Patent US3815048A successfully refreshed from Google Patents.
US3815048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lc-oscillator with automatic stabilized amplitude via bias current control
Assignee: National Aeronautics and Space Administration
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Filing: 1973-06-15
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Granted: 1974-06-04
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Expires: 1993-06-15
Abstract
Abstract A stable excitation supply for transducers having a singletransistor oscillator with a coil connected to the collector and a capacitor connected from the collector to the emitter. The base is connected through a resistor to ground. The output of the oscillator transistor is connected to a buffer circuit of two transistors of opposite conductivity type. That output is connected to a standard rectifier and then as one input to a differential amplifier. The output of the differential amplifier is connected to a resistor which is connected between the emitter of the oscillator transistor and ground.
Inventors
- 👤 J Hamlet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:12
CPC Classifications
H; H03; H03L; H03L5/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A stabilized oscillator circuit comprising a first transistor having an emitter, a base, and a collector; a capacitor and an inductor connected in a tuned circuit between said collector and said emitter; a first resistor connected from said base to ground; a rectifying circuit having its input connected to receive signals from said collector; a differential amplifier having one of its inputs connected to the output of said rectifying circuit; a source of reference potential connected to the other input of said differential amplifier; a second resistor having one terminal connected to the junction of said emitter and said tuned circuit and the other terminal connected to one terminal of a third resistor, the other terminal of said third resistor being connected to ground; a fourth resistor having one terminal connected to the junction of said second and third resistors, the output of said differential amplifier being connected to the other terminal of said fourth resistor.
Claim 2
Dependent Claim
156 words
A stabilized oscillator circuit comprising a first transistor having an emitter, a base, and a collector; a capacitor and an inductor connected in a tuned circuit between said collector and said emitter; a first resistor connected from said base to ground; a rectifying circuit having its input connected to receive signals from said collector; a differential amplifier having one of its inputs connected to the output of said rectifying circuit; a source of reference potential connected to the other input of said differential amplifier; a second resistor having one terminal connected to the junction of said emitter and said tuned circuit and the other terminal connected to one terminal of a third resistor, the other terminal of said third resistor being connected to ground; a fourth resistor having one terminal connected to the junction of said second and third resistors, the output of said differential amplifier being connected to the other terminal of said fourth resistor.
Claim 3
Dependent Claim
38 words
The oscillator as in claim 1 in which said inductor is connected from said collector to a source of reference potential and said capacitor is connected between said emitter and the junction of said inductor and said collector.
Claim 4
Dependent Claim
99 words
The oscillator as in claim 2 also comprising a second transistor and a third transistor, each having an emitter, a base, and a collector and being of opposite conductivity type, connected emitter-to-emitter, with bases connected in parallel to said collector of said first transistor, the collector of said second transistor being connected to one source of reference potential and the collector of said third transistor being connected to a second source of reference potential to form a buffer circuit, the junction of the emitters of said second and third transistors being connected to the input of said rectifier circuit.
Claim 5
Dependent Claim
25 words
The circuit as in claim 1 in which said other terminal of said diffErential amplifier is adapted to be selectively connected to different reference potentials.
Claim 6
Dependent Claim
25 words
The circuit as in claim 2 in which said other terminal of said differential amplifier is adapted to be selectively connected to different reference potentials.
Claim 7
Dependent Claim
25 words
The circuit as in claim 3 in which said other terminal of said differential amplifier is adapted to be selectively connected to different reference potentials.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |