Patent US3621282A successfully refreshed from Google Patents.
US3621282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sawtooth generator with a ramp-bias voltage comparator
Assignee: United States Department of the Navy
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Filing: 1970-03-26
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Granted: 1971-11-16
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Expires: 1990-03-26
Abstract
Abstract In a sawtooth generator the voltage ramp across a condenser is compared with a bias voltage source. The ramp and bias voltages are applied, respectively, to the two input terminals of a bistable comparator. When the two voltages are equal the comparator output voltage changes state suddenly to operate a first switch to discharge the condenser, and second switch to close a positive feedback circuit from the output to the input of the comparator to insure the reliable switching action. The result is a linear ramp repeated at regular intervals free of the vagaries of noise voltages in the system.
Inventors
- 👤 Charles H Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:25
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/501; H03K4/502
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
In a sawtooth generator having a storage condenser, a constant current source connected across said condenser for generating a linear voltage ramp, and switch means connected across said condenser for intermittently discharging said condenser, the combination comprising; a direct current bias source, a bistable comparator with two input circuits connected, respectively, to said condenser and to said direct current source, said comparator having an output circuit, said output circuit being connected to said switch means for operating said switch when the condenser ramp voltage exceeds a predetermined proportion of said bias, a voltage divider connected across said direct current source, a connection between a first point on said voltage divider and one input circuit of said comparator, and a diode being connected between said output circuit of the comparator and a second point on said voltage divider so that a difference in potential exists between said first and second points and a change in potential of the second point will change the potential at the first point.
Claim 2
Dependent Claim
167 words
In a sawtooth generator having a storage condenser, a constant current source connected across said condenser for generating a linear voltage ramp, and switch means connected across said condenser for intermittently discharging said condenser, the combination comprising; a direct current bias source, a bistable comparator with two input circuits connected, respectively, to said condenser and to said direct current source, said comparator having an output circuit, said output circuit being connected to said switch means for operating said switch when the condenser ramp voltage exceeds a predetermined proportion of said bias, a voltage divider connected across said direct current source, a connection between a first point on said voltage divider and one input circuit of said comparator, and a diode being connected between said output circuit of the comparator and a second point on said voltage divider so that a difference in potential exists between said first and second points and a change in potential of the second point will change the potential at the first point.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |