Patent US4812784A successfully refreshed from Google Patents.
US4812784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature stable voltage controlled oscillator with super linear wide frequency range
Assignee: International Business Machines Corp
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Filing: 1987-11-19
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Granted: 1989-03-14
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Expires: 2007-11-19
Abstract
Abstract A voltage controlled oscillator (VCO) having high temperature stability and wide voltage/frequency linearity is provided. The VCO comprises a multivibrator being switched by a bipolar type device, and temperature fluctuations of the bipolar type means are compensated by a FET current source coupled thereto. To provide a linear relationship of frequency vs. voltage over wide voltage range, the bipolar device is further regulated by a plurality of resistor and diode networks.
Inventors
- 👤 Paul W. Chung
- 👤 Paik Saber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:22
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2821; H03K3/01; H03K3/011
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A voltage controlled oscillator having high temperature stability, comprising: a bipolar type means for switching a multivibrator; a FET type current source coupled to said bipolar type switching means for compensating temperature fluctuations of said bipolar type means; resistive means coupled to said bipolar type means for regulating its current to provide a linear frequency vs. voltage relationship; and a plurality of diodes coupled to said resistive means for regulating the current through said resistive means.
Claim 2
Dependent Claim
76 words
A voltage controlled oscillator having high temperature stability, comprising: a bipolar type means for switching a multivibrator; a FET type current source coupled to said bipolar type switching means for compensating temperature fluctuations of said bipolar type means; resistive means coupled to said bipolar type means for regulating its current to provide a linear frequency vs. voltage relationship; and a plurality of diodes coupled to said resistive means for regulating the current through said resistive means.
Claim 3
Dependent Claim
24 words
A voltage controlled oscillator as in claim 1, further comprising a plurality of FET type loads for establishing the output voltage of the oscillator.
Claim 4
Dependent Claim
26 words
A voltage controlled oscillator as in claim 1, further comprising means for limiting the output voltage swing of the multivibrator for improving the switching speed thereof.
Claim 5
Dependent Claim
17 words
A voltage controlled oscillator as in claim 3, wherein said limiting means is a low threshold FET.
Claim 6
Dependent Claim
72 words
A voltage controlled oscillator having high temperature stability, comprising: a multivibrator comprising: a capacitor; a bipolar type means for charging said capacitor; a FET type current source for compensating temperature fluctuations of said bipolar type current source; resistive means coupled to said multivibrator for regulating said bipolar type charging means to provide a linear frequency vs. voltage relationship; and a plurality of diodes coupled to said resistive means for regulating current therethrough.
Claim 7
Dependent Claim
72 words
A voltage controlled oscillator having high temperature stability, comprising: a multivibrator comprising: a capacitor; a bipolar type means for charging said capacitor; a FET type current source for compensating temperature fluctuations of said bipolar type current source; resistive means coupled to said multivibrator for regulating said bipolar type charging means to provide a linear frequency vs. voltage relationship; and a plurality of diodes coupled to said resistive means for regulating current therethrough.
Claim 8
Dependent Claim
28 words
A voltage controlled oscillator as in claim 5, further comprising a plurality of FET type loads coupled to said multivibrator for establishing the output voltage of the oscillator.
Claim 9
Dependent Claim
33 words
A voltage controlled oscillator as in claim 5, further comprising clamping means coupled to said multivibrator for limiting the output voltage swing of said multivibrator to improve the switching speed of the oscillator.
Claim 10
Dependent Claim
17 words
A voltage controlled oscillator as in claim 7, wherein said clamping means is a low threshold FET.
Claim 11
Independent Claim
66 words
A method for generating temperature-stable, voltage-controllable oscillating signals, comprising the steps of: switching a multivibrator with a bipolar device; compensating temperature fluctuations of the bipolar current source with a FET current source; regulating said bipolar device by resistive means to provide a linear frequency vs. voltage relationship; and regulating current through said resistive means by connecting said resistive means in series with a plurality of diodes.
Claim 12
Independent Claim
66 words
A method for generating temperature-stable, voltage-controllable oscillating signals, comprising the steps of: switching a multivibrator with a bipolar device; compensating temperature fluctuations of the bipolar current source with a FET current source; regulating said bipolar device by resistive means to provide a linear frequency vs. voltage relationship; and regulating current through said resistive means by connecting said resistive means in series with a plurality of diodes.
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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |