US3792377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated quartz oscillator circuit
Assignee: Suwa Seikosha KK
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Filing: 1971-12-27
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Granted: 1974-02-12
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Expires: 1991-12-27
Abstract
Abstract A quartz oscillator having a four-terminal quartz vibrator, two of the four terminals being connected with a compensating device for compensating the temperature coefficient of the quartz vibrator frequency, the other two terminals being connected with an active circuit including at least one MOS transistor.
Inventors
- 👤 K Fujita
- 👤 H Mitsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:03
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/323; H03L; H03L1/00; H03L1/02; H03L1/028
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A quartz oscillator for electronic wrist watches comprising a four-terminal quartz vibrator; condenser means for compensating the temperature coefficient of said quartz vibrator frequency connected to a first and second of said four terminals of said quartz vibrator having a temperature sensitive electrolyte formed from TiO2BaO ferro-electric material such that the capacitance of said condenser means varies with temperature; frequency adjusting means including a first condenser means connected in series with said temperature compensating condenser means and a second condenser means connected in parallel with the series connection of said temperature compensating condenser means and said first condenser means and in series with said first and second terminals of said quartz vibrator; an active oscillation circuit including at least one MOS insulated gate field effect type transistor means, a third of said four terminals being connected to the gate electrode of said transistor means, the fourth of said terminals being connected to the source-drain path of said transistor means to define the output of said quartz oscillator.
Claim 2
Dependent Claim
167 words
A quartz oscillator for electronic wrist watches comprising a four-terminal quartz vibrator; condenser means for compensating the temperature coefficient of said quartz vibrator frequency connected to a first and second of said four terminals of said quartz vibrator having a temperature sensitive electrolyte formed from TiO2BaO ferro-electric material such that the capacitance of said condenser means varies with temperature; frequency adjusting means including a first condenser means connected in series with said temperature compensating condenser means and a second condenser means connected in parallel with the series connection of said temperature compensating condenser means and said first condenser means and in series with said first and second terminals of said quartz vibrator; an active oscillation circuit including at least one MOS insulated gate field effect type transistor means, a third of said four terminals being connected to the gate electrode of said transistor means, the fourth of said terminals being connected to the source-drain path of said transistor means to define the output of said quartz oscillator.
Claim 3
Dependent Claim
91 words
A quartz oscillator as recited in claim 1, wherein said active circuit includes a voltage source, first resistor means connected in series with the source-drain path of said transistor means across said voltage source; second and third resistor means connected in series with each other, said series connection being connected across said source of voltage, the gate electrode of said transistor means being conected to the junction between said second and third resistor means, said fourth terminal being connected to the junction between said first resistor means and said transistor means.
Claim 4
Dependent Claim
158 words
A quartz oscillator as recited in claim 1, wherein said active circuit includes a voltage source; second field effect transistor means having its source-drain path connected in series with the source-drain path of said first-mentioned transistor means, the series connection of said first and second transistor meanS being connected across said voltage source; and third and fourth field effect transistor means having their respective source-drain paths connected in seies, said series connected third and fourth transistor means being connected across said voltage source, each of said second, third and fourth transistor means having its respective gate electrode connected to its respective source-drain path, the gate electrode of said first-mentioned transistor means being connected to the junction between the source-drain paths of said third and fourth transistor means, said fourth terminal of said quartz vibrator being connected to the junction between the source-drain paths of said first-mentioned and second transistor means to define the output of said quartz oscillator.
Claim 5
Dependent Claim
20 words
A quartz oscillator as recited in claim 1, wherein said field effect transistor means is of the N-channel MOS type.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |