US3694772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage control sawtooth oscillator with flyback time independent of frequency
Assignee: Information Storage Systems Inc
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Filing: 1971-04-12
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Granted: 1972-09-26
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Expires: 1991-04-12
Abstract
Abstract This invention involves an electrically frequency-variable oscillator of the type which can be adjusted to vary the characteristics of both the sawtooth wave and rectangular wave generated.
Inventors
- 👤 Frank J Sordello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:32
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1407; G11B20/1419; H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/501; H03K4/502
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
An oscillator comprising a charge storage means, a first circuit for charging said charge storage means, a second circuit for discharging said charge storage means, switching means in each of said circuits controlled to be alternately turned off and on relative to each other and at the frequency it is desired the oscillator operate, current control means operable to regulate the current flow in both circuits in a manner that an increase or decrease in current level in one circuit will be accompanied by a corresponding decrease or increase respectively in the other circuit, and means to detect the charge state of the charge storage means thereby to generate a sawtooth output signal of the oscillator having flyback and flydown characteristics.
Claim 2
Dependent Claim
121 words
An oscillator comprising a charge storage means, a first circuit for charging said charge storage means, a second circuit for discharging said charge storage means, switching means in each of said circuits controlled to be alternately turned off and on relative to each other and at the frequency it is desired the oscillator operate, current control means operable to regulate the current flow in both circuits in a manner that an increase or decrease in current level in one circuit will be accompanied by a corresponding decrease or increase respectively in the other circuit, and means to detect the charge state of the charge storage means thereby to generate a sawtooth output signal of the oscillator having flyback and flydown characteristics.
Claim 3
Dependent Claim
29 words
An oscillator as defined in claim 1 wherein said current control means comprises a transistor in each circuit having adjustable voltage bias means for regulating the current flow therethrough.
Claim 4
Dependent Claim
53 words
An oscillator as defined in claim 2 wherein said transistors in said circuits have a resistor connected between the respective emitters having a center tap adjustable such that the increase in resistance between the center tap and one emitter decreases the resistance between the tap and the other emitter by a comparable amount.
Claim 5
Dependent Claim
15 words
An oscillator as defined in claim 3 wherein said transistors have a common base connection.
Claim 6
Dependent Claim
36 words
An oscillator as defined in claim 4 including means to alter the base voltage of said transistors concurrently thereby to regulate the charging rate of the circuits and vary the frequency of oscillation of the oscillator.
Claim 7
Dependent Claim
15 words
An oscillator as defined in claim 1 wherein said charge storage means comprises a capacitor.
Claim 8
Dependent Claim
52 words
An oscillator as defined defined in claim 6 wherein said current control means comprises a transistor in each circuit having common base connections and means to vary the voltage at said transistor bases thereby to regulate the rates of charging and discharging concurrently to vary the frequency of operation of the oscillator.
Claim 9
Dependent Claim
73 words
An oscillator as defined in claim 7 including a resistor connected in series between the emitters of said transistors, said resistor having a single movable center tap connected to a source of potential such that movement of the tap in either direction will concurrently increase the current flow in one circuit while decreasing the current flow in the other circuit, thereby to vary the flyback and flydown characteristics of the sawtooth wave generated.
References Cited (Backward Citations)
US3376518A
Cited
US3559098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |