??? ???? ?? ??? ?? ??
? ? ???.
???? ?????? ???? ?? application ??? ??? ?????
??? ?? ?? ????? ???? ?? ??? ?????.
5
Harmonic ???, ?? ???? ???? ? ???? ???? ??
??? ?? ??? ????? ?? ??. ? fi(t), I 1,2,3 ??
f1(t) ???, ??? f2,3,4(t) 2,3,4 ????? ??.
SSB Single side band , ? ???? ???? ?? ??? ???
?? ????? ??? ??,AM ???? ???? ????.
6

7
EMI electro magnetic interference, ???? ???????
??? ?? ??? ????? ???? ?? ??? ????? ?????? ?????
????? ?? . ?? ?? ??? ? ??? ???.
VDE ?? ?? ??? ??, ?? ???? ???? ?? ??? ??? ????
8
Spec.point of Spectrum analyzer ??? ?? ???
???? ?? ??? ??? ??? ??? ??? ?? (Span function)
9
??? ??
Low frequencies for baseband and IF
Measuring harmonics 50 GHz and beyond!
?? ????? ?? frequency ? ??? ???? ???? harmonics
???? ???? ?? ?? frequency ? 10 ?? ??? ????
frequency bandwidth ? ?? ? ? ?? ???.
10
???
??? ??? ??? ???? ? ??? ????? ??? ? ??? ? ? ??.
11
???
Effective Level of Displayed Noise is a Function
of RF Input Attenuation
signal level
10 dB
Attenuation 20 dB
Attenuation 10 dB
RF input ???? ?? ? ?? ??? ???? ????. ? S/N ??
??????, ?? ???? ??? ???? ????? ? RF input ????
???? ?? ? ???.
12
??? ??? ??
Span function ???? ? ? ?? ? ??? ???? Spectrum
Aanlyzer? ??? ???, ? ??? ???? ?? ? ? ?? ????
???. ?? ??? ???? 20MHz/div. ?? span ? ??????
Spectrum Analyzer ? ?? ?? ? ??? 20MHz/div. 10
200MHz ? ?? ? ???.
20MHz/div.10200MHz
13
??? ??? ??
? Center frequency ? 175MHz ?? span/div. 20MHz
?? start frequency ? stop Frequency? ????
? Start frequency ? 75MHz Stop frequency ? 275MHz
14
??? ??? ?? ? ? ?
THE END
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