Patent US3686587A successfully refreshed from Google Patents.
US3686587A
Expired / Lapsed
US
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Voltage controlled oscillator having two phase-shifting feedback paths
Assignee: MAN AG
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Filing: 1971-05-19
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Granted: 1972-08-22
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Expires: 1991-05-19
Abstract
Abstract A voltage controlled oscillator having a pair of active elements operating differentially with respect to DC inputs and differentially as amplifiers with respect to RF feedback currents. Separate feedback paths having + OR - 45* phase shift are associated with each active element so that the sum of the phase shifts depends on the differential DC inputs to the active elements. A tuned circuit in the common feedback loop changes frequency to compensate for the phase shift, thus providing frequency control in response to the differential DC inputs.
Inventors
- 👤 Bert H Dann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:51
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/20; H03B5/24; H03B5/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A voltage controlled oscillator comprising a pair of active element means for operating differentially in response to DC input signals and differentially as amplifiers with respect to RF feedback currents, first feedback path means associated with one of said pair for providing a positive phase shift, second feedback path means associated with the other of said pair for providing a negative phase shift, and resonant tank circuit means in series with said pair of active element means and said first and second feedback path means.
Claim 2
Dependent Claim
85 words
A voltage controlled oscillator comprising a pair of active element means for operating differentially in response to DC input signals and differentially as amplifiers with respect to RF feedback currents, first feedback path means associated with one of said pair for providing a positive phase shift, second feedback path means associated with the other of said pair for providing a negative phase shift, and resonant tank circuit means in series with said pair of active element means and said first and second feedback path means.
Claim 3
Dependent Claim
20 words
The combination of claim 1 further comprising means for applying DC input signals to said pair of active element means.
Claim 4
Dependent Claim
19 words
The combination of claim 2 further comprising means for varying the differential DC gain of said active element means.
Claim 5
Dependent Claim
20 words
The combination of claim 3 further comprising means coupled to said tank circuit means for providing a variable-frequency output signal.
Claim 6
Dependent Claim
18 words
The combination of claim 4 further comprising means for varying the Q of said resonant tank circuit means.
Claim 7
Dependent Claim
33 words
The combination of claim 1 wherein said first feedback path means provides a positive phase shift of substantially +45* and said second feedback path means provides a negative phase shift of substantially -45*.
Claim 8
Dependent Claim
25 words
The combination of claim 6 wherein said first fEedback path means comprises a capacitive reactance and said second feedback path means comprises an inductive reactance.
Claim 9
Dependent Claim
21 words
The combination of claim 5 wherein said means for varying the Q comprises a resistor in parallel with said tank circuit.
Claim 10
Dependent Claim
21 words
The combination of claim 5 further comprising an emitter follower in series with said tank circuit means and feedback path means.
References Cited (Backward Citations)
US3242442A
Cited
US3320548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |