US4725786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Full-octave direct frequency synthesizer
Assignee: JPMorgan Chase Bank NA
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Filing: 1984-07-26
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Granted: 1988-02-16
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Expires: 2004-07-26
Abstract
Abstract A full-octave direct frequency synthesizer which can switch in under one microsecond and whose control frequencies are all harmonics of a single precision clock. Each stage generates a frequency in the 50-100 MHz range; the generated frequency is the sum of one-tenth of the input frequency plus an added increment within the full octave 50-100 MHz range. Each stage includes a first section for operating on the input frequency and the control frequencies for deriving a selected one of five possible frequencies, and a second section for deriving two possible frequencies from each of the five derivable by the first section. The final stage generates a frequency in the 500-1,000 MHz range, in steps of 0.5 Hz.
Inventors
- 👤 Robert J. Papaieck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:13
CPC Classifications
H; H03; H03B; H03B21/00; H03B21/01; H03B21/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
A full-octave direct frequency synthesizer comprising means for generating a plurality of drive frequencies all of which are integral multiples of the lowest drive frequency; a plurality of sequentially connected stages; and means for coupling all of said drive frequencies to said stages; each of a sub-group of said sequentially connected stages operating on an input frequency derived from the preceding stage and generating an output frequency for the succeeding stage which is a function of the sum of one-tenth of the input frequency plus an added increment within at least a full-octave range; each of the stages in said sub-group including at least first and second serially-connected sections each including means selectively operable for mixing an input frequency and a drive frequency to form a respective group of frequencies, and a plurality of switchable filter means for selecting one of said respective group of frequencies; and means for selecting one of the respective frequencies of the last serially-connected section for the succeeding stage.
Claim 2
Dependent Claim
164 words
A full-octave direct frequency synthesizer comprising means for generating a plurality of drive frequencies all of which are integral multiples of the lowest drive frequency; a plurality of sequentially connected stages; and means for coupling all of said drive frequencies to said stages; each of a sub-group of said sequentially connected stages operating on an input frequency derived from the preceding stage and generating an output frequency for the succeeding stage which is a function of the sum of one-tenth of the input frequency plus an added increment within at least a full-octave range; each of the stages in said sub-group including at least first and second serially-connected sections each including means selectively operable for mixing an input frequency and a drive frequency to form a respective group of frequencies, and a plurality of switchable filter means for selecting one of said respective group of frequencies; and means for selecting one of the respective frequencies of the last serially-connected section for the succeeding stage.
Claim 3
Dependent Claim
84 words
A full-octave direct frequency synthesizer in accordance with claim 1 wherein the first section of each stage includes a mixer sub-stage for mixing the input frequency and the highest drive frequency to convert the input frequency upward, and the second section of each stage includes an additional mixer sub-stage for selectively forming one of a respective group of frequencies by selectively leaving the converted input frequency unchanged, or adding to or subtracting from the converted input frequency one of the two lowest drive frequencies.
Claim 4
Dependent Claim
42 words
A full-octave direct frequency synthesizer in accordance with claim 1 wherein the last section of at least some of said stages includes divide-by-ten means selectively operable for dividing the frequency extended from the preceding section to the output of the last section.
Claim 5
Dependent Claim
32 words
A full-octave direct frequency synthesizer in accordance with claim 1 wherein said drive frequencies are in the ratios 1:2:16, and the first stage uses the lowest drive frequency as its input frequency.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |