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 Title: |
US3694766:
FREQUENCY SYNTHESIZER APPARATUS
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| Country: |
US United States of America
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| Inventor: |
Boelke, Gilbert L.; West Seneca, NY
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| Assignee: |
GTE Sylvania Incorporated
other patents from GTE PRODUCTS CORPORATION (234550) (approx. 3,618)
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| Published / Filed: |
1972-09-26
/ 1971-08-30
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| Application Number: |
US1971000175839
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| IPC Code: |
Advanced:
H03L 7/20;
Core:
H03L 7/16;
IPC-7:
H03B 3/04;
H03B 21/00;
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| U.S. Class: |
Current:
331/011;
331/019;
331/025;
331/040;
331/044;
Original:
331/011;
331/019;
331/025;
331/040;
331/044;
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| Field of Search: |
331/010-12,19,25,37,40,44
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| Priority Number: |
| 1971-08-30 |
US1971000175839 |
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| Abstract: |
Harmonic generator type of frequency synthesizer employing a reference frequency signal equal to the spacing between adjacent channels and a displaced reference frequency signal which differs from the reference frequency by a few hertz. The reference frequency signal is applied to a first harmonic generator which generates a spectrum of harmonics of the reference frequency. The spectrum is applied to a phase-locked loop which produces an output frequency signal equal to a particular one of the harmonics of the reference frequency. The displaced reference frequency signal is applied to a second harmonic generator which generates a spectrum of harmonics of the displaced reference frequency. The spectrum of harmonics of the displaced reference frequency is combined with the output signal of the phase-locked loop in a mixer and the output of the mixer is applied to a low-pass filter. The frequency of the only output signal from the filter is equal to the same particular harmonic to which the phase-locked loop is locked times the difference in frequency between the reference frequency and the displaced reference frequency. Since the difference between the frequencies is a known, fixed value, the signal from the filter is thus a precise measure of the particular harmonic of the reference frequency being produced by the phase-locked loop.
The output frequency of the filter may be counted and compared with a preset count representing the value of a predetermined harmonic of the reference frequency to which it is desired to tune the phase-locked loop. The difference between the counts is employed to generate a voltage signal which is coupled to the phase-locked loop to change the tuning of the phase-locked loop to another harmonic of the reference frequency.
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| Attorney, Agent or Firm: |
Norman J. OMalley et al. ;
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| Primary / Asst. Examiners: |
Lake, Roy; Grimm, Siegfried H.
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| Family: |
None
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First Claim:
Show all 9 claims |
What is claimed is:
1. Frequency synthesizer apparatus including in combination
- means for producing a reference frequency signal;
- means for producing a displaced reference frequency signal differing from the reference frequency signal by a predetermined differential frequency;
- first harmonic generating means coupled to the means for producing the reference frequency signal for producing a plurality of harmonics of the reference frequency signal;
- second harmonic generating means coupled to the means for producing the displaced reference frequency signal for producing a plurality of harmonics of the displaced reference frequency signal;
- a voltage controlled oscillator;
- phase detector means having a first input coupled to the first harmonic generating means, a second input coupled to the output of the voltage controlled oscillator, and an output coupled to the input of the voltage controlled oscillator to provide a phase-locked loop, whereby the frequency of the output signal of the voltage controlled oscillator is equal to a harmonic of the reference frequency signal;
- tuning means coupled to the input of the voltage controlled oscillator for selectively tuning the voltage controlled oscillator to produce an output signal of a particular harmonic of the reference frequency signal;
- frequency mixing means coupled to the second harmonic generating means and to the output of the voltage controlled oscillator for frequency mixing the plurality of harmonics of the displaced frequency signal with the particular harmonic of the reference frequency signal from the voltage controlled oscillator;
- filtering means coupled to the output of the frequency mixing means for removing the high frequency components of frequency mixing and passing the particular harmonic of the differential frequency; and
- means coupled to the filtering means for providing an indication of the value of the frequency of the signal passed by the filtering means.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 15 U.S. patent(s) that reference this one
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