US3582810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency synthesizer system
Assignee: RACAL-DANA INSTRUMENTS Inc
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Filing: 1969-05-05
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Granted: 1971-06-01
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Expires: 1989-05-05
Abstract
Abstract A frequency synthesizer system is disclosed utilizing phase registration for frequency regulation and affording smooth frequency changes in accordance with a control signal. The output from a voltage controlled oscillator is tallied (cyclically) by a digital counter, the contents of which is periodically compared with the contents of an accumulator that is incremented periodically to define the desired frequency, e.g. cycles per second. The comparison provides a primary regulation signal for combination with a change-commanding signal (provided from an integrator) for application to the oscillator. The slope of the integrator output is proportional to an applied control signal and that output is monitored to detect a change that is equivalent to a digital quantity, whereupon the integrator is reset and the accumulator is incremented by the digital quantity. Fractional quantities are also accommodated by the system.
Inventors
- 👤 Garry C Gillette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/181
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
A control system wherein a periodic signal source, frequency controllable by a signal, is controlled to provide a varying frequency in response to a control signal, comprising: digital means for counting cycles of said periodic signal source; digital register means for registering a numerical value representative of a desired number of cycles per unit of time; digital accumulator means for accumulating numerical-value signals from said register means on a periodic bases; means for periodically comparing the contents of said accumulator with the contents of said means for counting whereby to provide a primary signal for controlling the frequency of said periodic signal source; means for providing a continuously variable signal in accordance with said control signal for combination with said primary signal for varying the frequency of said periodic signal source; and means for monitoring said continuously variable signal to digitally alter the contents of said accumulator means and accordingly reset said means for providing a continuously variable signal.
Claim 2
Dependent Claim
159 words
A control system wherein a periodic signal source, frequency controllable by a signal, is controlled to provide a varying frequency in response to a control signal, comprising: digital means for counting cycles of said periodic signal source; digital register means for registering a numerical value representative of a desired number of cycles per unit of time; digital accumulator means for accumulating numerical-value signals from said register means on a periodic bases; means for periodically comparing the contents of said accumulator with the contents of said means for counting whereby to provide a primary signal for controlling the frequency of said periodic signal source; means for providing a continuously variable signal in accordance with said control signal for combination with said primary signal for varying the frequency of said periodic signal source; and means for monitoring said continuously variable signal to digitally alter the contents of said accumulator means and accordingly reset said means for providing a continuously variable signal.
Claim 3
Dependent Claim
29 words
A control system according to claim 1 wherein said means for providing a continuously variable signal comprises an integrator circuit connected to receive said control signal as an input.
Claim 4
Dependent Claim
41 words
A control system according to claim 2 wherein said means for monitoring comprises a threshold circuit for sensing an increment in said continuously variable signal of digital proportions to accordingly alter the contents of said accumulator and reset said integrator circuit.
Claim 5
Dependent Claim
26 words
A control system according to claim 1 further including means for sampling said continuously variable signal to provide samples thereof for combination with said primary signal.
Claim 6
Dependent Claim
18 words
A control system according to claim 1 further including a plurality of means for providing said control signal.
Claim 7
Dependent Claim
18 words
A control system according to claim 5 wherein one of said means for providing comprises a ramp generator.
Claim 8
Dependent Claim
61 words
A control system according to claim 1 further including residue digital stages in said accumulator for registering digits of lesser significance then the least significant digit registered by said digital means for counting, and further including means for deriving an analog signal from residue stages for combination with said primary signal and said continuously variable signal to control said signal source.
Claim 9
Dependent Claim
29 words
A control system according to claim 7 wherein said means for providing a continuously variable signal comprises an integrator circuit connected to receive said control signal as an input.
Claim 10
Dependent Claim
41 words
A control system according to claim 8 wherein said means for monitoring comprises a threshold circuit for sensing an increment in said continuously variable signal of digital proportions to accordingly alter the contents of said accumulator and reset said integrator circuit.
Claim 11
Dependent Claim
26 words
A control system according to claim 9 further including means for sampling said continuously variable signal to provide samples thereof for combination with said primary signal.
References Cited (Backward Citations)
US3271688A
Cited
US3395361A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |