US3581236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High stability oscillator
Assignee: Alcatel CIT SA
•
Filing: 1969-01-07
•
Granted: 1971-05-25
•
Expires: 1989-01-07
Abstract
Abstract A high stability oscillator having an amplifying channel including a phase adjusting member and a separate reaction channel including a resonant crystal and a temperature stabilizing circuit, the phase adjusting member being effective to compensate for aging of the crystal without affecting the temperature stabilization of the oscillator.
Inventors
- 👤 Leon Berman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:26
CPC Classifications
H; H03; H03L; H03L1/00; H03L1/02; H03L1/022; H03L1/023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A high stability oscillator comprising: first and second amplifiers each having an input circuit and an output circuit; a reactor channel including a temperature stabilized resonator circuit connected between the output circuit of said second amplifier and the input circuit of said first amplifier, said resonator circuit comprising a quartz crystal connected in series with a variable capacity diode, said variable capacity diode being connected to a temperature compensating network for controlling the capacitance of said diode, said network including at least one thermistor connected between a voltage source and said diode, whereby changes in the temperature of said thermistor introduce corresponding changes in the capacitance of said diode; and means for adjusting the frequency of the oscillator due to aging of said crystal, comprising a variable phase shifting circuit connected between the output of said first amplifier and the input of said second amplifier, whereby, in response to the aging of said crystal, the operation of said temperature stabilized resonator, in maintaining the frequency of said oscillator constant, may be insured through the adjustment of said variable phase shifting network.
Claim 2
Dependent Claim
181 words
A high stability oscillator comprising: first and second amplifiers each having an input circuit and an output circuit; a reactor channel including a temperature stabilized resonator circuit connected between the output circuit of said second amplifier and the input circuit of said first amplifier, said resonator circuit comprising a quartz crystal connected in series with a variable capacity diode, said variable capacity diode being connected to a temperature compensating network for controlling the capacitance of said diode, said network including at least one thermistor connected between a voltage source and said diode, whereby changes in the temperature of said thermistor introduce corresponding changes in the capacitance of said diode; and means for adjusting the frequency of the oscillator due to aging of said crystal, comprising a variable phase shifting circuit connected between the output of said first amplifier and the input of said second amplifier, whereby, in response to the aging of said crystal, the operation of said temperature stabilized resonator, in maintaining the frequency of said oscillator constant, may be insured through the adjustment of said variable phase shifting network.
Claim 3
Dependent Claim
69 words
A high stability oscillator, according to claim 1, wherein said first amplifier comprises a first transistor, the emitter of which is connected to said resonator circuit, and the collector of which is connected to said frequency adjusting means and wherein said second amplifier comprises a second transistor, the base of which is connected to said frequency adjusting means, and the emitter of which is connected to said resonator circuit.
Claim 4
Dependent Claim
52 words
A high stability oscillator, according to claim 1, wherein said temperature compensating network includes a pair of thermistors connected in series with a potentiometer, the variable arm of which is connected to one side of said diode, while the other side of said diode is connected directly to one of said thermistors.
Claim 5
Dependent Claim
22 words
An oscillator as claimed in claim 1, in which the phase changing element comprises an RC network equipped with an adjustable capacitor.
Claim 6
Dependent Claim
30 words
A high stability oscillator as defined in claim 1, wherein said first and second amplifiers are first and second transistors, respectively, said second transistor being connected in emitter folLower configuration.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |