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Variable frequency synthesizer with reduced phase noise

  • US 4,602,220 A
  • Filed: 08/14/1985
  • Issued: 07/22/1986
  • Est. Priority Date: 08/22/1984
  • Status: Expired due to Fees
First Claim
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1. A variable frequency synthesizer comprising:

  • a reference signal source for generating a reference signal of a frequency fs ;

    frequency transforming means supplied with the reference signal from the reference signal source for increasing the frequency of the reference signal, said frequency transforming means including a plurality of up-converters, wherein an output of frequency f1 =mfs is produced, where m is an integer equal to or greater than 3;

    side band signal generating means supplied with the reference signal from the reference signal source for outputting n signals of frequencies fs, 2fs, 3fs, . . . and nfs, wherein n is a positive integer smaller than m, and the degree of generation of phase noise by the side band signal generating means equal to or lower than the degree of generation of phase noise by the frequency transforming means;

    a frequency mixer for frequency mixing the output signals of the side band signal generating means and the output of the frequency transforming means; and

    a variable filter for selecting one frequency component (m±

    ni)fs from the output of the frequency mixer, wherein, ni =0, 1, 2 . . . n.

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