US4096452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated crystal oscillator
Assignee: Sony Corp
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Filing: 1977-05-02
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Granted: 1978-06-20
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Expires: 1997-05-02
Abstract
Abstract A temperature-compensated crystal oscillator for correcting frequency variations caused by temperature changes by means of a differential amplifier which detects an unbalanced voltage in a bridge circuit including a temperature sensitive element for controlling a capacitance of a variable capacitor. The oscillator includes a circuit element having a temperature characteristic responsive to a temperature characteristic of the variable capacitor. The aforesaid circuit element is positioned in a current sink path of the differential amplifier.
Inventors
- 👤 Toshihiko Waku
- 👤 Hiroshi Shinohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:22
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/366; H03B5/368; H03L; H03L1/00; H03L1/02; H03L1/022; H03L1/023
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A temperature-compensated crystal oscillator, comprising: an oscillator circuit having a crystal and a variable capacitance; a differential amplifier comprising first and second transistors establishing a current sink path; connecting means for connecting said differential amplifier to said oscillator; bridge circuit means connected to said differential amplifier so as to supply a biasing voltage to said first and second transistors, said bridge circuit means including a first temperature sensitive element; and compensation means connected to said current sink path of said differential amplifier having a temperature characteristic which compensates a temperature characteristic of said variable capacitance.
Claim 2
Dependent Claim
95 words
A temperature-compensated crystal oscillator, comprising: an oscillator circuit having a crystal and a variable capacitance; a differential amplifier comprising first and second transistors establishing a current sink path; connecting means for connecting said differential amplifier to said oscillator; bridge circuit means connected to said differential amplifier so as to supply a biasing voltage to said first and second transistors, said bridge circuit means including a first temperature sensitive element; and compensation means connected to said current sink path of said differential amplifier having a temperature characteristic which compensates a temperature characteristic of said variable capacitance.
Claim 3
Dependent Claim
30 words
A temperature-compensated crystal oscillator as defined in claim 1, wherein said compensation means is a diode which is connected in a collector electrode path of said first and second transistors.
Claim 4
Dependent Claim
29 words
A temperature-compensated crystal oscillator as defined in claim 1, wherein said compensation means comprises diodes, a diode being connected to each collector electrode of said first and second transistors.
Claim 5
Dependent Claim
31 words
A temperature-compensated crystal oscillator as defined in claim 1, wherein said compensation means comprises diodes, a diode being connected to an emitter electrode of each of said first and second transistors.
Claim 6
Dependent Claim
52 words
A temperature-compensated crystal oscillator as defined in claim 1, wherein the compensation means comprises a third transistor which is connected in series with said differential amplifier, a fourth transistor whose base electrode connects to a base electrode of said third transistor, and a biasing circuit connected to said third and fourth transistors.
Claim 7
Dependent Claim
69 words
A temperature-compensated crystal oscillator as defined in claim 1, wherein said oscillator further comprises: an additional transistor whose collector and emitter paths are connected in parallel to said first and second transistors, and a biasing circuit connected to said additional transistor for supplying a biasing voltage to said additional transistor and having a second temperature sensitive element, said first and second temperature sensitive elements having different temperature characteristics, respectively.
Claim 8
Dependent Claim
31 words
A temperature-compensated crystal oscillator as defined in claim 6, wherein said first temperature sensitive element has a linear temperature characteristic, and said second temperature sensitive element has an exponential function characteristic.
Claim 9
Dependent Claim
20 words
A temperature-compensated crystal oscillator as defined in claim 1, in which said oscillator variable capacitance comprises a variable capacitance diode.
Claim 10
Dependent Claim
82 words
A temperature-compensated crystal oscillator, comprising: an oscillator circuit including a crystal and an electronically controlled variable capacitance means for varying a frequency of said oscillator circuit; a differential amplifier comprising first and second transistors connected to said variable capacitance means; bridge circuit means including a first temperature sensitive element connected to said differential amplifier for supplying a bias voltage thereto; and compensation means connected to said differential amplifier having a temperature characteristic related to a temperature characteristic of said variable capacitance means.
Claim 11
Dependent Claim
82 words
A temperature-compensated crystal oscillator, comprising: an oscillator circuit including a crystal and an electronically controlled variable capacitance means for varying a frequency of said oscillator circuit; a differential amplifier comprising first and second transistors connected to said variable capacitance means; bridge circuit means including a first temperature sensitive element connected to said differential amplifier for supplying a bias voltage thereto; and compensation means connected to said differential amplifier having a temperature characteristic related to a temperature characteristic of said variable capacitance means.
Claim 12
Dependent Claim
29 words
The oscillator of claim 9 in which said compensation means is connected in series with a collector-emitter path of at least one of the transistors in the differential amplifier.
Claim 13
Dependent Claim
18 words
The oscillator of claim 9 in which said compensation means is connected in parallel with said differential amplifier.
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |