Patent US3708694A successfully refreshed from Google Patents.
US3708694A
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Voltage limiter
Assignee: Vishay Siliconix Inc
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Filing: 1971-05-20
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Granted: 1973-01-02
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Expires: 1991-05-20
Abstract
Abstract A voltage limiter circuit and semiconductor structure employing field effect transistors and diodes adapted to be connected between a source of signal and the input of associated apparatus to provide over-voltage protection to the apparatus.
Inventors
- 👤 A Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:22
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/523; H03G; H03G11/00; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/693; H03K5/00; H03K5/01; H03K5/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A voltage limiter circuit having input and output terminals comprising a first field effect transistor having source, drain and gate electrodes with its source and drain electrodes connected in series between the input and output terminals, a second field effect transistor having source, drain and gate electrodes with its source and drain electrodes connected between the source or drain electrode of the first field effect transistor and the gate electrode of the first field effect transistor and its gate electrode to the gate electrode of the first field effect transistor, a diode having a direct current connection between the gate terminal of the first field effect transistor and a first voltage reference source.
Claim 2
Dependent Claim
113 words
A voltage limiter circuit having input and output terminals comprising a first field effect transistor having source, drain and gate electrodes with its source and drain electrodes connected in series between the input and output terminals, a second field effect transistor having source, drain and gate electrodes with its source and drain electrodes connected between the source or drain electrode of the first field effect transistor and the gate electrode of the first field effect transistor and its gate electrode to the gate electrode of the first field effect transistor, a diode having a direct current connection between the gate terminal of the first field effect transistor and a first voltage reference source.
Claim 3
Dependent Claim
31 words
A voltage limiter as in claim 1 including a second diode having a direct current connection between the drain of the first field effect transistor and a second reference voltage source.
Claim 4
Dependent Claim
33 words
A voltage limiter circuit as in claim 1 wherein said first and second field effect transistors and said diode are in the form of a semiconductor integrated circuit formed in a semiconductor substrate.
Claim 5
Dependent Claim
36 words
A voltage limiter circuit as in claim 2 wherein said first and second field effect transistors and said first and second diodes are in the form of a semiconductor integrated circuit formed in a semiconductor substrate.
Claim 6
Dependent Claim
25 words
A voltage limiter as in claim 3 wherein the gate of said first field effect transistor is connected to the substrate voltage by a diode.
Claim 7
Dependent Claim
25 words
A voltage limiter as in claim 4 wherein the gate of said first field effect transistor is connected to the substrate voltage by a diode.
References Cited (Backward Citations)
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US3369129A
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US3500062A
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US3609710A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |