US3824495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal oscillator, especially for clocks and watches
Assignee: Diehl Verwaltungs Stiftung
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Filing: 1972-09-13
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Granted: 1974-07-16
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Expires: 1992-09-13
Abstract
Abstract A crystal oscillator arrangement, especially for clocks and watches, in which an oscillator circuit has an input terminal connected to one side of a crystal while between the output side of the oscillator circuit and the other side of the crystal there is connected a decoupling stage that includes a nonlinear resistor. A pulse width varying component is connected in one of the oscillator circuit and decoupling stage. The arrangement provides for a phase shift from the input terminal of the oscillator circuit to the output side of the decoupling stage amounting to 360* or a whole multiple thereof. The arrangement provides for stabilization of the oscillator frequency over a wide range of variation of potential of the supply voltage source, usually, a battery.
Inventors
- 👤 E Gerum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:59
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/283; G; G04; G04F; G04F5/00; G04F5/04; G04F5/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
165 words
In a crystal controlled oscillator circuit; positive and negative voltage source terminals, an oscillator circuit having an input terminal and an output terminal and connected across said source terminals, a crystal stage having a first terminal connected to the input terminal of said oscillator and also having a second terminal, a decoupling stage connected between the output of said oscillator circuit and said second terminal of said crystal stage, said decoupling stage including a nonlinear impedance of which resistance increases over-proportionally during dropping of voltage which means that current decreases over-proportionally and a fixed impedance in series between said source terminals, the juncture of said impedances being connected to said second terminal of said crystal stage, said decoupling stage having a control terminal connected to the output terminal of said oscillator circuit with width of controlling impulse given off therefrom being adjustable, the phase shift from the input terminal of said oscillator to the juncture of said impedances being 360* or a whole multiple thereof.
Claim 2
Dependent Claim
165 words
In a crystal controlled oscillator circuit; positive and negative voltage source terminals, an oscillator circuit having an input terminal and an output terminal and connected across said source terminals, a crystal stage having a first terminal connected to the input terminal of said oscillator and also having a second terminal, a decoupling stage connected between the output of said oscillator circuit and said second terminal of said crystal stage, said decoupling stage including a nonlinear impedance of which resistance increases over-proportionally during dropping of voltage which means that current decreases over-proportionally and a fixed impedance in series between said source terminals, the juncture of said impedances being connected to said second terminal of said crystal stage, said decoupling stage having a control terminal connected to the output terminal of said oscillator circuit with width of controlling impulse given off therefrom being adjustable, the phase shift from the input terminal of said oscillator to the juncture of said impedances being 360* or a whole multiple thereof.
Claim 3
Dependent Claim
27 words
A circuit according to claim 1 in which said decoupling stage includes a transistor having emitter, collector, and base terminals, said base terminal forming said control terminal.
Claim 4
Dependent Claim
26 words
A circuit according to claim 1 in which said decoupling stage includes a diode having anode and cathode terminals, said anode terminal forming said control terminal.
Claim 5
Dependent Claim
16 words
A circuit according to claim 2 in which said transistor also serves as said nonlinear impedance.
Claim 6
Dependent Claim
16 words
A circuit according to claim 3 in which said diode also serves as said nonlinear impedance.
Claim 7
Dependent Claim
82 words
A circuit according to claim 1 in which said oscillator circuit comprises a two stage transistor amplifier, a resistor connecting the collector terminal of each transistor with one of said source terminals, the emitters of said transistors being connected to the other source terminal, the base of one transistor forming the said input terminal, the collector of said one transistor being connected to the base of the other of said transistors and the collector of said other transistor forming said output terminal.
Claim 8
Dependent Claim
58 words
A circuit according to claim 6 in which said decoupling stage comprises a third transistor having the collector connected to said one source terminal and the base connected to said output terminal, the emitter of said third transistor being connected to said second terminal of said crystal stage and through said fixed impedance to said other source terminal.
Claim 9
Dependent Claim
45 words
A circuit according to claim 6 in which said decoupling stage comprises a diode having the anode connected to said output terminal and the cathode side connected to said second terminal of said crystal stage and through said fixed impedance to said other source terminal.
Claim 10
Dependent Claim
23 words
A circuit according to claim 1 in which said oscillator circuit includes inverse feed back means for varying the pulse width developed thereby.
Claim 11
Dependent Claim
66 words
A circuit according to claim 6 in which said oscillator circuit includes pulse width varying negative feed back means in the form of an adjustable resistor interposed between the collector of said one transistor and the resistor connecting the collector to said one source terminal and a fixed resistor connecting the end of said adjustable resistor opposite said collector to the base of said one transistor.
Claim 12
Dependent Claim
23 words
A circuit according to claim 6 which includes an adjustable resistor between the emitter of said other transistor and said other source terminal.
Claim 13
Dependent Claim
24 words
A circuit according to claim 7 which includes a pulse width varying adjustable resistor in parallel with the collector-emitter path of said third transistor.
Claim 14
Dependent Claim
19 words
A circuit according to claim 8 which includes a pulse width varying adjustable resistor in parallel with said diode.
Claim 15
Dependent Claim
18 words
A circuit according to claim 1 which includes an adjustable impedance connected in parallel with said non-linear impedance.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |