US4074209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide range frequency modulation of narrow loop bandwidth phase-locked oscillators
Assignee: RCA Corp
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Filing: 1976-12-13
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Granted: 1978-02-14
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Expires: 1996-12-13
Abstract
Abstract Frequency-modulated phase-locked loop oscillator with a special modulator bypassing the phase-locked loop to inject modulation voltage directly into the voltage-controlled oscillator of the loop to broaden the bandwidth of modulation.
Inventors
- 👤 Morris Lysobey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:15
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/09; H03C3/0908; H03C3/0966; H03C3/0941; H03C3/095; H03C3/10; H03C3/12; H03C3/22; H03C3/222; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183; H03L7/187; H03L7/189; H03C2200/00; H03C2200/0037; H03C2200/005; H03C2200/0054; H03L2207/00; H03L2207/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
In a circuit for producing a frequency-modulated output signal, including reference modulator means responsive to a modulating signal for producing a reference signal and phase-locked loop means having voltage-controlled-oscillator means responsive to a control signal for producing said output signal, phase discriminator means responsive to said output signal and to said reference signal for producing an error signal proportional to the difference in phase between said output signal and said reference signal, the improvement comprising: Vco modulator means reponsive to the modulating signal for producing a correction signal, the VCO modulator means including means for amplifying said modulating signal by a factor proportional to the ratio of the sensitivity of said reference modulator means to the sensitivity of said voltage-controlled-oscillator; and combining means responsive to the error signal and said correction signal for supplying said control signal to said voltage-controlled-oscillator means.
Claim 2
Dependent Claim
141 words
In a circuit for producing a frequency-modulated output signal, including reference modulator means responsive to a modulating signal for producing a reference signal and phase-locked loop means having voltage-controlled-oscillator means responsive to a control signal for producing said output signal, phase discriminator means responsive to said output signal and to said reference signal for producing an error signal proportional to the difference in phase between said output signal and said reference signal, the improvement comprising: Vco modulator means reponsive to the modulating signal for producing a correction signal, the VCO modulator means including means for amplifying said modulating signal by a factor proportional to the ratio of the sensitivity of said reference modulator means to the sensitivity of said voltage-controlled-oscillator; and combining means responsive to the error signal and said correction signal for supplying said control signal to said voltage-controlled-oscillator means.
Claim 3
Dependent Claim
104 words
The invention as claimed in claim 1 further including: frequency divider means coupled between said voltage-controlled-oscillator means and said phase discriminator means for reducing the frequency of said output signal before being applied to said phase discriminator means; frequency selection means for supplying a signal for varying the frequency of the output signal; biasing means responsive to said frequency selection means for supplying a bias signal to said VCO modulator means to compensate for changes in the sensitivity of said voltage-controlled-oscillator means; and means for coupling the signal from said frequency selection means to said frequency divider means for controlling the frequency division ratio.
Claim 4
Dependent Claim
67 words
The invention as claimed in claim 2 wherein said voltage-controlled-oscillator means includes first varactor means responsive to said error signal for controlling the frequency of the output signals; wherein said VCO modulator means includes second varactor means responsive to said modulating signal for varying the bias across said second varactor means; and wherein said combining means includes means for coupling together said first and second varactor means.
References Cited (Backward Citations)
US3414842A
Cited
US3622913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |