US3586874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated circuit periodic ramp generator
Assignee: General Electric Co
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Filing: 1969-08-13
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Granted: 1971-06-22
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Expires: 1989-08-13
Abstract
Abstract A temperature stable, low source impedance periodic ramp voltage generator capable of both positive and negative output voltage polarity, or only either one of these, is fabricated in large part as an integrated circuit. The generator comprises the combination of an operational amplifier used as an integrator and a bilateral or unilateral voltage-sensitive switching device, such as a silicon bilateral switch or a silicon unilateral switch, for periodically discharging the feedback capacitor of the integrating circuit.
Inventors
- 👤 Armand P Ferro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:44
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/80; H03K4/787; H03K4/83; H03K4/84
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A periodic ramp voltage generator using integrated circuits comprising the combination of: an integrating circuit for producing a ramp voltage in response to the application of a constant unidirectional input voltage and including an integrated circuit operational amplifier, an input resistor connected to one input terminal of said operational amplifier, and a feedback capacitor connected between said amplifier input terminal and the output terminal of said operational amplifier; and voltage-sensitive switching means connected across said feedback capacitor for periodically discharging said feedback capacitor upon charging to a predetermined voltage; wherein said voltage-sensitive switching means is a thyristor having a characteristic switching current and holding current, and the magnitude of said input resistor and the input voltage are selected to produce an output current for charging said feedback capacitor that is greater than the switching current and less than the holding current.
Claim 2
Dependent Claim
141 words
A periodic ramp voltage generator using integrated circuits comprising the combination of: an integrating circuit for producing a ramp voltage in response to the application of a constant unidirectional input voltage and including an integrated circuit operational amplifier, an input resistor connected to one input terminal of said operational amplifier, and a feedback capacitor connected between said amplifier input terminal and the output terminal of said operational amplifier; and voltage-sensitive switching means connected across said feedback capacitor for periodically discharging said feedback capacitor upon charging to a predetermined voltage; wherein said voltage-sensitive switching means is a thyristor having a characteristic switching current and holding current, and the magnitude of said input resistor and the input voltage are selected to produce an output current for charging said feedback capacitor that is greater than the switching current and less than the holding current.
Claim 3
Dependent Claim
14 words
A circuit according to claim 1 wherein said thyristor is a silicon unilateral switch.
Claim 4
Dependent Claim
14 words
A circuit according to claim 1 wherein said thyristor is a silicon bilateral switch.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |