US3701041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplitude stabilized complementary transistor oscillator
Assignee: Robert Bosch GmbH
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Filing: 1971-02-05
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Granted: 1972-10-24
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Expires: 1991-02-05
Abstract
Abstract Part of the output of a push pull Clapp oscillator is rectified and smoothed to provide a voltage for stabilizing the oscillation amplitude, the control voltage being fed to the base of a transistor that acts as a variable resistance in a voltage divider connected to the bases of the push pull oscillator transistors, the controlled conduction of the voltage divider transistor acting to control the working points of the oscillator transistors so as to maintain a substantially constant oscillation amplitude.
Inventors
- 👤 Karl-Heinz Adler
- 👤 Helmut Domann Leonberg
- 👤 Johannes Locher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:49
CPC Classifications
H; H03; H03L; H03L5/00; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1231; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/30; H03B2200/00; H03B2200/0002; H03B2200/0006; H03B2200/006; H03B2200/0066
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
An amplitude stabilized oscillator comprising, in combination, a source of D.C. voltage; reference means defining a circuit reference point, one pole of said source being connected to said reference means; complementary first and second transistors having interconnected emitters, the collectors of said first and second transistors being respectively connected to the other pole of said source and to said reference means; a resonant circuit having at least two energy storing elements connected to each other to form a tap point, one of which elements connects said interconnected emitters and each of the bases of said transistors and the other of which elements is connected between the bases of said transistors and said reference means; and circuit means connected to said resonant circuit for obtaining a control voltage proportional to the amplitude of the oscillations and for applying said control voltage to said transistors to shift the working points thereof so as to maintain the oscillation amplitude subStantially constant.
Claim 2
Dependent Claim
158 words
An amplitude stabilized oscillator comprising, in combination, a source of D.C. voltage; reference means defining a circuit reference point, one pole of said source being connected to said reference means; complementary first and second transistors having interconnected emitters, the collectors of said first and second transistors being respectively connected to the other pole of said source and to said reference means; a resonant circuit having at least two energy storing elements connected to each other to form a tap point, one of which elements connects said interconnected emitters and each of the bases of said transistors and the other of which elements is connected between the bases of said transistors and said reference means; and circuit means connected to said resonant circuit for obtaining a control voltage proportional to the amplitude of the oscillations and for applying said control voltage to said transistors to shift the working points thereof so as to maintain the oscillation amplitude subStantially constant.
Claim 3
Dependent Claim
26 words
A combination as defined in claim 1, wherein said resonant circuit has a third energy storing element connected between said interconnected emitters and said reference means.
Claim 4
Dependent Claim
26 words
A combination as defined in claim 2, wherein said one and third energy storing elements are capacitors, and said other energy storing element is an inductor.
Claim 5
Dependent Claim
19 words
An oscillator as defined in claim 3, wherein the inductor of said resonant circuit is a motion pickup inductor.
Claim 6
Dependent Claim
61 words
A combination as defined in claim 3, wherein the oscillator is a Clapp oscillator and, wherein said resonant circuit further comprises a fourth energy storing element which is a capacitor connected in series with said inductor, whereby the combination of said one and third energy storing elements are arranged parallel to the combination of said other and fourth energy storing elements.
Claim 7
Dependent Claim
68 words
A combination as defined in claim 5, further comprising first and second diodes connected in series between the two bases and arranged to conduct current in the same direction as the collector-emitter paths of said transistors, said resonant circuit tap point being connected to the connection point between said diodes; a resistor connected between said interconnected emitters and a point joining said one and third energy storing elements.
Claim 8
Dependent Claim
43 words
A combination as defined in claim 6, further comprising a voltage divider comprising a first resistor connected between the base of said first transistor and said one pole, and second resistor connected between the base of said second transistor and said reference means.
Claim 9
Dependent Claim
74 words
A combination as defined in claim 7, wherein said voltage divider includes a third transistor having its emitter-collector path connected in series with said first and second resistors, the base of said third transistor being arranged to have applied thereto said control voltage so as to vary the conductivity of said third transistor in dependence on the value of said control voltage to thereby change the operating points of said first and second transistors.
Claim 10
Dependent Claim
22 words
A combination as defined in claim 8, wherein said voltage divider is connected between said reference means and said source of voltage.
Claim 11
Dependent Claim
57 words
An oscillator as defined in claim 8, wherein said circuit means includes rectifying means connected to said resonant circuit to rectify a portion of the output thereof, and voltage smoothing means connected to said rectifying means for smoothing the output thereof, the output of said voltage smoothing means being connected to the base of said third transistor.
References Cited (Backward Citations)
US2760070A
Cited
US3213390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |