US3622913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulated phase-locked oscillator having a low- and high-frequency response
Assignee: RCA Corp
•
Filing: 1969-10-29
•
Granted: 1971-11-23
•
Expires: 1989-10-29
Abstract
Abstract In a phase-locked loop frequency modulator, the signal applied to the reference input of the phase comparator is a frequencymodulated signal, modulated at the same rate as the output signal, for low-modulating frequencies. For higher modulating frequencies, the signal applied to the reference input of the phase comparator is a constant frequency source.
Inventors
- 👤 Don Glen Shipley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:42
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/09; H03C3/0908; H03C3/0966; H03C3/0958; H03C2200/00; H03C2200/0037; H03C2200/005; H03C2200/0054
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
172 words
A phase locked loop frequency modulator comprising: a first controlled oscillator means having a first and a second input and an output, said first oscillator providing at said output thereof in response to signals applied to said inputs thereof a signal having a frequency dependent upon said applied signals; a second controlled oscillator means having an input and an output, said second oscillator providing at said output thereof in response to signals applied to said input thereof a signal having a frequency dependent upon said applied signals; means for applying a modulating signal to said first input of said first oscillator; a low-pass filter connected to the input of said second controlled oscillator; means for applying said modulating signal to said low-pass filter; comparing means for comparing said first oscillator output signal with said second oscillator output signal and providing a control signal dependent upon the output signals from said first and second oscillators; and means for coupling said output of said comparing means to said second input of said first oscillator.
Claim 2
Dependent Claim
172 words
A phase locked loop frequency modulator comprising: a first controlled oscillator means having a first and a second input and an output, said first oscillator providing at said output thereof in response to signals applied to said inputs thereof a signal having a frequency dependent upon said applied signals; a second controlled oscillator means having an input and an output, said second oscillator providing at said output thereof in response to signals applied to said input thereof a signal having a frequency dependent upon said applied signals; means for applying a modulating signal to said first input of said first oscillator; a low-pass filter connected to the input of said second controlled oscillator; means for applying said modulating signal to said low-pass filter; comparing means for comparing said first oscillator output signal with said second oscillator output signal and providing a control signal dependent upon the output signals from said first and second oscillators; and means for coupling said output of said comparing means to said second input of said first oscillator.
Claim 3
Dependent Claim
27 words
The invention according to claim 1 wherein said first controlled oscillator means includes a voltage-controlled oscillator and said second controlled oscillator means includes a voltage-controlled crystal oscillator.
Claim 4
Dependent Claim
48 words
The invention according to claim 1 wherein said means for applying said comparing means output to said second input of said first oscillator includes a second low-pass filter, the high-frequency point of said second filter being no higher than the high-frequency point of said first mentioned low-pass filter.
Claim 5
Dependent Claim
129 words
In combination: a voltage controlled oscillator having two inputs and an output; a second voltage-controlled oscillator having an input and an output; a phase comparing circuit having two inputs and an output; first means for coupling the output of said first voltage-controlled oscillator to one of said phase-comparing circuit inputs; second means for coupling the output of said second voltage-controlled oscillator to the other of said phase-comparing circuit inputs; third means for coupling the output of said phase-comparing circuit through a first low-pass filter to one input of said first voltage-controlled oscillator; fourth means for applying a modulating voltage to the other input of said first voltage-controlled oscillator; and fifth means for applying said modulating voltage through a second low-pass filter to the input of said second voltage-controlled oscillator.
Claim 6
Dependent Claim
129 words
In combination: a voltage controlled oscillator having two inputs and an output; a second voltage-controlled oscillator having an input and an output; a phase comparing circuit having two inputs and an output; first means for coupling the output of said first voltage-controlled oscillator to one of said phase-comparing circuit inputs; second means for coupling the output of said second voltage-controlled oscillator to the other of said phase-comparing circuit inputs; third means for coupling the output of said phase-comparing circuit through a first low-pass filter to one input of said first voltage-controlled oscillator; fourth means for applying a modulating voltage to the other input of said first voltage-controlled oscillator; and fifth means for applying said modulating voltage through a second low-pass filter to the input of said second voltage-controlled oscillator.
Claim 7
Dependent Claim
16 words
The invention according to claim 4 wherein said second voltage-controlled oscillator is a voltage-controlled crystal oscillator.
Claim 8
Dependent Claim
50 words
The invention according to claim 4 wherein at any given time said first and second voltage-controlled oscillators each provide at the respective output thereof a signal having a frequency dependent upon the magnitude of said modulating voltage at said given time; and wherein said fourth means includes a frequency-dividing network.
Claim 9
Dependent Claim
30 words
The invention according to claim 6, wherein the frequency-deviation sensitivity of said first voltage-controlled oscillator and said frequency-dividing network in combination, equal the frequency-deviation sensitivity of said second voltage-controlled oscillator.
Claim 10
Dependent Claim
38 words
The invention according to claim 7, wherein said second voltage-controlled oscillator is a voltage-controlled crystal oscillator, and wherein the high-frequency point of said second low-pass filter is no higher than the high-frequency point of said first low-pass filter.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |