US3596207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control oscillator
Assignee: Hitachi Ltd
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Filing: 1970-01-27
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Granted: 1971-07-27
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Expires: 1990-01-27
Abstract
Abstract A voltage control oscillator adapted so that the oscillation frequency thereof can be controlled by use of a variable DC voltage, wherein a signal is positively fed from the emitter of a transistor constituting the oscillator back to the base thereof through a transformer and capacitor, a diode connected to said capacitor, and the aforementioned variable DC voltage is imparted to said transformer through said diode, thereby controlling the nonconducting period of said transistor.
Inventors
- 👤 Hiroaki Nabeyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:07
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1231; H03B5/1203; H03B5/1237; H03B5/124; H03B5/1243; H03B5/1293; H03B2200/00; H03B2200/0002; H03B2200/001
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A voltage control oscillator comprising: an oscillation transistor; a DC cutoff capacitor connected to the base of said transistor; a positive feedback transformer connected between the emitter of said transistor and said capacitor for positively feeding back to the base of said transistor a signal supplied thereto from the emitter of said transistor; a diode connected to said transformer in such a direction as to be backwardly biased when said transistor is conductive condition; means for applying a variable DC voltage to said diode for rendering said diode in conductive condition when said transistor is nonconductive condition; (controlling oscillation frequency; means for supply DC operative voltage to said transistor for activation; and an output terminal connected to the collector of said transistor, so that an oscillation output is derived out therefrom.
Claim 2
Dependent Claim
131 words
A voltage control oscillator comprising: an oscillation transistor; a DC cutoff capacitor connected to the base of said transistor; a positive feedback transformer connected between the emitter of said transistor and said capacitor for positively feeding back to the base of said transistor a signal supplied thereto from the emitter of said transistor; a diode connected to said transformer in such a direction as to be backwardly biased when said transistor is conductive condition; means for applying a variable DC voltage to said diode for rendering said diode in conductive condition when said transistor is nonconductive condition; (controlling oscillation frequency; means for supply DC operative voltage to said transistor for activation; and an output terminal connected to the collector of said transistor, so that an oscillation output is derived out therefrom.
Claim 3
Dependent Claim
23 words
A voltage control oscillator according to claim 1, wherein said transformer has an intermediate tap and said diode is connected to said tap.
Claim 4
Dependent Claim
176 words
A voltage control oscillator comprising: an oscillation transistor; a DC cutoff capacitor connected at one end thereof to the base of said transistor; a positive feedback transformer having a first winding coupled to the emitter of said transistor and a second winding coupled to said first winding and connected to the other one end of said capacitor for positively feeding back a signal derived from the emitter to the base of said transistor; control means including a source of a variable DC voltage; a diode connected between said contrOl means and the junction between the second winding of said transformer and the other one end of said capacitor, in such a direction as to be backwardly biased by a potential at the junction when said transistor is in conductive condition but forwardly biased by said DC voltage when said transistor is in nonconductive condition; source means for operatingly supplying DC operative bias voltages to said transistor; and an output terminal provided to the collector of said transistor, so that an oscillated output is derived out therefrom.
Claim 5
Dependent Claim
176 words
A voltage control oscillator comprising: an oscillation transistor; a DC cutoff capacitor connected at one end thereof to the base of said transistor; a positive feedback transformer having a first winding coupled to the emitter of said transistor and a second winding coupled to said first winding and connected to the other one end of said capacitor for positively feeding back a signal derived from the emitter to the base of said transistor; control means including a source of a variable DC voltage; a diode connected between said contrOl means and the junction between the second winding of said transformer and the other one end of said capacitor, in such a direction as to be backwardly biased by a potential at the junction when said transistor is in conductive condition but forwardly biased by said DC voltage when said transistor is in nonconductive condition; source means for operatingly supplying DC operative bias voltages to said transistor; and an output terminal provided to the collector of said transistor, so that an oscillated output is derived out therefrom.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |