Frequency dividing and multiplying circuits using a sampling technique

Claim 2

A frequency converting system comprising first frequency division circuit means for dividing by n the frequency f of an input signal to produce a first submultiple frequency f/n, second frequency division circuit means for dividing by M said submultiple frequency f/n to produce a second submultiple frequency f/Mn, frequency synthesizing circuit means responsive to said first and second submultiple frequencies for providing a sum output signal frequency equal to f/n +f/Mn, pulse forming circuit means for converting said output signal from said frequency synthesizing circuit means into a sampling pulse having a period equal to that of said output signal, and signal deriving circuit means for sampling said input signal in accordance with said sampling pulse.

Claim 3

A frequency converting system comprising a frequency controlled oscillator having an output frequency f, means responsive to said output frequency for producing a sampling pulse occurring at a period of where n and M are integers, means for utilizing said sampling pulse to effect sampling of said output signal to provide a reduced frequency signal of a frequency of 1/M of that of said output signal, a reference oscillator, means for comparing the frequencies of said reduced frequency signal and the output of said reference oscillator to produce a control signal, and means for applying said control signal to control the frequency of said controlled oscillator to make said output signal have a frequency of M times of the output frequency of said reference oscillator.

Claim 4

A frequency converting system comprising a frequency controlled oscillator having an output frequency f, means responsive to said output frequency for producing a sampling pulse occurring at a period of where n and M are integers, means for utilizing said sampling pulse to effect sampling of said output signal to provide a reduced frequency signal of a frequency of 1/M of that of said output signal, a reference oscillator, means for comparing the frequencies of said reduced frequency signal and the output of said reference oscillator to produce a control signal, and means for applying said control signal to control the frequency of said controlled oscillator to make said output signal have a frequency of M times of the output frequency of said reference oscillator.

Claim 5

A frequency converting system comprising: a controlled oscillator for generating an output having a frequency f MFs; a frequency division means including first frequency division circuit means for dividing the frequency f of the output from said controlled oscillator to f/n, second frequency division circuit means for dividing said frequency f/n to F/Mn, frequency synthesizing circuit means responsive to said first and second frequency division circuit means for producing the sum of said frequencies f/n+F/Mn, a pulse forming circuit means for converting the output signal from said frequency synthesizing circuit means into a sampling pulse having a period equal to (f/n+f/Mn) 1 and signal deriving circuit means for extracting a frequency f/M from said sampling pulse and said frequency f; a reference oscillator for generating a stable reference frequency Fs; comparator means for comparing said output frequency f/M from said frequency division means with the output frequency Fs from said reference oscillator to provide a control signal; ; and means for controlling said controlled oscillator with said control signal such that said control signal will be minimum thereby maintaining the output frequency F MFs.

Claim 6

A frequency converting system comprising: a controlled oscillator for generating an output having a frequency f MFs; a frequency division means including first frequency division circuit means for dividing the frequency f of the output from said controlled oscillator to f/n, second frequency division circuit means for dividing said frequency f/n to F/Mn, frequency synthesizing circuit means responsive to said first and second frequency division circuit means for producing the sum of said frequencies f/n+F/Mn, a pulse forming circuit means for converting the output signal from said frequency synthesizing circuit means into a sampling pulse having a period equal to (f/n+f/Mn) 1 and signal deriving circuit means for extracting a frequency f/M from said sampling pulse and said frequency f; a reference oscillator for generating a stable reference frequency Fs; comparator means for comparing said output frequency f/M from said frequency division means with the output frequency Fs from said reference oscillator to provide a control signal; ; and means for controlling said controlled oscillator with said control signal such that said control signal will be minimum thereby maintaining the output frequency F MFs.

Claim 7

A frequency converting system for sampling an input signal of frequency f to produce an output signal of frequency f/M comprising: means responsive to said input signal for deriving a sampling pulse signal occurring at a period of where n and M are integers; means for sampling said input signal with said pulse signal; and means for periodically converting M+1/n sampled portions of said input signal into said output signal of frequency f/M.

Claim 8

A frequency converting system for sampling an input signal of frequency f to produce an output signal of frequency f/M comprising: means responsive to said input signal for deriving a sampling pulse signal occurring at a period of where n and M are integers; means for sampling said input signal with said pulse signal; and means for periodically converting M+1/n sampled portions of said input signal into said output signal of frequency f/M.

Claim 9

A frequency divider for a source signal of frequency f comprising: first frequency division circuit means for dividing by n said source signal of frequency f to obtain a first output of frequency f/n; second frequency division circuit means for dividing by M said first output to obtain a second output of frequency f/nM; frequency synthesizing circuit means responsive to said first and second outputs for producing a sum signal of frequency f/n + f/nM; and means responsive to said source signal and said sum signal for producing an output signal of frequency f/M.

Claim 10

A frequency divider for a source signal of frequency f comprising: first frequency division circuit means for dividing by n said source signal of frequency f to obtain a first output of frequency f/n; second frequency division circuit means for dividing by M said first output to obtain a second output of frequency f/nM; frequency synthesizing circuit means responsive to said first and second outputs for producing a sum signal of frequency f/n + f/nM; and means responsive to said source signal and said sum signal for producing an output signal of frequency f/M.