January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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342 TRANSMITTERS
same multiplication factor asthe output frequency. If, for example, the 3345-MHz
output frequency must be maintained within +0.001% (100 ppm), then the MO ac-
curacy must be 100 ppm/54, or 1.85 ppm (a tight specification). Similarly, if the tem-
perature drift permitted is, say, 2000 Hz/~ then the MO drift must be 2000 Hz/54,
or 37 Hz/~
Another major problem in frequency multiplier transmitters is frequency-
and phase-modulated (FM/PM) noise. The FM/PM noise is exacerbated by fre-
quency multiplication process. If the FM/PM noise of the MO is on the order of 20
Hz, then the 3345-MHz signal will exhibit (20 Hz x 54) ...
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