US3684981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic integrable crystal oscillator circuit
Assignee: TDK Micronas GmbH
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Filing: 1971-07-02
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Granted: 1972-08-15
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Expires: 1991-07-02
Abstract
Abstract This is a monolithic integrable crystal oscillator circuit wherein the quartz is connected between the emitter of two transistors. The emitter resistors are replaced by transistors connected as constant current sources. The collector resistors are replaced by complementary transistors.
Inventors
- 👤 Walter Kreitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:18
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/283
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
319 words
A crystal oscillator circuit including a monolithic integrable circuit, said monolithic circuit further includes first and second oscillator transistors of the same conductivity type, the base of said first transistor being connected to the collector of said second transistor and the base of said second transistor being connected to the collector of said first transistor, each of said first and second transistors having a respective first and second collector resistance and a respective first and second emitter resistance, a piezoelectric crystal connected between the respective emitter of each of said first and second transistors, a supply voltage source connected to the respective collector resistance of each of said first and second transistors and a source of constant potential, wherein the improvement comprises: said first and second collector resistance being formed by a respective first and second complementary transistor, the emitter of each of said first and second complementary transistors being connected to said supply voltage source, the base of said first complementary transistor being connected to the base of said first oscillator transistor and the base of said second complementary transistor being connected to the base of said second oscillator transistor, and the collector of said first complementary transistor being connected to the collector of said first oscillator transistor and the collector of said second complementary transistor being connected to the collector of said first oscillator transistor; and said first and second emitter resistance is formed by respective third and fourth transistors of the same conductivity type as that of said first and second oscillator transistors, the collector of said third transistor being connected to the emitter of said first oscillator transistor and the collector of said fourth transistor being connected to the emitter of said second oscillator transistor, the emitter of said third and fourth transistors being connected to circuit ground, and the base of said third and fourth transistors being connected to said source of constant potential.
Claim 2
Dependent Claim
319 words
A crystal oscillator circuit including a monolithic integrable circuit, said monolithic circuit further includes first and second oscillator transistors of the same conductivity type, the base of said first transistor being connected to the collector of said second transistor and the base of said second transistor being connected to the collector of said first transistor, each of said first and second transistors having a respective first and second collector resistance and a respective first and second emitter resistance, a piezoelectric crystal connected between the respective emitter of each of said first and second transistors, a supply voltage source connected to the respective collector resistance of each of said first and second transistors and a source of constant potential, wherein the improvement comprises: said first and second collector resistance being formed by a respective first and second complementary transistor, the emitter of each of said first and second complementary transistors being connected to said supply voltage source, the base of said first complementary transistor being connected to the base of said first oscillator transistor and the base of said second complementary transistor being connected to the base of said second oscillator transistor, and the collector of said first complementary transistor being connected to the collector of said first oscillator transistor and the collector of said second complementary transistor being connected to the collector of said first oscillator transistor; and said first and second emitter resistance is formed by respective third and fourth transistors of the same conductivity type as that of said first and second oscillator transistors, the collector of said third transistor being connected to the emitter of said first oscillator transistor and the collector of said fourth transistor being connected to the emitter of said second oscillator transistor, the emitter of said third and fourth transistors being connected to circuit ground, and the base of said third and fourth transistors being connected to said source of constant potential.
Claim 3
Dependent Claim
97 words
A crystal oscillator circuit according to claim 1, further comprising: fifth and sixth transistors of the same conductivity type as said first and second oscillator transistors, the collector of said fifth transistor being connected to said supply voltage source, the base of said fifth transistor being connected to the collector of said second oscillator transistor, the emitter of said fifth transistor being connected to the collector of said sixth transistor, the emitter of said sixth transistor being connected to the circuit ground, and the base of said sixth transistor being connected to said source of constant potential.
Claim 4
Dependent Claim
68 words
A crystal oscillator circuit according to claim 1, wherein said source of constant potential includes a diode and a resistor, one terminal of said resistor being connected to said supply voltage source, the other terminal of said resistor being connected to the anode of said diode, the cathode of said diode being connected to circuit ground, whereby the voltage across said diode represents said source of constant potential.
Claim 5
Dependent Claim
52 words
A crystal oscillator circuit according to claim 3, wherein said diode is formed by a seventh transistor of the same conductivity type as said first and second oscillator transistors, the emitter of said seventh transistor being connected to the circuit ground, and the base and collector of said seventh transistor being interconnected.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |