US4063194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-band frequency-controlled crystal oscillator
Assignee: Compagnie Electronique et de Piezoelectricite CEPE
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Filing: 1976-11-03
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Granted: 1977-12-13
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Expires: 1996-11-03
Abstract
Abstract An oscillator formed of an amplifier with a feedback loop containing two parallel connected crystals in series with a voltage variable capacitance. The two crystals have respective resonance frequencies above and below the limits of a wide band over which the oscillator frequency can be varied by a control voltage. Frequency versus control voltage linearity is improved by inductances inserted in parallel and in series, respectively, with the lower and higher frequency crystals.
Inventors
- 👤 Jacques Helle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:41
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/366; H03B5/368; H03B2200/00; H03B2200/003; H03B2200/004
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A wide-band frequency-controlled crystal oscillator, consisting, of an oscillating circuit in the form of a feedback loop, comprising an amplifier (A), a first element (C 2 ) having variable reactance in dependence upon electrical quantities or signals, and a second element oscillating with a high Q-factor, wherein said second element is formed by two piezoelectric crystals (X 1 ) (X 2 ) connected in parallel through a connecting capacitor (C l ), these two crystals having resonance frequencies respectively above the below those of said wide band.
Claim 2
Dependent Claim
87 words
A wide-band frequency-controlled crystal oscillator, consisting, of an oscillating circuit in the form of a feedback loop, comprising an amplifier (A), a first element (C 2 ) having variable reactance in dependence upon electrical quantities or signals, and a second element oscillating with a high Q-factor, wherein said second element is formed by two piezoelectric crystals (X 1 ) (X 2 ) connected in parallel through a connecting capacitor (C l ), these two crystals having resonance frequencies respectively above the below those of said wide band.
Claim 3
Dependent Claim
21 words
A wide-band oscillator as claimed in claim 1, wherein said first element is a diode of the electrically variable capacitance type.
Claim 4
Dependent Claim
23 words
A wide-band oscillator as claimed in claim 1, wherein the piezoelectric crystal of lower resonance frequency is connected in parallel with a self-inductance.
Claim 5
Dependent Claim
33 words
A wide-band oscillator as claimed in claim 1, wherein the piezoelectric crystal of higher resonance frequency is connected in series with a self-inductance, their common junction point being connected to said connecting capacitor.
References Cited (Backward Citations)
US3358244A
Cited
US3581240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |