US3605033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase-controlled oscillator for producing a stabilized phase output
Assignee: Fujitsu Ltd
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Filing: 1970-05-04
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Granted: 1971-09-14
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Expires: 1990-05-04
Abstract
Abstract A phase-controlled oscillator has a loop comprising phasedetecting means, a loop filter connected to the phase-detecting means and a voltage-controlled oscillator connected to the phasedetecting means and the loop filter. The phase-detecting means compares an input signal with the output signal of the voltagecontrolled oscillator. The phase-detecting means comprises a first phase detector coupling input means to the voltagecontrolled oscillator. A second phase detector has a comparison phase which differs from that of the first phase detector by pi /2 radians. The second phase detector is coupled to the input means. A voltage comparator coupled to the second phase detector discriminates the polarity of the output of the second phase detector. An inverter coupled to the first phase detector, to the voltage comparator and to the input means inverts the phase of the output of the first phase detector in accordance with the output of the voltage comparator and shifts the phase of the output of the phase-controlled oscillator by pi radians in accordance with the output of the voltage comparator.
Inventors
- 👤 Hiroshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:17
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/10; H03D; H03D13/00; H03D13/007; H03D13/009
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
205 words
A phase-controlled oscillator having a loop comprising phasedetecting means, a loop filter connected to said phase-detecting means and a voltage-controlled oscillator connected to said phase-detecting means and said loop filter, said voltagecontrolled oscillator providing an output signal, said phase-detecting means comparing an input signal with the output signal of said voltage-controlled oscillator, input means for supplying an input signal to said phase-detecting means and output means for deriving the output signal from said voltage-controlled oscillator, said phase-detecting means comprising a first phase detector coupling said input means to said voltage-controlled oscillator, a second phase detector having a comparison phase which differs from that of said first phase detector by pi /2 radians, said second phase detector being coupled to said input means, a voltage comparator coupled to said second phase detector for discriminating the polarity of the output of said second phase detector, inverter means coupled to said first phase detector, to said voltage comparator and to said voltage-controlled oscillator for inverting the phase of the input to said first phase detector in accordance with the output of said voltage comparator and for shifting the phase of the output of said phase-controlled oscillator by pi radians in accordance with the output of said voltage comparator.
Claim 2
Dependent Claim
205 words
A phase-controlled oscillator having a loop comprising phasedetecting means, a loop filter connected to said phase-detecting means and a voltage-controlled oscillator connected to said phase-detecting means and said loop filter, said voltagecontrolled oscillator providing an output signal, said phase-detecting means comparing an input signal with the output signal of said voltage-controlled oscillator, input means for supplying an input signal to said phase-detecting means and output means for deriving the output signal from said voltage-controlled oscillator, said phase-detecting means comprising a first phase detector coupling said input means to said voltage-controlled oscillator, a second phase detector having a comparison phase which differs from that of said first phase detector by pi /2 radians, said second phase detector being coupled to said input means, a voltage comparator coupled to said second phase detector for discriminating the polarity of the output of said second phase detector, inverter means coupled to said first phase detector, to said voltage comparator and to said voltage-controlled oscillator for inverting the phase of the input to said first phase detector in accordance with the output of said voltage comparator and for shifting the phase of the output of said phase-controlled oscillator by pi radians in accordance with the output of said voltage comparator.
Claim 3
Dependent Claim
47 words
A phase-controlled oscillator as claimed in claim 1, wherein said inverter means comprises a first ring modulator having an input coupled to said input means, an input connected to the output of said voltage comparator and an output coupled to the input of said first phase detector.
Claim 4
Dependent Claim
47 words
A phase-controlled oscillator as claimed in claim 1, wherein said inverter means comprises a second ring modulator having an input coupled to the output of said first phase detector, an input connected to the output of said voltage comparator and an output connected to said output means.
Claim 5
Dependent Claim
82 words
A phase-controlled oscillator as claimed in claim 1, wherein said inverter means comprises a first ring modulator having an input coupled to said input means, an input connected to the output of said voltage comparator and an output coupled to the input of said first phase detector and a second ring modulator having an input coupled to the output of said first phase detector, an input connected to the output of said voltage comparator and an output connected to said output means.
Claim 6
Dependent Claim
21 words
A phase-controlled oscillator as claimed in claim 1, wherein said voltage comparator comprises a low-pass filter connected in the input thereof.
Claim 7
Dependent Claim
53 words
A phase-controlled oscillator as claimed in claim 1, further comprising a phase shifter having an input coupled to the output of said voltage-controlled oscillator and an output coupled to the input of said second phase detector for shifting the phase of said second phase detector relative to that of said first phase detector.
Claim 8
Dependent Claim
35 words
A phase-controlled oscillator as claimed in claim 1, wherein said voltage comparator includes means for memorizing the polarity of the output of said second phase detector or the result of the discrimination of said polarity.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |