US4021757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase lock-loop modulator using an arithmetic synthesizer
Assignee: RCA Corp
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Filing: 1976-04-08
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Granted: 1977-05-03
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Expires: 1996-04-08
Abstract
Abstract A phase lock loop has a phase modulator within the loop to produce an output signal of frequency shifted or modulated RF. The modulator is controlled by input signals via an arithmetic synthesizer.
Inventors
- 👤 Edward Joachim Nossen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:26
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/09; H03C3/0908; H03C3/0975; H03C3/0916; H03C3/0925; H03C3/0941; H04; H04L; H04L27/00; H04L27/18; H04L27/20; H04L27/2003; H04L27/2007; H04L27/2014
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
In a phase lock loop including voltage-controlled oscillator means, phase detector means coupled to clock means, and low pass filter means for coupling an output signal from the phase detector means to control the frequency of an output signal from said voltage-controlled oscillator means, the improvement comprising: phase modulator means coupling said output signal to said phase detector means for modulating and for translating the frequency of said voltage-controlled oscillator; and modulator control means for coupling a modulating signal to said modulator means.
Claim 2
Dependent Claim
83 words
In a phase lock loop including voltage-controlled oscillator means, phase detector means coupled to clock means, and low pass filter means for coupling an output signal from the phase detector means to control the frequency of an output signal from said voltage-controlled oscillator means, the improvement comprising: phase modulator means coupling said output signal to said phase detector means for modulating and for translating the frequency of said voltage-controlled oscillator; and modulator control means for coupling a modulating signal to said modulator means.
Claim 3
Dependent Claim
15 words
The invention as claimed in claim 1 wherein said modulator means is a four-phase modulator.
Claim 4
Dependent Claim
16 words
The invention as claimed in claim 1 wherein said modulator control means includes an arithmetic synthesizer.
References Cited (Backward Citations)
US3689914A
Cited
US3838350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |