US4286219A
Expired / Lapsed
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High resolution frequency synthesizer
Assignee: Comsat Corp
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Filing: 1979-09-27
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Granted: 1981-08-25
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Expires: 1999-09-27
Abstract
Abstract A programmable frequency source is used to synthesize a wide range of frequencies in small increments. A master oscillator and a single programmable divider are used. Each selected frequency possesses a phase jitter, predictable and a function of the master oscillator-to-output frequency relationship. The output of the frequency source is a square wave whose transitions are edge synchronous with the master oscillator.
Inventors
- 👤 Shanti S. Gupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:14
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/64; H03K23/66; H03K23/667
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
A high resolution frequency synthesizer for producing a pulse train of frequency f D comprising: an oscillator producing an output pulse train having a clock frequency of f ms , a programmable divider receiving an input signal that is a function of f ms and performing a division thereon in accordance with: [(N E +N R )f D ]/N R f D where, N E is an even number higher but not exceeding f ms /f D , and N R is the remainder of f ms /f D -N E , either a whole number or fraction but not a negative quantity to obtain an output f x , that is the frequency or number of bits per second which is an even multiple of f D and means for obtaining a symmetrical waveform from f x which is f D .
Claim 2
Dependent Claim
143 words
A high resolution frequency synthesizer for producing a pulse train of frequency f D comprising: an oscillator producing an output pulse train having a clock frequency of f ms , a programmable divider receiving an input signal that is a function of f ms and performing a division thereon in accordance with: [(N E +N R )f D ]/N R f D where, N E is an even number higher but not exceeding f ms /f D , and N R is the remainder of f ms /f D -N E , either a whole number or fraction but not a negative quantity to obtain an output f x , that is the frequency or number of bits per second which is an even multiple of f D and means for obtaining a symmetrical waveform from f x which is f D .
Claim 3
Dependent Claim
29 words
The synthesizer of claim 1 further comprising an AND gate receiving respective outputs from said oscillator and said programmable divider and producing a bit rate of f x .
Claim 4
Dependent Claim
20 words
The synthesizer of claim 2 further comprising a second divider for dividing said AND gate output by N E /2.
Claim 5
Dependent Claim
26 words
The synthesizer of claims 1, 2 or 3 wherein said means to obtain a symmetrical waveform comprises a divide by 2 divider, dividing f x .
Claim 6
Dependent Claim
48 words
The synthesizer of claims 1, 2 or 3 further comprising controller means to convert N k to N p when the time loss in one second equals 1/N p , said controller means providing said programmable divider with an input signal N p to convert N k .
Claim 7
Dependent Claim
18 words
The synthesizer of claim 5 further comprising counter means to establish a count indicative of N p .
Claim 8
Dependent Claim
21 words
The synthesizer of claim 6 wherein said counter means comprises a counter counting to a predetermined value of N p .
Claim 9
Dependent Claim
23 words
The synthesizer of claim 6 wherein said counter means comprises a programmable counter counting to a variable, programmed value of N p .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |